Anger and disgust shape judgments of social sanctions across cultures, especially in high individual autonomy societies

When someone violates a social norm, others may think that some sanction would be appropriate. We examine how the experience of emotions like anger and disgust relate to the judged appropriateness of sanctions, in a pre-registered analysis of data from a large-scale study in 56 societies. Across the world, we find that individuals who experience anger and disgust over a norm violation are more likely to endorse confrontation, ostracism and, to a smaller extent, gossip. Moreover, we find that the experience of anger is consistently the strongest predictor of judgments of confrontation, compared to other emotions. Although the link between state-based emotions and judgments may seem universal, its strength varies across countries. Aligned with theoretical predictions, this link is stronger in societies, and among individuals, that place higher value on individual autonomy. Thus, autonomy values may increase the role that emotions play in guiding judgments of social sanctions.

Changes in social norms during the early stages of the COVID-19 pandemic across 43 countries

The emergence of COVID-19 dramatically changed social behavior across societies and contexts. Here we study whether social norms also changed. Specifically, we study this question for cultural tightness (the degree to which societies generally have strong norms), specific social norms (e.g. stealing, hand washing), and norms about enforcement, using survey data from 30,431 respondents in 43 countries recorded before and in the early stages following the emergence of COVID-19. Using variation in disease intensity, we shed light on the mechanisms predicting changes in social norm measures. We find evidence that, after the emergence of the COVID-19 pandemic, hand washing norms increased while tightness and punishing frequency slightly decreased but observe no evidence for a robust change in most other norms. Thus, at least in the short term, our findings suggest that cultures are largely stable to pandemic threats except in those norms, hand washing in this case, that are perceived to be directly relevant to dealing with the collective threat.

Experimental evidence suggests intergroup relations are, by default, neutral rather than aggressive

The target article offers a game-theoretical analysis of primitive intergroup aggression (i.e., raiding) and discusses difficulties in achieving peace. We argue the analysis does not capture the actual strategy space, missing out "do-nothing." Experimental evidence robustly shows people prefer doing nothing against out-group members over cooperating with/attacking them. Thus, the target article overestimates the likelihood of intergroup aggression.

Rewarding More Is Better for Soliciting Help, Yet More So for Cash Than for Goods: Revisiting and Reframing the Tale of Two Markets With Replications and Extensions of Heyman and Ariely (2004)

Heyman and Ariely (2004) demonstrated that the expected effectiveness of soliciting help varied depending on the “market”, a money market represented by cash rewards versus a social market represented by goods as rewards. They showed that, as cash rewards increase, individuals expected others to be more willing to help, yet, when offering social goods as rewards such as candy, expected willingness to help was insensitive to rewards’ monetary worth. We conducted two pre-registered replication studies (total: N = 3302, MTurk/Prolific) of Study 1 in Heyman and Ariely (2004) and found support for one of their main claims that people are more sensitive to worth when the reward is cash than goods. However, the rewards’ monetary worth impacted expected willingness to help even in social markets, deviating from the original findings. Extensions further compared between-subject and within-subject designs, examined perceived affect (joy and regret), and added a new control condition. We concluded that higher compensation is generally perceived as better when soliciting help, yet more so for the money market cash rewards than for the social market goods rewards. All materials, data, and code are provided on https://osf.io/y9p7u/

Pathogen Threat and In-group Cooperation

Disease-causing parasites and pathogens play a pivotal role in intergroup behavior. Previous studies have suggested that the selection pressure posed by pathogen threat has resulted in in-group assortative sociality, including xenophobia and in-group favoritism. While the current literature has collated numerous studies on the former, strikingly, there has not been much research on the relationship between pathogen threat and in-group cooperation. Drawing upon prior studies on the function of the behavioral immune system (BIS), we argued that the BIS might facilitate cooperation with in-group members as a reactive behavioral immune response to pathogen threat. More specifically, we held that individuals might utilize cooperative behavior to ensure that they can receive social support when they have contracted an infectious disease. We reviewed existing findings pertaining to the potential role of the BIS in in-group cooperation and discussed directions for future studies.

