Tactile-spatial and cross-modal attention effects in the second somatosensory and 7b cortical areas of rhesus monkeys.
Tactile-spatial and cross-modal attention effects in the second somatosensory and 7b cortical areas of rhesus monkeys.
复制标题
恒河猴第二体感和 7b 皮质区域的触觉空间和跨模式注意效应。
DOI：
10.1080/08990229770971
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Whang,KC
中科院分区：
文献类型：
--
作者：
Burton,H;Sinclair,RJ;Hong,SY;PruettJr,JR;Whang,KC
这项研究分析了选择性注意任务期间第二体感 (SII) 和 7b 皮质区域的神经元反应。线索将注意力引向三种同时刺激之一：应用于双手镜像部位的振动触觉刺激或类似定时的听觉音调。对于提示刺激，两种刺激模式以相同的概率出现：恒定幅度正弦波或后者在试验中途叠加短暂幅度脉冲。无提示的刺激总是包含振幅脉冲。猴子通过适当奖励的上下脚踏板运动来证明提示位置是否存在振幅脉冲。提示位置和刺激模式以试验方式和伪随机方式变化。与提示同侧手或听觉刺激的试验相比，在至少一个时期内，181 个 SII 细胞中的 82 个 SII 细胞和 22 个区域 7b 细胞中的 13 个细胞对振动触觉刺激的平均放电率存在显着差异。主要是在包含振幅脉冲的时期之前的时间期间的放电率相对受到抑制，或者在这些脉冲期间和之后的活动增强。一般来说，不同的细胞在试验中早期表现出抑制，而后期表现出增强。对振幅脉冲之前和期间的放电率之间的比率的分析表明，振幅脉冲的诱发信号得到了改善。讨论认为注意力是一种在试验早期通过抑制这些信号来减少干扰的机制，或者选择性地增加提示通道中的响应幅度，特别是在幅度脉冲存在或不存在的时候。
This study analyzed neuronal responses in the second somatosensory (SII) and 7b cortical areas during a selective attention task. Cues directed attention to one of three simultaneous stimuli: vibrotactile stimuli applied to mirror sites on both hands or to a similarly timed auditory tone. Two stimulus patterns appeared with equal probability for the cued stimulus: a constant amplitude sinewave or the latter with a superimposed brief amplitude pulse midway in the trial. Uncued stimuli always contained amplitude pulses. Monkeys demonstrated whether an amplitude pulse at the cued location was present or absent by making appropriately rewarded up and down foot pedal movements. Cue location and stimulus pattern varied trial-wise and pseudo-randomly. Average firing rates to vibrotactile stimuli in 82 of 181 SII cells and 13 of 22 area 7b cells differed significantly during at least one epoch for trials cued to the contralateral hand when compared to trials cued to the ipsilateral hand or auditory stimulus. Predominant were relatively suppressed firing rates during times prior to the epoch containing the amplitude pulses or enhanced activity during and after these pulses. Generally, different cells showed suppression early vs enhancement later in a trial. Analyses of the ratio between firing rates before and during the amplitude pulses suggested improved evoked signals to the amplitude pulses. The discussion considers attention as a mechanism for reducing distractions, early in the trial through suppressing these signals, or for selectively increasing response magnitudes in the cued channel, especially around times when amplitude pulses were present or absent.