Abstract
According to current concepts, memory can be disrupted by administration of protein synthesis inhibitors over a relatively short time period before and after learning. However, data have been obtained indicating that protein synthesis inhibitors can induce amnesia when given long after learning if administration is performed in reminder conditions, i.e., when the animal is presented with one of the environmental components which previously formed the learning situation. The aim of the present work was to confirm the possibility of inducing memory disruption in chicks at late post–learning stages by administering the protein synthesis inhibitor cycloheximide in association with a reminder procedure. Day–old chicks were trained to perform a standard passive avoidance task. Chicks were given cycloheximide (20 μg, intracerebrally) 5 min before the reminder procedure, which was performed 2, 24, or 48 h after training. Testing was conducted 0.5, 1, 3, 24, and 48 h after the reminder. Administration of cycloheximide in association with the reminder procedure induced the development of temporary amnesia, whose duration gradually decreased as the interval between training and reminding increased. These data led to the hypothesis that a memory reactivated by a reminder undergoes a process of reorganization and reconsolidation, which depends on the synthesis of new proteins. The quenching of the ability of protein synthesis inhibition during the reminder to disrupt memory demonstrates the existence of a gradual process resulting in consolidation of memory between 2 and 48 h of learning.
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Litvin, O.O., Anokhin, K.V. Mechanisms of Memory Reorganization during Retrieval of Acquired Behavioral Experience in Chicks: the Effects of Protein Synthesis Inhibition in the Brain. Neurosci Behav Physiol 30, 671–678 (2000). https://doi.org/10.1023/A:1026698700139
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DOI: https://doi.org/10.1023/A:1026698700139