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Affiliation(s)
- Robert Jaffard
- Laboratoire de Neurosciences Comportementales et Cognitives, Université de Bordeaux I, France
| | - Martine Meunier
- Laboratoire de Neurosciences Comportementales et Cognitives, Université de Bordeaux I, France
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Giuliano F, Clèment P. Pharmacology for the Treatment of Premature Ejaculation. Pharmacol Rev 2012; 64:621-44. [DOI: 10.1124/pr.111.004952] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Hannesson DK, Pollock MS, Howland JG, Mohapel P, Wallace AE, Corcoran ME. Amygdaloid kindling is anxiogenic but fails to alter object recognition or spatial working memory in rats. Epilepsy Behav 2008; 13:52-61. [PMID: 18337178 DOI: 10.1016/j.yebeh.2008.02.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Revised: 02/07/2008] [Accepted: 02/07/2008] [Indexed: 11/26/2022]
Abstract
Kindling in rats produces enduring behavioral changes that parallel the psychobehavioral disturbances frequently accompanying temporal lobe epilepsy. Some evidence suggests that the site of kindling is an important determinant of the type of behavioral changes observed following kindling, although this variable has not been systematically investigated. In the present experiments, the effects of amygdaloid kindling were assessed on a battery of behavioral tests we used previously to assess the effects of kindling in dorsal hippocampus or perirhinal cortex. Three generalized seizures were kindled with stimulation in or near the basolateral amygdala. One week later, rats were tested successively on measures of anxiety, activity, object recognition memory, and spatial working memory over a period of 3 weeks. Amygdaloid kindling produced increased anxiety, but spared all other behaviors assessed. This pattern of results is partially distinct from the previously described effects of perirhinal cortical kindling, which increases anxiety but also impairs object recognition memory, and is completely distinct from dorsal hippocampal kindling, which selectively increases activity and impairs spatial working memory. The observations suggest that kindling of distinct highly interconnected temporal lobe sites produces distinct patterns of behavioral comorbidity. The underlying mechanisms are thus most likely localized to intrinsic circuits at the site of seizure origination.
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Affiliation(s)
- D K Hannesson
- Department of Psychology and Neuroscience, Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, AB, Canada
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Kuo AG, Lee G, Disterhoft JF. Simultaneous training on two hippocampus-dependent tasks facilitates acquisition of trace eyeblink conditioning. Learn Mem 2006; 13:201-7. [PMID: 16585795 PMCID: PMC1409830 DOI: 10.1101/lm.98406] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A common cellular alteration, reduced post-burst afterhyperpolarization (AHP) in CA1 neurons, is associated with acquisition of the hippocampus-dependent tasks trace eyeblink conditioning and the Morris water maze. As a similar increase in excitability is correlated with these two learning paradigms, we sought to determine the interactive behavioral effects of training animals on both tasks by using either a consecutive or simultaneous training design. In the consecutive design, animals were trained first on either the trace eyeblink conditioning task for six sessions, followed by training on the water maze task for six sessions, or vice versa. The simultaneous design consisted of six or 11 training days; animals received one session/day of both trace eyeblink conditioning and water maze training. Separate groups were used for consecutive and simultaneous training. Animals trained on both tasks simultaneously were significantly facilitated in their ability to acquire the trace eyeblink conditioning task; no effect of simultaneous training was seen on the water maze task. No effect was seen on acquisition for either task when using the consecutive training design. Taken together, these findings provide insight into how the hippocampus processes information when animals learn multiple hippocampus-dependent tasks.
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Affiliation(s)
- Amy G Kuo
- Department of Physiology and Institute for Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA.
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Hannesson DK, Mohapel P, Corcoran ME. Dorsal hippocampal kindling selectively impairs spatial learning/short-term memory. Hippocampus 2002; 11:275-86. [PMID: 11769309 DOI: 10.1002/hipo.1042] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Kindling with electrical stimulation of the dorsal hippocampus has been shown to disrupt spatial task performance in rats. The present study investigated the specificity of this effect in terms of the possible contribution of nonmnemonic effects, the presence of a more general mnemonic deficit, and the involvement of learning/short-term memory and/or long-term memory processes. Rats were fully kindled with stimulation of the dorsal hippocampus and subsequently tested for acquisition, 7-day retention, and 28-day retention of a hidden platform (HP) location in the Morris water maze and an object discrimination problem in a modified water maze. To control for nonmnemonic behavioral impairments, testing on both tasks was preceded by training on visible platform control tasks. Kindling impaired acquisition of the HP location but spared performance on all other aspects of testing, indicating a specific impairment of spatial learning/short-term memory. These results suggest that epileptogenesis induced by hippocampal stimulation is indeed associated with a selective disruption of the mechanisms mediating spatial learning/short-term memory.
