Perlstein W M, Fiorito E, Simons R F, Graham F K
Department of Psychology, University of Delaware, Newark 19716.
Psychophysiology. 1993 Jul;30(4):347-58. doi: 10.1111/j.1469-8986.1993.tb02056.x.
Prepulse inhibition of the reflex blink by a weak stimulus shortly preceding a blink-eliciting stimulus has been described as a sensorimotor gating phenomenon that may protect processing of the first stimulus. To determine how a stimulus configuration that elicits prepulse inhibition also affects exogenous evoked potentials and perceived loudness of the paired stimuli, the three types of response were recorded simultaneously under four conditions: tone pairs of 75-110 dB and 75-75 dB and single control tones of each intensity. Two studies using different intrapair intervals found that blinks and exogenous potentials peaking after 50 ms were smaller for the second tone of pairs than for equal-intensity single tones. Pairing also reduced the loudness of 110-dB second tones, but the loudness of 75-dB first and second tones was unaffected or increased. These effects are discussed in terms of parallel processing of transient, unmodulated information in specific paths, steady-state modulated information in nonspecific paths, and a context-dependent effect on loudness judgments.
在引发眨眼的刺激之前不久，由微弱刺激产生的反射性眨眼的前脉冲抑制已被描述为一种感觉运动门控现象，它可能保护对第一个刺激的处理。为了确定引发前脉冲抑制的刺激配置如何影响外源性诱发电位以及配对刺激的感知响度，在四种条件下同时记录了三种类型的反应：75 - 110分贝和75 - 75分贝的音调对以及每种强度的单个对照音调。两项使用不同配对内间隔的研究发现，对于配对中的第二个音调，50毫秒后达到峰值的眨眼和外源性电位比同等强度的单个音调要小。配对还降低了110分贝第二个音调的响度，但75分贝第一个和第二个音调的响度未受影响或有所增加。这些效应是根据特定路径中瞬态、未调制信息的并行处理、非特定路径中稳态调制信息的并行处理以及对响度判断的上下文相关效应来讨论的。
