Attention and Voluntary Self-Control

Daily Bursts of Body-Related Self-Conscious Emotions Relate to Attention and Reaction Time in Adolescents

Body-related self-conscious emotions (e.g., shame, guilt, envy, and embarrassment), which are particularly salient in sport, are foundational to adolescents' attention and performance. Adolescents' (N = 72) self-conscious emotions and attention were examined using self-reported single-item measures across 4 days. After completing these measures, adolescents' reaction time was measured using a hand laterality judgment task. Data were analyzed using multilevel regression models. Controlling for age and gender, attention, and reaction times were regressed on body-related self-conscious emotions in separate multilevel models. Results indicate that, on the days that adolescents experience higher levels of body-related shame, envy, and embarrassment, they had more difficulty blocking out distracting thoughts. Further, higher levels of body-related embarrassment related to longer reaction times. This study is consistent with previous research indicating that body image may significantly impact motor performance. In addition to adolescents' performance, these results may have implications for adolescents' participation and enjoyment of sport experiences.

Momentary Dynamics Implicate Emotional Features in the ADHD Phenotype

Emotional dysregulation is increasingly recognized as important to the attention-deficit/hyperactivity disorder (ADHD) phenotype alongside inattention and hyperactivity-impulsivity. Studies of ADHD have relied primarily on trait-based conceptualizations that emphasize stability of symptoms across moderate developmental timescales (i.e., months to years). Trait-based conceptualizations provide a critical view but fail to account for short-term dynamic variations in the expression of ADHD symptoms and emotion. This leaves a gap in our understanding of the short-term variation in ADHD symptom expression and the dynamic relationships among ADHD symptoms and emotion. Here, we assessed caregiver report of ADHD symptoms and positive and negative emotion using ecological momentary approaches over 2 weeks in a sample of 36 children with and without ADHD between the ages of 7-12 years old. Between-person (RKF) and within-person (RC) reliability were estimated. Multilevel models tested specific covariation hypotheses between ADHD symptoms and emotion. Analyses confirmed that ADHD and emotion ratings were reliable as individual differences (i.e., between-person; RKF range 0.93-1.0) and moment-to-moment change (i.e., within-person; Rc range 0.66-0.88) measures. Multilevel models found little evidence for lagged effects between domains, but consistently identified concurrent expression of ADHD symptoms and emotions; inattention covaried most strongly with negative emotion and hyperactivity-impulsivity covaried most strongly with positive emotion. Results demonstrate the importance of complementing trait-level conceptualizations with assessment of momentary dynamics. Momentary assessment suggests important covariation of ADHD symptoms and emotion as part of the ADHD phenotype.

When ADHD knocks on the door - discourse theory as a frame to explore subject positions and mental wellbeing before diagnosis

PURPOSE

Attention deficit hyperactivity disorder (ADHD) is currently the most prevalent childhood psychiatric diagnosis. This article reports how 10 young adults in Norway positioned themselves before they were diagnosed with ADHD either during early childhood or adolescence. A central theme is how these subject-positions relate to societal norms and mental well-being.

METHOD

Individual interviews were conducted, and the transcriptions of the interviews were analysed according to discourse theory.

RESULT

Six central subject positions were identified which in turn related to two major positions: 1) failure with schoolwork and 2) struggle in social interaction. The findings indicated specific emotional and environmental needs and that individuals were confronted with societal norms related to the criteria for ADHD prior to and regardless of whether one had received a formal diagnosis.

CONCLUSION

We argue that analysing subject positions provides important knowledge regarding ADHD that is useful for individuals, parents, teachers, practitioners, policymakers, and helping professionals in the field of mental health and education when it comes to interventions that support children who possess different temperaments.

Body-related shame disrupts attentional focus over time in adolescence

INTRODUCTION

Body-related shame is a negative self-conscious emotion that is heightened during adolescence and is associated with several adverse outcomes. Of particular interest, and informed by Objectification Theory, body-related shame may impact attentional focus because the experience of this intense emotion may limit cognitive resources required to effectively engage in tasks. The purpose of the present study was to examine the association between body-related shame and attentional focus over time during adolescence.

METHODS

Adolescents (n = 160; Mage  ± SD = 16.05 ± 0.98; 80% self-identifying girls) completed an online survey in 2022 at baseline (Time 1) and 3 months later (Time 2). Stepwise regression was used to test the association between body-related shame and attentional focus, with weight perception included as a covariate.