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Affiliation(s)
- D K Hannesson
- Department of Psychology and Neuropsychiatric Research Unit, University of Saskatchewan, Saskatoon, Canada
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6
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Abstract
Kindling produces enduring changes in the brain that are evident in not only enhanced susceptibility to seizure-evoking stimuli but also alterations in non-epileptic behaviors or functions. The present review examines the effects of kindling on one class of non-epileptic functions, learning and memory, and explores the dependence of these effects on variables such as the site of kindling, extent of kindling, and interval between kindling and testing. Current research shows that kindling is capable of altering performance on a variety of tasks including those that require spatial cognition, aversive conditioning, and object-related cognition and that non-mnemonic effects are unlikely, in at least some cases, to underlie these effects. Consideration of the conditions under which these effects are observed indicates a distinct relation between specific mnemonic effects and both the site and extent of kindling. Continued characterization of the mnemonic effects of kindling should provide a theoretical framework to guide discovery of their underlying mechanisms, which, in turn, may lead to rational therapy for mnemonic dysfunction associated with epilepsy and insights into the mechanisms of learning and memory.
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Affiliation(s)
- D K Hannesson
- Department of Psychology and Psychiatry, Neuropsychiatric Research Unit, University of Saskatchewan, 103 Wiggins Road, Sask, S7N 5E4, Saskatoon, Canada
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Port RL, Seybold KS. Manipulation of NMDA-receptor activity alters extinction of an instrumental response in rats. Physiol Behav 1998; 64:391-3. [PMID: 9748109 DOI: 10.1016/s0031-9384(98)00095-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The effects of pharmacologically manipulating N-methyl-D-aspartate(NMDA)-receptor activity were examined during extinction of an appetitive instrumental response in rats. After reaching acquisition criterion, subjects were treated with the antagonist dizocilpine maleate (MK801; 0.1 mg/kg), the agonist D-cycloserine (3 mg/kg), or vehicle-alone (control) and tested during a non-reinforced (extinction) session. The antagonist decreased the average number of responses occurring during the test session whereas the agonist increased the average number in contrast to controls. The effect on retention performance may be mediated by differential influence on the N-methyl-D-aspartate-dependent synaptic plasticity that occurs during associative learning. In conjunction with other studies, these data suggest that N-methyl-D-aspartate agonism may be an effective intervention for memory dysfunction.
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Affiliation(s)
- R L Port
- Department of Psychology, Slippery Rock University, PA 16057, USA
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Abstract
Structural change in the hippocampal formation has become popular as a proposed neurobiological substrate for schizophrenic disorders. It is postulated that behavioral plasticity in the form of long-term potentiation of hippocampal synaptic transmission is an attractive putative mechanism for the mediation of transient psychosis. Moreover, the disturbed hippocampal neuroarchitecture found in schizophrenic brain may be susceptible to potentiation and dysfunctional to the degree that delusions and hallucinations develop. Partial and selective blockade of the receptors mediating potentiation may prove to be an efficient means of preventing psychotic episodes and avoiding further damage to the involved network. Basic research, utilizing experimental models such as intraventricular kainic acid injection, may help to clarify the anatomical and physiological substrate of psychosis.
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Affiliation(s)
- R L Port
- Department of Psychology, Slippery Rock University, PA, USA
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Teskey GC, Valentine PA, Sainsbury RS, Trepel C. Evolution of afterdischarge and seizure characteristics during electrical kindling of the guinea-pig. Brain Res 1995; 672:137-47. [PMID: PMC7749734 DOI: 10.1016/0006-8993(94)01388-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Interspecies comparisons may help us understand the mechanisms which underlie brain plasticity. In this study, we examined the electrical kindling phenomenon in the amygdala, piriform and perirhinal regions of the guinea-pig. The changes in afterdischarge (AD) characteristics and behavioural seizures were assessed under different stimulation intervals and parameters as well as under reduced inhibitory neurotransmitter systems. We report that the guinea-pigs displayed a number of similarities with other species, such as the progressive increases in AD characteristics and seizure behaviours, but also a number of differences, such as the behavioural manifestations of the seizures, failing to reach a fully generalized tonic-clonic seizure and an apparent insensitivity to both low-frequency stimulation and reduced GABA and catecholamine levels.
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Affiliation(s)
- G C Teskey
- Department of Psychology, University of Calgary, Alberta, Canada
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McNamara RK, Kirkby RD, dePape GE, Skelton RW, Corcoran ME. Differential effects of kindling and kindled seizures on place learning in the Morris water maze. Hippocampus 1993; 3:149-52. [PMID: 8353602 DOI: 10.1002/hipo.450030207] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
There is some controversy about the role of long-term potentiation (LTP) in spatial learning. The authors have found that triggering generalized kindled seizures with stimulation of the perforant path disrupts spatial learning in the Morris water maze but that kindling per se does not affect spatial learning. It is suggested that abnormal electrical activity induced by high-frequency stimulation of the perforant path may have been responsible for the disruption of spatial learning previously attributed to LTP saturation.
