School of Psychology, University of Ottawa, Ottawa, ON, Canada K1N 6N5.
Clin Neurophysiol. 2011 Apr;122(4):738-47. doi: 10.1016/j.clinph.2010.10.036. Epub 2010 Nov 18.
To determine the extent to which the detection of a gap occurring in a long duration stimulus is affected by attention and conscious state.
The first experiment manipulated the extent to which active processing was required for the detection of a 20 ms gap in a 1.4 s duration pure tone stimulus. In a second experiment carried out during all-night sleep, a gap was presented in a 1.5 s noise segment having an intensity of 60 or 80 dB SPL.
The gap-elicited N1 did not significantly vary with the extent of active processing during wakefulness. N1 was not elicited by the gap during NREM sleep and was much reduced during REM sleep. A large P2 and later N350 was however observed, varying directly in amplitude with the intensity of the noise segment.
The operations required for the detection of a physical gap function early in processing, at a pre-conscious level.
Attention had relatively little effect on the detection of a gap as indexed by the amplitude of N1. Detection of a gap also appears to be made during sleep, as indexed by a large amplitude P2.
确定在长时间刺激中出现的间隙检测受到注意力和意识状态影响的程度。
第一个实验操纵了在持续 1.4 秒的纯音刺激中检测 20 毫秒间隙所需的主动处理程度。在整夜睡眠期间进行的第二个实验中，在强度为 60 或 80 dB SPL 的 1.5 秒噪声段中呈现一个间隙。
在觉醒期间，主动处理的程度对间隙诱发的 N1 没有显著影响。在 NREM 睡眠期间没有诱发 N1，而在 REM 睡眠期间则大大减少。然而，观察到了一个大的 P2 和后来的 N350，其幅度与噪声段的强度直接相关。
用于检测物理间隙的操作在处理的早期，在潜意识水平上进行。
注意力对 N1 幅度指示的间隙检测的影响相对较小。间隙的检测似乎也在睡眠期间进行，如大振幅 P2 所指示的那样。
Zotero 插件