Ross S M, Ross L E
Am J Ment Defic. 1975 Jul;80(1):109-13.
Trace and delay classical eyelid conditioning procedures were used to investigate the relative contributions of conditioned stimulus input recruitment and trace decay processes to the trace conditioning deficit of severely and profoundly retarded subjects. The study included both trace and delay conditioning groups at interstimulus intervals of 500 and 950 msec. The conditioned stimulus durations were 50 msec for the 500-msec interstimulus interval trace group and 500 msec for the 950-msec interstimulus interval trace group. The "empty" interval between conditioned stimulus offset and the onset of the unconditioned stimulus was 450 msec for both trace conditioning groups. After 250 conditioning trials, there was no difference between the two trace groups, and both were significantly below the delay groups in final level of responding. These results suggest that stimulus trace decay rather than input recruitment, as manipulated by varying conditioned stimulus duration, accounts for the poor trace conditioning performance demonstrated by these subjects.
采用痕迹和延迟经典眼睑条件反射程序，来研究条件刺激输入募集和痕迹消退过程对重度和极重度智力迟钝受试者痕迹条件反射缺陷的相对贡献。该研究包括在刺激间隔为500毫秒和950毫秒时的痕迹和延迟条件反射组。对于500毫秒刺激间隔的痕迹组，条件刺激持续时间为50毫秒；对于950毫秒刺激间隔的痕迹组，条件刺激持续时间为500毫秒。两个痕迹条件反射组中，条件刺激偏移与无条件刺激开始之间的“空白”间隔均为450毫秒。经过250次条件反射试验后，两个痕迹组之间没有差异，并且在最终反应水平上均显著低于延迟组。这些结果表明，如通过改变条件刺激持续时间所操控的那样，刺激痕迹消退而非输入募集，是导致这些受试者痕迹条件反射表现不佳的原因。