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Affiliation(s)
- R K McNamara
- Department of Psychology, University of Victoria, British Columbia, Canada
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Abstract
The motivational consequences of kindling were examined in the conditioned place preference paradigm. In a distinctive environment, rats received stimulation of the amygdala that triggered afterdischarge (AD) alone or AD and generalized seizures. After 4 conditioning trials, preference for the conditioning environment or a control environment was measured. Amygdaloid ADs associated with nonconvulsive seizures (stage 0) produced a conditioned decrease in time spent in the initially preferred chamber by rats receiving stimulation there, and they produced a conditioned increase in time spent in the initially nonpreferred chamber by rats receiving stimulation there. These effects were not large, in that there was no overall mean shift from preference to avoidance, or vice versa; but they were reliable and significant. Similarly, stage 5 seizures produced a small and nonsignificant decrease in time spent in the conditioning chamber in which seizures were triggered. It appears that amygdaloid AD produces weak effects that are either reinforcing or punishing, depending on the behavioral baseline, and that generalized amygdaloid seizures are, at most, mildly punishing.
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Affiliation(s)
- M E Corcoran
- Department of Psychology, University of Victoria, B.C., Canada
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Robinson GB. Reversal learning of the rabbit nictitating membrane response following kindling-induced potentiation within the hippocampal dentate gyrus. Behav Brain Res 1992; 50:185-92. [PMID: 1333221 DOI: 10.1016/s0166-4328(05)80300-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The following experiment examined the effects of kindled seizures on reversal learning and the effects of both kindling and classical conditioning of the rabbit nictitating membrane on granule cell responsivity to perforant path input. Kindling resulted in significant potentiation of the population spike, the excitatory postsynaptic potential (EPSP) and the magnitude of twin pulse inhibition. Following kindling, rabbits were trained in a discrimination-reversal paradigm with either a tone or light paired with a corneal airpuff. Kindling did not affect acquisition of the initial discriminative response but did retard the rate of reversal learning. Kindling-induced potentiation, within dentate excitatory and inhibitory circuits, persisted for the duration of training. Thus, these results do not distinguish between the contribution of kindling-induced potentiation within dentate excitatory and inhibitory circuits to discrimination-reversal training. Spikes evoked during tone presentations were of reduced amplitude compared to spikes evoked either between trials or during light trials. The EPSP was not affected by stimulus conditions. In control rabbits, the magnitude of both the spike and EPSP increased across training. Training-related potentiation, in kindled rabbits, could not be separated from kindling-induced potentiation. These results demonstrate that an LTP-like effect of both the population spike and EPSP occurs with discrimination-reversal training.
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Affiliation(s)
- G B Robinson
- Department of Psychology, University of New Brunswick, Fredericton, Canada
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McNamara RK, Kirkby RD, dePape GE, Corcoran ME. Limbic seizures, but not kindling, reversibly impair place learning in the Morris water maze. Behav Brain Res 1992; 50:167-75. [PMID: 1449643 DOI: 10.1016/s0166-4328(05)80298-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We investigated the effects of kindling and kindled seizures in different limbic structures on place and cue learning in the Morris water maze. The triggering of seizures by stimulation of the perforant path, septum, or amygdala prior to daily training impaired place learning, but had little effect on visible platform training or swim speed. Seizures triggered by stimulation of the medial perforant path after daily training also impaired place learning. Conversely, place learning proceeded normally in rats tested 24 h after kindling triggered by stimulation of the perforant path, septum, or amygdala, indicating that kindling per se does not affect place learning. Each group was able to learn the location of a reversed platform when pretraining seizures were discontinued; and perforant path and septal kindled rats, but not amygdaloid kindled rats, were impaired at learning the location of a reversed platform when seizures were triggered before training. The results confirm previous reports that limbic seizures produce amnesia, but they contradict the finding that hippocampal kindling impairs learning on tasks sensitive to hippocampal lesions.
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Affiliation(s)
- R K McNamara
- Department of Psychology, University of Victoria, BC, Canada
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Peele DB, Gilbert ME. Functional dissociation of acute and persistent cognitive deficits accompanying amygdala-kindled seizures. Behav Brain Res 1992; 48:65-76. [PMID: 1622555 DOI: 10.1016/s0166-4328(05)80140-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effects of amygdala-kindled seizures on cognitive function were examined using long-delay flavor-aversion and passive-avoidance conditioning paradigms in rats. Experiments were conducted to compare the functional consequences of unilateral and bilateral kindled seizures (transient deficits) with those due to a kindling history only (persistent deficits). Animals with a history of unilateral or bilateral kindling demonstrated flavor-aversion conditioning that varied inversely with the delay separating saccharin (CS) and lithium (US). Unilateral stimulation during the CS-US interval produced an attenuation of flavor-aversion conditioning that was independent of delay value; bilateral stimulation eliminated conditioning all together. The effects of kindling and kindled seizures on passive-avoidance conditioning were functionally identical. Animals with a history of unilateral kindling demonstrated strong evidence of conditioning with no effect of posttraining seizures. In contrast, animals with a history of bilateral kindling were impaired in a passive-avoidance task. The impairment was evident in the presence or absence of seizure induction during training. Electrographic and behavioral indices of epileptiform activity produced by unilateral and bilateral stimulation failed to reveal any differences in seizure duration or severity. The results support the conclusion that cognitive disruption by amygdala-kindled seizures is task-dependent, does not show a temporal dependence, and cannot be explained on the basis of electrographic or behavioral measures of seizure severity alone.
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Affiliation(s)
- D B Peele
- Mantech Environmental Technology Incorporated, Research Triangle Park, NC 27709
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