Rissling Anthony J, Dawson Michael E, Schell Anne M, Nuechterlein Keith H
Department of Psychology, University of Southern California, Los Angeles, California 90089-1061, USA.
Psychophysiology. 2005 Jul;42(4):440-6. doi: 10.1111/j.1469-8986.2005.00296.x.
Startle eyeblink modification was measured during a continuous performance test (CPT) with either clearly focused stimuli or visually degraded stimuli to measure the effects of early perceptual processing demands on startle modification. A startling noise was presented either 120, 240, or 1200 ms following target and nontarget CPT stimuli. In the degraded stimulus CPT, startle inhibition at 240 ms was greater following targets than nontargets and was as great during targets at 240 ms as at 120 ms, whereas in the clearly focused CPT, inhibition declined significantly from 120 to 240 ms. The results indicate that maximum prepulse inhibition is extended in time when the task involves discrimination of degraded visual stimuli and when early perceptual processing demands are high. At 1200 ms, targets and nontargets produced nondifferential inhibition during both CPTs, suggesting that modality-specific attention occurred equally for the two tasks.
在持续操作测试（CPT）期间，通过清晰聚焦刺激或视觉退化刺激来测量惊吓眨眼修正，以评估早期感知处理需求对惊吓修正的影响。在目标和非目标CPT刺激之后120、240或1200毫秒呈现一声惊吓噪声。在退化刺激CPT中，目标出现后240毫秒时的惊吓抑制比非目标出现后更大，且目标出现后240毫秒时的惊吓抑制与120毫秒时一样大，而在清晰聚焦CPT中，抑制从120毫秒到240毫秒显著下降。结果表明，当任务涉及辨别退化视觉刺激且早期感知处理需求较高时，最大前脉冲抑制在时间上会延长。在1200毫秒时，两种CPT中目标和非目标产生的抑制无差异，表明两种任务的模态特异性注意力均等。
