Department of Neurology, Medical College of Wisconsin, 8701Watertown Plank Road, Milwaukee, WI 53226, USA.
J Cogn Neurosci. 2013 Sep;25(9):1553-62. doi: 10.1162/jocn_a_00416. Epub 2013 May 6.
In the visual modality, perceptual demand on a goal-directed task has been shown to modulate the extent to which irrelevant information can be disregarded at a sensory-perceptual stage of processing. In the auditory modality, the effect of perceptual demand on neural representations of task-irrelevant sounds is unclear. We compared simultaneous ERPs and fMRI responses associated with task-irrelevant sounds across parametrically modulated perceptual task demands in a dichotic-listening paradigm. Participants performed a signal detection task in one ear (Attend ear) while ignoring task-irrelevant syllable sounds in the other ear (Ignore ear). Results revealed modulation of syllable processing by auditory perceptual demand in an ROI in middle left superior temporal gyrus and in negative ERP activity 130-230 msec post stimulus onset. Increasing the perceptual demand in the Attend ear was associated with a reduced neural response in both fMRI and ERP to task-irrelevant sounds. These findings are in support of a selection model whereby ongoing perceptual demands modulate task-irrelevant sound processing in auditory cortex.
在视觉模态中，目标导向任务的知觉需求已被证明可以调节在感觉知觉加工阶段可以忽略多少不相关信息。在听觉模态中，知觉需求对任务无关声音的神经表示的影响尚不清楚。我们在双耳分听范式中比较了与任务无关声音相关的同时 ERP 和 fMRI 反应，这些反应与参数调制的知觉任务需求有关。参与者在一只耳朵（注意耳朵）中执行信号检测任务，同时忽略另一只耳朵（忽略耳朵）中的任务无关音节声音。结果表明，在左中颞上回的 ROI 中，听觉知觉需求对音节处理进行了调制，并且在刺激后 130-230 毫秒出现负 ERP 活动。在注意耳中增加知觉需求与 fMRI 和 ERP 对任务无关声音的神经反应减少有关。这些发现支持了一种选择模型，即持续的知觉需求调节听觉皮层中任务无关声音的处理。
