Permanence of Retrograde Amnesia Produced by Electroconvulsive Shock
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The permanence of retrograde amnesia produced for a single training trial by a single electroconvulsive shock was studied. No recovery from amnesia was found with either single or repeated retention tests. Amnesic effects were found to be permanent with retention intervals as long as 1 month.Keywords:
Retrograde amnesia
Retrograde amnesia
Intensity
Avoidance learning
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It has been demonstrated that placing rats in a sensory-restricted environment during the electronconvulsive shock- (ECS) retention interval following 1-trial appetitive learning will prevent or eliminate ECS-produced retrograde amnesia. The first study replicated this finding with a 1-trial aversive learning task, indicating that this effect is not task specific. The second study attempted to determine whether illumination or the restricted environment was the crucial factor in this penomenon. Rats placed in the light during the ECS-retention interval, whether restricted or in the colony, demonstrated retrograde amnesia after ECS. However, rats left in the dark during this interval demonstrated little, if any, retention deficit particularly if this condition was combined with sensory isolation. These studies further indicate that manipulation of the general environment of the animal after ECS can alter ECS-produced retention losses.
Retrograde amnesia
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Retrograde amnesia
Memory disorder
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Retrograde amnesia
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The permanence of retrograde amnesia produced for a single training trial by a single electroconvulsive shock was studied. No recovery from amnesia was found with either single or repeated retention tests. Amnesic effects were found to be permanent with retention intervals as long as 1 month.
Retrograde amnesia
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Citations (101)
Retrograde amnesia
Avoidance learning
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Retrograde amnesia
Intensity
Avoidance learning
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The amnesic and convulsive effects of experimental cerebral concussion were observed in rats. Marked convulsions were associated with only partial retrograde amnesia in one trial passive avoidance when the head injury was given less than 7 seconds after learning the task. These results are compared with the complete retrograde amnesia associated with a lesser severity of convulsions produced by electroconvulsive shock in rats under identical learning situations.
Retrograde amnesia
Convulsion
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The administration of electroconvulsive shock after foot shock in a passive avoidance learning situation produced retrograde amnesia if electroconvulsive shock occurred within 20 sec. of the foot shock. If the time interval between foot shock and electroconvulsive shock was 20 sec. or longer, retrograde amnesia was not observed. No behavioral differences were observed between two inbred strains of mice, the DBA/2J and the C57BL/6J.
Retrograde amnesia
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