RESULTS

The regression model demonstrated that higher body-related shame predicted poorer attentional focus 3 months later (β = -0.44, p < .001), after controlling for weight perception (14% variance explained in attention).

CONCLUSIONS

Findings support and extend theoretical tenets by highlighting the potential importance of targeting body-related shame to reduce the negative impact on attentional focus among adolescents.

The effect of mindfulness on social media addiction among Chinese college students: A serial mediation model

Introduction

The COVID-19 pandemic has exacerbated social media addiction (SMA), making it urgent to find effective interventions for social media addiction. Evidence has shown that mindfulness might be an effective intervention for social media addiction. However, psychological mechanisms by which mindfulness reduce social media use remain unclear. Here, we further addressed this issue to examine whether attentional control and fear of missing out (FOMO) mediate the relationship between mindfulness and SMA.

Methods

We recruited 446 college students from two universities in China and analyzed the data.

Results

The results suggest that there are mediation effects of attentional control and FOMO between mindfulness and SMA through 3 paths: path 1, mindfulness → attention control → SMA (-0.04); path 2, mindfulness → FOMO → SMA (-0.22); and path 3, mindfulness → attention control → FOMO → SMA (-0.05).

Discussion

Therefore, mindfulness-based interventions may be an effective way to alleviate social media addiction, especially mindfulness-based interventions targeting FOMO. At the end of the article, we also discussed the limitations of this study.

Intersection between social inequality and emotion regulation on emerging adult cannabis use

Emerging adulthood (EA; ages 18-25) is characterized by socioemotional and neurodevelopmental challenges. Cannabis is a widely used substance among EAs, and hazardous use may increase risk for sustained use patterns and related health consequences. Research shows differential increases in hazardous use by objective as well as subjective measures of social inequality, with more concerning trajectories for youth with greater experiences of social inequality. Learning how to flexibly monitor and modify emotions in proactive ways (i.e., emotion regulation) is a central developmental task navigated during the EA window. Challenges to and with emotion regulation processes can contribute to the emergence of mental health symptoms during EA, including hazardous cannabis use. In this perspective, we highlight emotion dysregulation and social inequality as two critical factors that interact to either buffer against or exacerbate cannabis use during the EA period, noting critical gaps in the literature that merit additional research. We recommend novel methods and longitudinal designs to help clarify how dynamic cognition-emotion interplay predicts trajectories of negative emotional experiences and cannabis use in EA.

Eye contact effect: The role of vagal regulation and reactivity, and self-regulation of attention

Eye contact is a crucial aspect of social interactions that may enhance an individual’s cognitive performance (i.e. the eye contact effect) or hinder it (i.e. face-to-face interference effect). In this paper, I focus on the influence of eye contact on cognitive performance in tasks engaging executive functions. I present a hypothesis as to why some individuals benefit from eye contact while others do not. I propose that the relations between eye contact and executive functioning are modulated by an individual’s autonomic regulation and reactivity and self-regulation of attention. In particular, I propose that individuals with more optimal autonomic regulation and reactivity, and more effective self-regulation of attention benefit from eye contact. Individuals who are less well regulated and over- or under-reactive and who do not employ effective strategies of self-regulation of attention may not benefit from eye contact and may perform better when eye contact is absent. I present some studies that justify the proposed hypothesis and point to a method that could be employed to test them. This approach could help to better understand the complex mechanisms underlying the individual differences in participant’s cognitive performance during tasks engaging executive functions.

Emotion-Cognition Interactions in Attention-Deficit/Hyperactivity Disorder: Increased Early Attention Capture and Weakened Attentional Control in Emotional Contexts

BACKGROUND

Emotion dysregulation is a key dimensional trait in psychopathology. It is of particular interest in attention-deficit/hyperactivity disorder (ADHD) because individual differences in emotion dysregulation predict impairment. Despite growing recognition of its importance, an understanding of emotional functioning in ADHD needs to be better integrated with the well-known nonemotional attentional impairments in the disorder. Here, we assess differences in early, reactive and later, regulatory attention to emotional stimuli, as well as how impairments in attentional control to nonemotional stimuli are affected under different emotional contexts.

