Physiological Basis of Handling and Visual Search for objects

本研究探讨了注视、被试的反应准备和体感输入在视觉搜索和处理中的作用。在常规范式和自我启动范式下，比较了重叠（注视点的连续呈现）、间隙（注视点偏移，在目标出现前0-400 ms）和无注视任务中快速扫视的发生率和频率。在后一范例中，受试者在准备好时触摸传感器，以便以0-400 ms的延迟时间（目标开始延迟时间）点燃目标灯。当差距范式与延迟时间为100 ms的自我启动范式相结合时，快速眼跳（反应时间为80-130 ms的眼跳）的出现频率最高（62%）。该值比正常间隙任务高20%。SRT减少时，躯体感觉刺激之前施加到目标，起始时间。这些结果表明，受试者的反应准备和作为警告信号的体感输入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.