Physiological Basis of Handling and Visual Search for objects

在7名受试者身上，研究了注视、反应准备和体感输入在视觉搜索和处理物体中的作用。比较了在常规范式和自我启动范式下，在重叠(持续呈现注视点)、间隙(注视点偏移量，靶点开始前0~400ms)和无注视任务中，对物体的快速眼跳的出现和频率。在后一种模式中，受试者在准备好后，触摸传感器，以0-400ms的延迟时间(目标开始延迟时间)点燃靶灯。当GAP范式与自我启动范式相结合，延迟时间为100ms(62%)时，快速眼跳(反应时间较短为80~130ms的眼跳)的出现频率最高。这一数值比正常的GAP任务高出20%。当体感刺激预先施加到靶的起效时间时，SRT降低。这些结果表明，被试的反应准备和体感输入作为警告信号，有可能在没有注视点偏移的情况下产生快速眼跳。

The role of fixation, the subjects' response preparedness and somatosensory input in visual search and handling for an object, were, explored in seven human subjects. The-occurrence, frequencies of the, express saccades to the object were compared in the overlap (continuous presentation of fixation point), gap (fixation point offset, 0-400 ms prior to target onset) and no-fixation tasks under the conventional and self-initiation paradigms. In the latter paradigm, the subjects, when ready, touched a sensor in order to ignite the target lamp with a delay time of 0-400 ms (target onset delay time). The highest occurrence frequency of express saccades (saccades with shorter reaction time of 80-130 ms) was obtained when the gap paradigm was combined with the self-initiation paradigm with a delay time of 100 ms (62%). The value was higher by 20% than in the normal gap task.. The SRTs were reduced when somatosensory stimuli were applied previously to the target, onset time. These results suggest that the subjects' response preparedness and somatosensory input given as a warning signal have a potentiality to produce express saccades without fixation point offset.