MODULATION OF EARLY AUDITORY PROCESSING DURING SELECTIVE LISTENING TO RAPIDLY PRESENTED TONES
MODULATION OF EARLY AUDITORY PROCESSING DURING SELECTIVE LISTENING TO RAPIDLY PRESENTED TONES
复制标题
DOI：
10.1016/0013-4694(91)90136-r
复制
发表时间：
1991-09-01
期刊：
影响因子：
--
通讯作者：
HILLYARD, SA
中科院分区：
文献类型：
--
作者：
WOLDORFF, MG;HILLYARD, SA
通过对刺激条件和任务条件的优化，对被试进行了早期输入选择。受试者在一只耳朵里选择性地听快速呈现的音调序列，而在另一只耳朵里忽略不同音调的音调序列。在这两个实验中，在20到50毫秒之间，在erp的中央和额叶部位观察到参与通道音调点的阳性增强（“P20-50”）。在较长的潜伏期，注意的影响似乎包括几种外源性erp的振幅调制，包括中央N1波（60-150毫秒）和P2波（170-230毫秒）的子成分以及时间T复合体（80-150毫秒）。相比之下，注意力效应在前额叶由广泛的消极性组成，似乎主要是内源性的。采用一种信号处理技术（Adjar）来纠正在短刺激间隔（ISIs）连续刺激引起的相互重叠的erp畸变。证实了P20-50注意效应不是与以往erp差异重叠的结果。此外，该技术还分析了前一种刺激类型和ISI对注意敏感ERP的影响，这进一步支持了高度集中的选择性注意可以直接调节听觉ERP的外源成分的观点。此外，这些序列依赖的ERP调制与目标识别性能的变化是平行的。综上所述，这些结果为早期选择假说提供了强有力的支持，即在完整的知觉分析发生之前，注意可以选择性地偏向或限制刺激处理。
Two dichotic listening experiments were performed in which stimulus and task conditions were optimized for the early selection of inputs. Subjects listened selectively to sequences of rapidly presented tone pips in one ear while ignoring tone pips of a different pitch in the opposite ear. In both experiments, an enhanced positivity between 20 and 50 msec (the 'P20-50') was observed over central and frontal sites in the ERPs to the attended-channel tone pips. At longer latencies, the effects of attention appeared to include an amplitude modulation of several exogenous ERPs, including subcomponents of the central N1 (60-150 msec) and P2 (170-230 msec) waves and the temporal T complex (80-150 msec). In contrast, the attention effect prefrontally consisted of a broad negativity that appeared to be largely endogenous.A signal processing technique (Adjar) was employed to correct for distortion of mutually overlapping ERPs elicited by successive stimuli presented at short interstimulus intervals (ISIs). It was confirmed that the P20-50 attention effect was not the result of differential overlap from previous ERPs. In addition, this technique allowed an analysis to be made of the effects of the preceding stimulus type and ISI on the attention-sensitive ERPs, which provided further support for the view that highly focused selective attention can directly modulate exogenous components of the auditory ERP. Moreover, these sequence-dependent ERP modulations were paralleled by variations in target discrimination performance. Taken together, these results provide strong support for the early selection hypothesis that attention can serve to selectively bias or gate stimulus processing before full perceptual analysis has occurred.