Perceptions of the appropriate response to norm violation in 57 societies

Norm enforcement may be important for resolving conflicts and promoting cooperation. However, little is known about how preferred responses to norm violations vary across cultures and across domains. In a preregistered study of 57 countries (using convenience samples of 22,863 students and non-students), we measured perceptions of the appropriateness of various responses to a violation of a cooperative norm and to atypical social behaviors. Our findings highlight both cultural universals and cultural variation. We find a universal negative relation between appropriateness ratings of norm violations and appropriateness ratings of responses in the form of confrontation, social ostracism and gossip. Moreover, we find the country variation in the appropriateness of sanctions to be consistent across different norm violations but not across different sanctions. Specifically, in those countries where use of physical confrontation and social ostracism is rated as less appropriate, gossip is rated as more appropriate.

Little is known about people’s preferred responses to norm violations across countries. Here, in a study of 57 countries, the authors highlight cultural similarities and differences in people’s perception of the appropriateness of norm violations.

Optimal use of antihypertensive agents in management of bevacizumab-associated hypertension

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Background: Hypertension (HT) is the most common toxicity associated with bevacizumab (BV). Angiotensin converting enzyme inhibitors, calcium channel blockers (CCB), beta-blockers or diuretics are frequently chosen to control BV-associated HT. However, optimal use of these antihypertensive (AHT) agents for each grade of HT remains to be determined. Furthermore, the AHT agent to be used must be carefully chosen to avoid increasing risk for BV-associated cardiovascular adverse events.

Methods: Seventy-five consecutive patients with metastatic colorectal cancer who received first-line FOLFOX4 plus BV 5 mg/kg were included in the study. Treatment continued until progression of disease or unmanageable toxicity occurred. Blood pressure was measured prior to treatment in each cycle and graded using the NCI–CTC, version 3.0. The management protocol was as follows: 8-12 mg candesartan cilexetil (an angiotensin II receptor antagonist) as the first choice for grade 2 HT; 2.5 mg ≤ additional amlodipine besylate (a CCB) when grade 3 HT occurred; BV was discontinued if HT remained uncontrolled with use of both these agents. Stable blood pressure < 150/100mmHg during treatment was defined as manageable.

Results: Twenty patients (26.7%) had a history of HT. Grades 2-3 HT developed in 53 patients (70.7%) and grade 3 in 24 (32%). Median number of treatment cycles until onset of grades 2 and 3 HT was 3 and 4.5, respectively. Comparing patients with a history of HT to those without, the incidence of grade 3 was greater in the former (85 vs. 12.7%, respectively), and the median number of treatment cycles until onset of grade 3 was shorter (4 vs. 12 cycles, respectively); blood pressure was considered manageable in both groups (90 vs. 91%, respectively), and no difference in total duration of chemotherapy was observed. No AHT approach-related severe adverse events were observed.

Conclusions: Grade 3 HT was manageable during BV treatment, regardless of prior hypertensive history. However, to ensure improved survival, especially in patients with a history of HT, appropriate management is needed in BV-associated grade 3 HT. These data suggest that use of AHT agents is an effective and safe strategy in the management of BV-associated HT.

No significant financial relationships to disclose.

Effect of 8-MHz radiofrequency-capacitive regional hyperthermia with strong superficial cooling for unresectable or recurrent colorectal cancer

A well-known disadvantage of a radiofrequency-capacitive device for deep-seated tumours is preferential heating of the subcutaneous fat tissue. The authors previously developed the hyperthermia with their own external cooling unit and achieved strong superficial cooling, and reported its usefulness for the reduction of the preferential heating. The purpose of the present study was to evaluate the effect of hyperthermia with strong superficial cooling on the treatment results for unresectable or recurrent colorectal cancers. From 1986 to 2002, 44 patients with primary unresectable or locally recurrent colorectal cancer treated with thermoradiotherapy were analysed retrospectively. The patients with obesity as a subcutaneous fat thickness more than 3 cm, a high age or other serious complications did not undergo therapy. The results were compared between 17 cases with strong superficial cooling treated after 1997 (Group A) and 27 cases without strong superficial cooling treated before 1996 (Group B). Significant differences in thermometry data of T(max), T(ave) and T(min) were noted between Groups A (45.3, 44.4 and 43.6 degrees C, respectively) and B (42.9, 42.0 and 41.1 degrees C, respectively) (p<0.01). Complete response plus partial response rates were better for Group A than for Group B (59 versus 26%, p = 0.05). Multivariate analysis by logistic regression to evaluate the effects of certain factors on complete response plus partial response was strongly correlated with strong superficial cooling (p<0.05). The median survival times for overall survival were 24.3 months for Group A and 17.1 months for Group B (p<0.05). Eight-megahertz radiofrequency-capacitive regional hyperthermia with strong superficial cooling is potentially useful for improving treatment results in unresectable or recurrent colorectal cancers.