METHODS

In all, 130 adolescents (nADHD = 61) completed an emotional go/no-go task while 32-channel electroencephalography data were recorded. Reaction time and accuracy were analyzed using the linear ballistic accumulator model.

RESULTS

The multimethod approach provided convergent evidence of increased early, reactive attention capture and overarousal (faster drift rates, increased P1) by positively valenced stimuli in ADHD, but no differences in later attention to emotional stimuli. Overarousal in positive-valence contexts appeared to exacerbate existing ADHD-related impairments in attentional control to nonemotional stimuli as well (reduced N2 amplitude). In contrast, positive-valence contexts facilitated attentional control to nonemotional stimuli for typically developing adolescents.

CONCLUSIONS

Results highlight the dynamic interaction of emotion with attentional control in ADHD. Distinguishing reactive and regulatory contributions to emotion dysregulation has been informative for clarifying mechanisms and spurring the development of novel interventions in other disorders. It can be informative in ADHD as well.

Food-Related Attentional Bias in Individuals with Normal Weight and Overweight: A Study with a Flicker Task

The primary purpose of the present study was to investigate attentional biases for food-related stimuli in individuals with overweight and normal weight using a flicker paradigm. Specifically, it was tested whether attention allocation processes differ between individuals with overweight and normal weight using transient changes of food-related and neutral pictures. Change detection latencies in objects of central interest (CI) or objects of marginal interest (MI) were measured as an index of attention allocation in a sample of fifty-three students with overweight/obesity and sixty students with normal weight during a flicker paradigm with neutral, hypercaloric and hypocaloric food pictures. Both groups of participants showed an attentional bias for food-related pictures as compared to neutral pictures. However, the bias was larger in individuals with overweight than in individuals with normal weight when changes were of marginal interest, suggesting a stronger avoidance of the food-related picture. This study showed that food-related stimuli influence attention allocation processes in both participants with overweight and normal weight. In particular, as compared to individuals with normal weight, those with overweight seem to be characterised by a stronger attentional avoidance of (or smaller attention maintenance on) food-related stimuli that could be considered as a voluntary strategy to resist food consumption.

Transactional relations between caregiving stress, executive functioning, and problem behavior from early childhood to early adolescence

Developmental psychopathologists face the difficult task of identifying the environmental conditions that may contribute to early childhood behavior problems. Highly stressed caregivers can exacerbate behavior problems, while children with behavior problems may make parenting more difficult and increase caregiver stress. Unknown is: (a) how these transactions originate, (b) whether they persist over time to contribute to the development of problem behavior and (c) what role resilience factors, such as child executive functioning, may play in mitigating the development of problem behavior. In the present study, transactional relations between caregiving stress, executive functioning, and behavior problems were examined in a sample of 1,388 children with prenatal drug exposures at three developmental time points: early childhood (birth to age 5), middle childhood (ages 6 to 9), and early adolescence (ages 10 to 13). Transactional relations differed between caregiving stress and internalizing versus externalizing behavior. Targeting executive functioning in evidence-based interventions for children with prenatal substance exposure who present with internalizing problems and treating caregiving psychopathology, depression, and parenting stress in early childhood may be particularly important for children presenting with internalizing behavior.

Heavy social drinkers score higher on implicit wanting and liking for alcohol than alcohol-dependent patients and light social drinkers

BACKGROUND AND OBJECTIVES

Automatic hedonic ("liking") and incentive ("wanting") processes are assumed to play an important role in addiction. Whereas some neurobiological theories suggest that these processes become dissociated when drug use develops into an addiction (i.e., "liking" becomes weaker, whereas "wanting" becomes exaggerated; e.g., Robinson & Berridge, 1993), other theories suggest that there is a linear relationship between these two processes (i.e., both "liking" and "wanting" increase equally; e.g., Koob & Le Moal, 1997). Our aim was to examine "wanting" and "liking" in three groups of participants: alcohol-dependent patients, heavy social drinkers, and light social drinkers.

METHODS

Participants performed two different single target implicit association tests (ST-IATs; e.g., Bluemke & Friese, 2007) and explicit ratings that were designed to measure "liking" and "wanting" for alcohol.

RESULTS

Our results are in sharp contrast with the theories of both Robinson and Berridge and Koob and Le Moal: heavy drinkers had higher scores than light drinkers and alcohol-dependent patients on both the wanting ST-IAT and the liking ST-IAT. There were no differences between alcohol-dependent patients and light drinkers. Explicit ratings mirrored these results.

