تسهیل یادگیری ترس از تهدید ترس و اضطراب قبلی
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|131020||2018||26 صفحه PDF||سفارش دهید|
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Behavioural Brain Research, Volume 347, 16 July 2018, Pages 61-68
Classical fear conditioning is perhaps the premier model system used to study the neurobiological basis of memory formation. Prior work has resulted in a good understanding of both the molecular mechanisms and neural circuits supporting this form of learning. However, much of what is known about these mechanisms comes from studies in which fear memory is acquired using a single, isolated training session. Given that we cannot divorce the acquisition of new information from the backdrop on which it occurs, studies are needed to determine how the acquisition of fear memory is affected by other learning events. Here, we used rats to describe the time course by which auditory fear conditioning can facilitate learning to a different fear learning event, which alone is insufficient to support long-term fear memory. First, we replicated previous findings showing that although a single trial of light and shock produces little evidence of memory, two identical trials spaced 60â¯min or 24â¯h apart support long-term memory. Next, we report that a typical auditory fear conditioning session facilitated memory formation when rats were subsequently exposed to a single trial of light and shock 60â¯min or 24â¯h, but not 4â¯min, later. Finally, we show that learning can be enhanced retroactively if auditory fear conditioning occurs 60â¯min, but not 24â¯h, after a single light-shock pairing. These data demonstrate that a weak fear conditioning trial can be enhanced by prior and subsequent fear conditioning depending on the timing between training events.