Protective effect against 17beta-estradiol on neuronal apoptosis in hippocampus tissue following transient ischemia/recirculation in mongolian gerbils via down-regulation of tissue transglutaminase activity

We analyzed the protective effect of 17beta-estradiol (17beta-ED) injection against delayed neuronal death in the hippocampus tissue of the brain in Mongolian gerbils after transient ischemia/recirculation treatment, especially in relation with bcl-2 gene expression and enzymatic activity changes of caspase-3 and tissue transglutaminase (tTGase). Daily intraperitoneal injection of 17beta-ED to the animal after the ischemia stimulated the expression of an apoptosis suppressor gene, bcl-2, in the hippocampal tissue for a week. The gradually increasing apoptotic enzyme activity of caspase-3 and increased number of TUNEL positive fragmented neuronal nuclei caused by ischemic attack in the gerbil brain were clearly suppressed by 17beta-ED administration. The reduced activity and enzyme protein of tTGase, a neurodegenerative marker of apoptosis in the hippocampus after ischemia, were also restored to nearly normal levels by 17beta-ED injection. These results suggest that daily 17beta-ED administration to the gerbil after transient ischemic insult with progressing neuronal deteriorative changes in hippocampus tissue can effectively prevent apoptotic changes through a molecular cascade involving gene expression regulation.

Radiotherapy with 8 MHz radiofrequency-capacitive regional hyperthermia for pain relief of unresectable and recurrent colorectal cancer

PURPOSE

The purpose of this study was to assess the pain relief in patients with unresectable and recurrent colorectal cancer treated with radiation plus 8 MHz radiofrequency-capacitive regional hyperthermia and to identify predictors of the good outcome.

METHODS

Between February 1986-May 2003, 41 patients with primarily unresectable and recurrent colorectal cancer that caused pain were treated with thermoradiotherapy at the hospital and retrospectively analysed. Radiotherapy was administered with a mean total radiation dose of 56 Gy. Hyperthermia was usually applied within 30 min after radiotherapy once or twice a week. For cooling of the skin surface, the overlay boluses were applied in addition to regular boluses. The external cooling unit has been used to reinforce the cooling ability of the overlay bolus and achieve strong surface cooling to reduce the preferential heating of the subcutaneous fat tissue and treat with more RF-output in 17 patients since January 1997.

RESULTS

Pain relief was obtained in 83% of the patients. Multi-variate analysis by logistic regression to evaluate the effects of certain factors on pain relief (complete response + good response) was strongly correlated with the presence of radiating pain to leg(s) (p < 0.05). The median follow-up was 18 months. The median duration of pain relief was 7.0 months. For the 27 patients in whom the tumour temperature was estimated, the median duration of pain relief was 14.6 months for the patients with a mean average tumour temperature of > 42.5 degrees C and 5.7 months for those of < 42.5 degrees C (p < 0.05). In the 18 patients with radiating pain to leg(s), use of strong superficial cooling and the higher numbers of hyperthermia treatments were better prognostic factors for the duration of pain relief (p < 0.01 and p < 0.05, respectively).

CONCLUSIONS

Radiotherapy with 8 MHz radiofrequency-capacitive regional hyperthermia provided an efficient, effective means on pain relief of treating unresectable and recurrent colorectal cancer. The duration of pain relief can be prolonged, if an adequate heating is achieved, especially in the patients with radiating pain to the leg(s).

Differential outcome effect in the horse

Three horses were trained with a discrimination task in which the color (blue or yellow) of a center panel signaled the correct (left or right) response (lever press). Reinforcing outcomes for the two correct color-position combinations (blue-left and yellow-right) were varied across phases. Discrimination performance was better when the combinations were differentially reinforced by two types of food (chopped carrot pieces and a solid food pellet) than when the combinations were randomly reinforced by these outcomes or when there was a common reinforcer for each of the correct combinations. However, the discrimination performance established by the differential outcome procedure was still 80% to 90% correct, and an analysis of two-trial sequences revealed that the stimulus color of the preceding trial interfered with discrimination performance on a given trial. Our demonstration of the differential outcome effect in the horse and its further analysis might contribute to more efficient control of equine behavior in the laboratory as well as in horse sports.