LIMITATIONS

These findings suggest that our ST-IATs are not valid measures of "wanting" and "liking". Instead, they might assess more complex knowledge regarding participants' experiences and goals.

CONCLUSIONS

These findings suggest that the relationship between drug consumption and appetitive drug associations is not linear, highlighting the importance of testing both sub-clinical and clinical samples in future research.

Implicit attitudes towards smoking predict long-term relapse in abstinent smokers

RATIONALE

It has previously been argued that implicit attitudes toward substance-related cues drive addictive behavior. Nevertheless, it remains an open question whether behavioral markers of implicit attitude activation can be used to predict long-term relapse.

OBJECTIVES

The main objective of this study was to examine the relationship between implicit attitudes toward smoking-related cues and long-term relapse in abstaining smokers.

METHODS

Implicit attitudes toward smoking-related cues were assessed by means of the Implicit Association Test (IAT) and the evaluative priming task (EPT). Both measures were completed by a group of smokers who volunteered to quit smoking (patient group) and a group of nonsmokers (control group). Participants in the patient group completed these measures twice: once prior to smoking cessation and once after smoking cessation. Relapse was assessed by means of short telephone survey, 6 months after completion of the second test session.

RESULTS

EPT scores obtained prior to smoking cessation were related to long-term relapse and correlated with self-reported nicotine dependence as well as daily cigarette consumption. In contrast, none of the behavioral outcome measures were found to correlate with the IAT scores.

CONCLUSIONS

These findings corroborate the idea that implicit attitudes toward substance-related cues are critically involved in long-term relapse. A potential explanation for the divergent findings obtained with the IAT and EPT is provided.

Tradução e adaptação semântica do Questionário de Controle Atencional para o Contexto Brasileiro

A capacidade de controlar a atenção é uma tarefa complexa que demanda diferentes processos mentais. O presente estudo teve como objetivo traduzir e adaptar o Questionário de Controle Atencional para o Brasil. A pesquisa foi realizada com a ajuda de dois painéis multidisciplinares: um formado por profissionais de Psicologia Experimental e Neurociências responsáveis por auxiliar nas adaptações semânticas, e outro de especialistas em Psicologia da Atenção responsáveis por julgar os itens em três aspectos: clareza, coerência e compatibilidade semântica. O Coeficiente de Validade de Conteúdo foi utilizado para avaliar os itens a partir dos escores desses juízes. Dentre os 20 itens, apenas três não se mantiveram acima do critério de 0,80: itens 3, 16 e 20. Os resultados foram discutidos considerando os problemas enfrentados na adaptação do instrumento. Concluiu-se que o Questionário de Controle Atencional foi traduzido adequadamente e apresenta equivalência semântica com seu original estadunidense.

Limits of control: the effects of uncontrollability experiences on the efficiency of attentional control

Two experiments were conducted to explore the effects of experiencing uncontrollability on the efficiency of attentional control. The experience of uncontrollability was induced either by unsolvable tasks (Experiment 1) or by tasks in which non-contingent feedback was provided (Experiment 2). A version of the Attentional Network Test-Interactions with an additional measure of vigilance (ANTI-V) was used to evaluate the efficiency of the attentional networks (i.e., alerting, orienting, and executive). Results of both experiments revealed a decreased efficiency of executive attention in participants who experienced stable control deprivation but no negative effects in participants who were able to restore their sense of previously deprived control. Additionally, when participants were asked to perform unsolvable tasks and did not receive feedback (Experiment 1), detrimental effects on the orienting network and vigilance were observed. The motivational and cognitive mechanisms underlying the effects of various uncontrollability experiences on conflict resolution and attentional control are discussed.

