BRAIN-STEM FREQUENCY-FOLLOWING AND BEHAVIORAL-RESPONSES DURING SELECTIVE ATTENTION TO PURE-TONE AND MISSING FUNDAMENTAL STIMULI
BRAIN-STEM FREQUENCY-FOLLOWING AND BEHAVIORAL-RESPONSES DURING SELECTIVE ATTENTION TO PURE-TONE AND MISSING FUNDAMENTAL STIMULI
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DOI：
10.1016/0167-8760(95)00008-g
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发表时间：
1995-04-01
影响因子：
3
通讯作者：
DOAN, BQ
中科院分区：
文献类型：
--
作者：
GALBRAITH, GC;DOAN, BQ
对32名被试进行选择性注意任务的反应时间（RT）、分辨灵敏度（d’）和脑干频率跟随反应（FFR）进行了记录。听觉刺激是一个400赫兹的纯音和一个复杂的“缺失基本音”（MF），以二元方式呈现给不同的耳朵（通道）。在两个任务中，不频繁的目标刺激要么强度较低，要么持续时间较长。行为结果显示，在持续时间任务中表现出更好的表现（更快的RTs和更高的d'分数），并且对MF目标的整体检测更好。FFR注意效应在注意和忽略条件下的振幅不同。在两个任务中，参与通道的振幅对中频刺激和持续时间任务中的音调刺激都更大。然而，在高强度任务中，当参与频道时，对语气的反应是最低的，这可能反映了任务难度更高的某些特性。注意和忽略通道之间FFR振幅的差异表明，选择性注意可以改变人类脑干诱发反应。
Reaction time (RT), discrimination sensitivity (d'), and the brainstem frequency-following response (FFR) were recorded in 32 subjects performing a selective attention task. Auditory stimuli were a 400 Hz pure tone and a complex ''missing fundamental'' (MF) presented dichotically to separate ears (channels). In two tasks, infrequent target stimuli were either of lower intensity or greater duration than standard stimuli. Behavioral results showed consistently better performance (faster RTs and higher d' scores) in the duration task, and better overall detection of MF targets. FFR attention effects were evidenced by differing amplitudes in attend and ignore conditions. Amplitudes in the attended channel were larger to MF stimuli in both tasks, and to the tone stimulus in the duration task. Responses to tone in the intensity task, however, were lowest when the channel was attended, perhaps reflecting some property of greater task difficulty. The demonstration of FFR amplitude differences between attended and ignored channels suggests that selective attention can modify brainstem evoked responses in humans.