Proteome analysis of Oncorhynchus species during embryogenesis

To understand the molecular mechanisms underlying normal and abnormal development of two salmonids, masu salmon (Oncorhynchus masou) and rainbow trout (O. mykiss), we used two-dimensional (2-D) electrophoresis to construct a series of 2-D maps during the embryonic period. We identified all visible protein spots on the 2-D map by assigning numbers for masu salmon and rainbow trout, and we determined N-terminal sequences of proteins for one hundred of the spots, that appear at very high concentrations in the whole embryos of masu salmon and rainbow trout. We also characterized embryonic stages according to the periods of appearance of spots. Most of the N-terminal sequences were identical or at least highly similar to partial sequences reported for vitellogenin (Vtg) of O. mykiss. A potential proteolytic processing of Vtg for rainbow trout is discussed in relation to the time of appearance and relative position of Vtg fragments within the complete protein sequence.

Panel-touch behavior of horses established by an autoshaping procedure

Panel-touch behavior of 3 geldings was successfully established by a response-termination type of autoshaping procedure. An omission or negative contingency introduced after the training of an animal, however, decreased the response rate to a near-zero level.

[Situations and cognitive appraisals in 'agari' experiences: feature analyses of 'agari' experiences]

The purpose of this study was to examine the 'agari' experiences in everyday life. 'Agari' is a Japanese noun (the verb form is 'agaru'), referring to broad experiences including stage-fright, choking under pressure, social anxiety, and so on. Based upon the self-reports of 452 subjects, we constructed, in Study 1, a 52-items Features of 'Agari' Experience Questionnaire (FAEQ). In Study 2, another sample of 364 completed the FAEQ, and factor analysis was performed. The analysis found six primary factors: Self insufficiency, physical insufficiency, trembling, pressure, physiological response, and awareness of others. A second-order factor analysis was performed on them, and two factors emerged: Self-reflection and awareness of self-importance. It may be therefore concluded that looking at the self leads to an 'agari' experience. In addition, hierarchical cluster analysis divided twelve 'agari' situations into four clusters. The clusters were differentiated by two factors of FAEQ. It is suggested that eliciting situations and associated cognitive appraisals differentiated 'agari' experiences.

Effects of radiotherapy after hyperbaric oxygenation on malignant gliomas

The purpose of this non-randomized trial was to evaluate the efficacy of radiotherapy combined with hyperbaric oxygen (HBO) in patients with malignant glioma. Between 1987 and 1997, 29 patients in whom computerized tomography (CT) or magnetic resonance imaging (MRI) scans showed post-operative residual tumours were locally irradiated with nitrosourea-based chemotherapy. Treatments were consecutively combined with HBO at two institutions since 1991 and 1993. Fifteen patients were irradiated daily after HBO, and the periods of time from decompression to irradiation were within 15 and 30 min in 11 and four patients respectively. Fourteen other patients were treated without HBO. Tumour responses were assessed by CT or MRI scans and survival times were compared between the treated groups. In the HBO group, 11 of 15 patients (73%) showed > or = 50% tumour regression. All responders were irradiated within 15 min after decompression. In the non-HBO group, four of 14 patients (29%) showed tumour regression. The median survivals in patients with and without HBO were 24 and 12 months, respectively, and were significantly different (P < 0.05). No serious side-effects were observed in the HBO patients. In conclusion, irradiation after HBO seems to be a useful form of treatment for malignant gliomas, but irradiation should be administered immediately after decompression.

