CONDITIONED FEAR AND STARTLE MAGNITUDE - EFFECTS OF DIFFERENT FOOTSHOCK OR BACKSHOCK INTENSITIES USED IN TRAINING
CONDITIONED FEAR AND STARTLE MAGNITUDE - EFFECTS OF DIFFERENT FOOTSHOCK OR BACKSHOCK INTENSITIES USED IN TRAINING
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DOI：
10.1037//0097-7403.4.2.95
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发表时间：
1978-01-01
期刊：
影响因子：
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通讯作者：
ASTRACHAN, DI
中科院分区：
文献类型：
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作者：
DAVIS, M;ASTRACHAN, DI
各组大鼠（4）接受30次光电击配对，使用0.2、0.4、0.8或1.6 mA的足电击强度。一天后，通过在存在或不存在光CS [条件刺激]的情况下呈现音调来测试所有大鼠的惊吓。强化惊吓（轻色调与色调单独试验惊吓之间的差异）是非单调相关的训练中使用的冲击强度，在中间冲击水平的最大增强。当使用背部电击而不是足部电击时，也证明了类似的关系。对大鼠进行中度或高度电击训练，然后在1天后进行延长的预防测试。中度休克组表现出逐渐下降的增强惊吓灭绝。高休克组表现出非单调的灭绝曲线，增强逐渐增加，对灭绝的中间和消散之后。结果表明，声学惊吓承担一个倒U形的关系，恐惧和其他研究进行了讨论。
Groups of rats (4) received 30 light-shock pairings using footshock intensities of either .2, .4, .8 or 1.6 mA. One day later all rats were tested for startle by presenting tones in the presence or absence of the light CS [conditioned stimulus]. Potentiated startle (the difference between startle on light-tone vs tone-alone trials) was nonmonotonically related to the shock intensity used in training, with the greatest potentiation at intermediate shock levels. A similar relationship was demonstrated when backshocks instead of footshocks were used. Rats were trained with either a moderate or high shock and then given an extended extinction-test session 1 day later. The moderate-shock group showed a gradual decline in potentiated startle over extinction. The high-shock group showed a nonmonotonic extinction curve where potentiation progressively increased toward the middle of extinction and dissipated thereafter. Results suggest that acoustic startle bears an inverted U-shaped relationship to fear and are discussed in relation to other studies.