Negative affectivity and EEG asymmetry interact to predict emotional interference on attention in early school-aged children

Negative affectivity (NA) is a broad construct that has been associated with the development of psychopathologies, such as anxiety, and with exaggerated attention to threatening stimuli. EEG asymmetry reflects biological individual differences in emotional reactivity that may underlie the association between NA and attention to threat. The present study included a sample of 31 five-seven year olds (M age in months=74.39, SD=6.57) to test the hypothesis that greater NA, combined with greater right anterior and posterior asymmetries, predicts increased attention interference following threat stimuli. Children completed an executive attention task which presented task-irrelevant threat (angry) and non-threat (neutral) faces prior to each trial. EEG asymmetry was measured at baseline for anterior, anterior-temporal and posterior scalp regions and child NA was measured via maternal report. As predicted, children showing greater NA and greater right anterior-temporal asymmetry showed more attention interference following angry faces. Additionally, two trend-level effects emerged: children showing greater NA and greater left anterior-temporal asymmetry showed less attention interference following angry faces, and children showing greater NA and greater left posterior asymmetry showed less attention interference, but only following neutral faces. Discussion focuses on the utility of using EEG asymmetry in the study of temperament, attentional biases, and the biological processes by which temperament confers risk for psychopathology.

The role of self-control strength in the development of state anxiety in test situations

Self-control strength may affect state anxiety because emotion regulation is impaired in individuals whose self-control strength has been temporarily depleted. Increases in state anxiety were expected to be larger for participants with depleted compared to nondepleted self-control strength, and trait test anxiety should predict increases in state anxiety more strongly if self-control strength is depleted. In a sample of 76 university students, trait test anxiety was assessed, self-control strength experimentally manipulated, and state anxiety measured before and after the announcement of a test. State anxiety increased after the announcement. Trait test anxiety predicted increases in state anxiety only in students with depleted self-control strength, suggesting that increased self-control strength may be useful for coping with anxiety.

On the predictive validity of automatically activated approach/avoidance tendencies in abstaining alcohol-dependent patients

BACKGROUND

Prominent addiction models posit that automatically activated approach/avoidance tendencies play a critical role in addiction. Nevertheless, only a limited number of studies have actually documented the relationship between relapse and automatically activated approach/avoidance tendencies. We compared automatically activated approach/avoidance tendencies towards alcohol in 40 abstaining alcohol-dependent patients and 40 controls. We also examined whether individual differences in automatically activated approach/avoidance tendencies towards alcohol are predictive of relapse in patients.

METHODS

A Relevant Stimulus Response Compatibility task was used to measure relative approach/avoidance tendencies. In one block of trials, participants were asked to approach alcohol-related pictures and to avoid alcohol-unrelated pictures (i.e., compatible block). In a second block of trials, participants were asked to approach alcohol-unrelated pictures and to move away from alcohol-related pictures (i.e., incompatible block). Patients were tested between 18 and 21 days after they quit drinking. Relapse was assessed 3 months after patients were discharged from the hospital.

RESULTS

Whereas abstaining alcohol-dependent patients were faster to respond to incompatible trials as compared to compatible trials, participants in the control group showed the exact opposite pattern. Within the patient group, the likelihood of relapse increased as participants were faster to respond to incompatible trials relative to compatible trials.

CONCLUSIONS

Unlike controls, abstaining alcohol-dependent patients revealed a relative avoidance bias rather than relative approach bias. Moreover, relapse rates were found to increase as the relative tendency to avoid alcohol increased. This finding suggests that an avoidance orientation towards alcohol can potentially be harmful in clinical samples.

ERP Responses to Facial Affect and Temperament Types in Eysenckian and Strelauvian Theories

Eysenck’s PEN and Strelau’s RTT theories are considered interrelated on the level of traits and translatable on the level of four ancient temperament types. However, they refer to different ways of regulation stimulation, by content (emotional and social) and by the formal (energetic and temporal) characteristics of activity, respectively. Thus, by indexing behavioral and cortical patterns of response, it was predicted that PEN- and RTT-relevant pairs of temperaments would be associated with specific attentional mechanisms. One week after administration of the FCB-TI and EPQ-R, subjects (260) performed the Emotional Go/No Go task while a 32-channel EEG was being recorded. They were instructed to respond to threatening, sad, or friendly faces, respectively, but not to any other facial expression. A range of ERP components responsive to facial stimuli were investigated. According to behavioral and cortical patterns of response, it was shown that PEN- and RTT-related pairs of temperament types were connected with effective functioning of the anterior and posterior attentional system, respectively. On the behavioral level, significant differences in attentional processing of facial affect were registered in PEN sanguines versus RTT sanguines and PEN melancholics versus RTT melancholics, while on the cortical level significant differences were registered in PEN melancholics versus RTT melancholics and PEN phlegmatics versus RTT phlegmatics. Given these results, the theoretical relations between the PEN and RTT – with particular respect to cognitive and cortical mechanisms underlying temperament types – are discussed.