Individual variation and age dependency in the radiosensitivity of peripheral blood T-lymphocytes from normal donors

To investigate individual variation and age dependency in normal cell radiosensitivity, we measured the in vitro radiosensitivity of cultured peripheral blood T-lymphocytes derived from 56 healthy male blood donors. Dose-survival tests using colony formation assay were done with exponential growing T-cells (day 3, PHA-stimulated cells). 6-Thioguanine (6-TG)-resistant mutation assays at the hypoxanthine phosphoribosyl transferase (HPRT) locus were done with G0 phase T-cells (day 0, unstimulated cells). The mean inactivation dose (MID) computed by integration of the fitted survival curves was 1.25 +/- 0.23 Gy (mean +/- SD). The X-ray dose required to kill 90% of the cells (D10) was 2.81 +/- 0.51 Gy. The MID ranged from 0.82 to 1.86 Gy with a coefficient of variation (CV) of 18%. The induced mutation frequencies (MF) per 10(6) cells at 2 Gy of X-rays ranged from 9.10 to 54.80 with a mean +/- SD value of 24.63 +/- 12.51 and a CV of 51%. It appears that the radiosensitivity of cell killing and mutagenicity varies among individuals. Although the spontaneous MF at the HPRT locus increases with age, the induced MF after exposure to 2 or 4 Gy of X-rays was not associated with age. Moreover, there were no significant correlations between age and MID values or the other dose-survival parameters. The findings indicate there is significant inter-individual variation in cellular radiosensitivity, but that in human T-lymphocytes aging does not affect the cytotoxic and mutagenic effects of X-irradiation.

[Radiology diagnostic reporting system with local area networked personal computers]

We developed a radiology diagnostic reporting system compatible with a local area networked personal computer. A commercial package with a client-server database application was used for this customized program. With this system all diagnostic reports can be input from a client personal computer and saved on a server computer. This makes the retrieval of past diagnostic reports extremely easy. Use of this system in our department during the past 10 months, has simplified the management of diagnostic reports, reduced clerical work and saved storage space. It offers easy access for collecting clinical cases of interest since a database function for research purposes is also incorporated. This system using a personal computer and commercial application program is cheaper and more flexible than those that use a workstation base.

[Radiotherapy for carcinoma of the esophagus in aged patients]

One hundred fifty-four patients with esophageal carcinoma were treated with either irradiation alone or irradiation combined with surgery at the University of Occupational and Environmental Health Hospital between January 1980 and February 1992. The number of patients 75 years old and older was 25. In patients 74 years old and younger, the overall five-year survival rate by Kaplan-Meier method was 24.5%. The survival rate was best in the patients who were treated by a combination of irradiation and surgery. In patients 75 years old and older, the one-year survival rate was 59%, and the three-year rate was 20%. Aged patients had a tendency to be worse in performance status, and there was no correlation between treatment modality and survival time. We conclude that radiotherapy is useful for treating esophageal cancer in aged patients particularly when maintenance of the quality of life is considered.

Influence of PHA stimulation on the cytotoxicity and mutagenicity of X-rays and ethylnitrosourea in human peripheral blood T-lymphocytes

We investigated the effects of mitogenic stimulation on the cytotoxicity and mutagenicity of X-rays and ethylnitrosourea (ENU) in human peripheral blood lymphocytes using a cloning technique. Resistance to 6-thioguanine (TG) served as the genetic marker. Day 0 (unstimulated) lymphocytes were about two times more radiosensitive than day 3 (stimulated) lymphocytes to the cytotoxicity when compared for the D0 value (0.72 Gy vs. 1.54 Gy), and about five times more radiosensitive to its mutagenicity when compared for the frequency of TG-resistant cells following exposure to 4 Gy of X-rays (25.5 x 10(-6) vs. 126.0 x 10(-6). On the other hand, day 3 (stimulated) lymphocytes were about three times more sensitive to ENU with a D37 value of 1.03 mM compared with 2.82 mM for day 0 (unstimulated) lymphocytes, but as sensitive as day 0 lymphocytes to its mutagenic effect. These results indicate that the sensitivity of lymphocytes for cytotoxicity and mutagenicity is modified by mitogen stimulation, when lymphocytes are exposed to carcinogens or mutagens in vitro.

[Combined radiotherapy and hyperthermia for Pancoast tumor]

Thirteen patients with Pancoast tumor were treated with combined radiotherapy and hyperthermia from April 1987 to December 1992. Radiotherapy was performed using 10 MV X-rays, and all patients received a total dosage of 40-118 Gy with conventional fractionation. Hyperthermia was performed once or twice a week within 30 minutes after each irradiation, using 8 MHz RF capacitive heating equipment (Thermotron RF-8). Partial response, defined as 50% or more regression of the tumor, was observed in 7/13 (54%) patients, and the median survival time was 25.2 months. Results of 14 patients treated with irradiation alone from July 1980 to December 1992 were also evaluated, and were used as a historical control. The partial response was 4/14 (29%) and the median survival time was 7.3 months. Radiotherapy combined with hyperthermia is an effective modality for treating Pancoast tumors.

Low dose radiation-induced adaptive survival response in mouse spleen T-lymphocytes in vivo

Induction of an adaptive survival response in B6C3F1 mice exposed to whole-body irradiation by low doses of X-rays (priming exposure) then to high doses of X-rays (challenge exposure) was examined. The adaptive survival response was determined by comparing the cloning efficiency of low dose-irradiated spleen T-lymphocytes to that of unprimed controls. Maximal expression of the adaptive survival response induced by exposure to low doses of X-rays occurred 7 hours after the priming exposure. The optimal low dose range for the induction of the adaptive survival response was 0.05-0.1 Gy. Thus, low dose X-irradiation induces the adaptive response in spleen T-lymphocytes of B6C3F1 mice as assessed by survival. The duration of this response is short, and there is an optimal low dose range. The Dq value for the primed cells was somewhat larger than that for the unprimed ones. Low dose exposure may enhance the capacity of spleen cells for repair during priming.

Effects of strong magnetic fields on cell growth and radiation response of human T-lymphocytes in culture

Experiments were undertaken in order to verify whether or not a strong magnetic field would have any biological effects on the cell growth, viability and radiation response of mammalian cells. Magnetic field exposures were conducted using a superconducting magnet with freshly-isolated human peripheral blood T-lymphocytes maintained at their normal growing temperature of 37 degrees C. The static magnetic fields with intensities up to 6.3-tesla (T) exerted little influence on the cell growth and viability of actively-growing T-lymphocytes under normal cell-culture conditions. On the other hand, the T cells exposed to the magnetic fields (4 T-6.3 T) during PHA stimulation were inhibited in their cell growth when compared to controls. The effects of the magnetic fields with intensities up to 2 T on cell growth properties, however, were minimal in this system. Also, the radiosensitivity of T-lymphocytes previously exposed to the strong magnetic fields was more sensitive than that of control cells. These results suggest that exposure to a static magnetic field of 4 T or stronger might lead to physiological and growth abnormalities at the cellular level.

Strategy changes in human contingency judgments as a function of contingency tables

Judgment strategies of 169 undergraduate students on problems to judge the contingency between two binary events were identified by the method of rule-based analysis to clarify whether or not the strategies the subjects used would be affected by the concrete nature of the contingency table. Problems were constructed along two factors: total cell frequency and width of range of objective contingencies. Although the factor of total cell frequency had no effect on subjects' strategies, the number of subjects who changed strategies corresponding with problem instances increased when the objective contingencies were set closer to zero or when problems became more difficult. These results are discussed in the context of previous studies of this issue in the literature.

[Radiological diagnosis of splenic metastasis and its prevalence at autopsy]

CT and US findings of 7 cases of splenic metastases are described and the prevalence of splenic metastases at autopsy in 641 cases with malignant tumors were evaluated. Metastatic foci in spleen appeared mostly as poorly-defined low density masses on CT. Iodinated contrast material was administered in 2 cases, but no contrast enhancement was observed. US showed both hypoechoic and hyperechoic patterns. These appearances were nonspecific, but were similar to those of metastatic lesions in the liver which were often visible on CT associated with splenic metastases. At autopsy splenic metastases were found in 34 of 641 cases (5.3%). Gastric, colon, lung and ovarian cancers were most common primary tumors. However, the rate of splenic metastasis per tumor was highest in ovarian cancer (50.0%), followed by malignant melanoma (33.3%), colon cancer (16.2%) and gastric cancer (8.2%). Hepatoma which had the biggest number of autopsy cases in this series showed the lowest rate of splenic metastasis (0.8%).