Attention Problems Mediate the Association between Severity of Physical Abuse and Aggressive Behavior in a Sample of Maltreated Early Adolescents

Empirical evidence has accumulated documenting an association between childhood physical abuse and aggressive behavior. Relatively fewer studies have explored possible mediating mechanisms that may explain this association. The purpose of the current study was to examine whether caregiver- and youth-reported attention problems mediate the association between physical abuse severity and aggressive behavior. A sample of 240 maltreated early adolescents (ages 9-11) and their caregivers were interviewed within 14 months of being removed from the home. Results from multiple regression analyses indicated that caregiver- and youth-reported attention problems were partial mediators of the association between physical abuse severity and aggressive behavior. These associations were significant even after controlling for children's intellectual functioning, sex, age, and severity of other maltreatment types. Possible explanations for the detrimental impact of physical abuse on behavior are discussed, along with the implications of the current study's results for interventions aimed at reducing early adolescent aggressive behavior.

Self reported attentional control with the Attentional Control Scale: factor structure and relationship with symptoms of anxiety and depression

The Attentional Control Scale (ACS) is a self-report questionnaire that has been developed to measure individual differences in attentional control. Despite its fairly widespread use, little is known about the psychometric properties of the scale in adult samples. In the present study, factor structure of the ACS and its relationship with symptoms of anxiety and depression was investigated in a total sample of 728 Icelandic university students. Exploratory factor analysis in sample 1 (n=361), yielded two factors, labeled focusing and shifting. Confirmatory factor analysis in sample 2 (n=367) showed a reasonable fit of this two factor model. The two factors correlated strongly (0.73). The two subscales showed different predictive validity in a set of hierarchical regression analyses where the focusing subscale made a significant prediction of anxiety scores when depression scores were controlled for, and the shifting subscale significant prediction of depression scores when anxiety scores were controlled for. These findings are discussed in relation to previous studies on attentional and executive control in anxiety and depression.

An Education in Awareness: Self, Motivation, and Self-Regulated Learning in Contemplative Perspective

Consistent with the aims of this special issue, we present a systems perspective on self/identity, predicated on William James's classic distinction between I and Me, and use this perspective to explore conceptual relations between self/identity, motivation to learn, and self-regulated learning. We define the I self functionally in terms of the capacity for the conscious shifting and sustaining of awareness. The I is conceived of as that aspect of the self-system that affords the potential for the conscious and willful, rather than the non-conscious and automatic, motivation and regulation of behavior. We introduce contemplative education as a set of pedagogical practices designed to cultivate conscious awareness in an ethical-relational context in which the values of personal growth, learning, moral living, and caring for others are nurtured. We discuss the implications of contemplative education for the cultivation of conscious and willful forms of learning and living among students and educators alike.

Toward an integrative science of the person

To build a science of the person, the most basic question was, and remains, how can one identify and understand the psychological invariance that distinctively characterizes an individual and that underlies the variations in the thoughts, feelings, and actions that occur across contexts and over time? This question proved particularly difficult because of the discrepancies that soon emerged between the expressions of consistency that were expected and those that were found. The resulting dilemma became known as the classic "personality paradox": How can we reconcile our intuitions-and theories-about the invariance and stability of personality with the equally compelling empirical evidence for the variability of the person's behavior across diverse situations? Which is right: the intuitions or the research findings? In this chapter I review and discuss some of the advances made to answer this question since it was posed. These findings have allowed a resolution of the paradox, and provide the outlines for a conception of the underlying structure and dynamics of personality that seems to better account for the data.

Motivation and attention: Incongruent effects of feedback on the processing of valence

Four experiments investigated the relation between outcome-related motivational states and processes of automatic attention allocation. Experiments 1-3 analyzed influences of feedback on evaluative decisions. Words of opposite valence to the feedback were processed faster, indicating that it is easier to allocate attention to the valence of an affectively incongruent word. Experiment 4 replicated the incongruent effect with interference effects of word valence in a grammatical-categorization task, indicating that the effect reflects automatic attentional capture. In all experiments, incongruent effects of feedback emerged only in a situation involving an attentional shift between words that differed in valence.