Pancoast tumour treated with combined radiotherapy and hyperthermia--a preliminary study

Six patients with Pancoast (superior sulcus) tumours were treated with combined radiotherapy and hyperthermia from April 1986 to December 1989. Radiotherapy was performed using 10 MV X-ray, and all patients received total doses of 60-74 Gy, in five fractions per week, during 5.5-15 weeks. Hyperthermia was performed once or twice a week within 30 min after each irradiation, using 8 MHz RF capacitive heating equipment (Thermotron RF-8). Partial response, defined as 50% or more regression of the tumour, was observed in four of the six patients. Three patients are alive 30, 28, and 14 months after their treatments. Radiotherapy combined with hyperthermia appears to be a promising and effective means for treating Pancoast tumours.

Magnetic resonance imaging of intracranial venous angiomas

Magnetic resonance imagings (MRI) were made of intracranial venous angioma (six angiographically proved, four presumed). All draining veins were identified as a linear or a small round structure with a flow void. The stellate configuration was observed in seven of the ten patients. In two of the ten, the associated intraparenchymal hematoma was evident. Increased intensity of adjacent parenchyma on T2-weighted images was detected in four of ten patients, and a decreased intensity on the T1-weighted images was noted in three of eight. Thus, MRI is a pertinent diagnostic modality for evaluating intracranial venous angioma. Angiography does not seem to be required for confirmation in patients with typical MR findings.

Spontaneous abdominal aortic dissection: case report and review

An abdominal aortic dissection was incidentally imaged by contrast infusion computed tomography (CT) in a patient with an abdominal liposarcoma. Previously reported cases of spontaneous abdominal aortic dissection with radiographs are reviewed.

MR imaging of wallerian degeneration in the human brain stem after ictus

Magnetic resonance (MR) imaging of wallerian degeneration in the brain stem was studied in 30 hemiplegic patients within 12 months of ictus. As early as 25 days after the ictus, decreased signal intensities on proton-density(PD)-weighted images were observed in the brain stem ipsilaterally. This hypointensity gradually approached an isointense stage during 70-80 days after the ictus, abnormal intensities were not detected in any pulse sequence. We termed this phenomenon "Fogging effect of wallerian degeneration". In later stages, at least 81 days after the ictus, increased signal intensities on T2-weighted images, with or without decreased signal intensities on T1-weighted images, were observed in the brain stem, ipsilaterally. Finally, at least six months after the ictus, mild shrinkage of the ipsilateral brain stem was newly detected on the T1-weighted images. MR imaging has proven to be a sensitive diagnostic modality for evaluating wallerian degeneration in the brain stem.

[Computed tomography of thymic hyperplasia in older children]

Computed tomography (CT) findings of 8 cases of thymic hyperplasia in children aged 7 to 15 years were retrospectively analyzed in comparison to 8 cases of tumors of anterior mediastinum. All cases of thymic hyperplasia retained a somewhat triangular or arrowhead-like shape at least on one side while tumors showed bilateral globular contour with lobulated border. No compression of the air way or pleural fluid was observed in thymic hyperplasia. These CT features are useful for making a diagnosis of thymic hyperplasia when an older child is presented with an anterior mediastinal mass on chest X-ray.

[A comparison of win-shift and win-stay performance of rats in a radial arm maze]

The purpose of the present experiment was to compare the performance of rats in a win-shift task and a win-stay task in a radial arm maze. To this end, three experiments were conducted using a variety of procedures. In general, the win-shift task required the rats to choose the unvisited arms and the win-stay task required the rats to return the visited arms. In Experiment 1, a free-choice memory recognition procedure was used, and in Experiments 2 and 3, a forced-choice memory recognition procedure was used. All three experiments showed that in the win-shift task, rats rapidly learned the task and performed well whereas in the win-stay task, the rats consistently showed a chance-level performance despite of the prolonged training. In addition to these findings, when the tasks were reversed (i.e. from the win-shift to the win-stay, and vice versa), the rats still showed a response strategy previously adopted (Experiment 3). These findings seem to be important in considering the characteristics of spatial memory in rats.

Acquisition and maintenance of postshock response pattern in nondiscriminated avoidance with rats

Five experimentally naive albino rats were placed under a nondiscriminated lever-press avoidance schedule in which the delay to the next shock for responses after a shock was longer than the delay for responses after a response. Four rats acquired the postshock response pattern and maintained it for a prolonged period. The results revealed that postshock responding was under operant control and was not purely shock-elicited. It was suggested that the two kinds of response-shock interval, i.e. the shock-response-shock interval and the response-response-shock interval, could and should be independently controlled in nondiscriminated avoidance schedules.