Diederich Adele, Colonius Hans
School of Humanities and Social Sciences, Jacobs University Bremen, Bremen, Germany.
Percept Psychophys. 2007 Jan;69(1):56-67. doi: 10.3758/bf03194453.
Saccadic reaction time (SRT) to visual targets tends to be shorter when nonvisual stimuli are presented in close temporal or spatial proximity, even when subjects are instructed to ignore the accessory input. Here, we investigate visual-tactile interaction effects on SRT under varying spatial configurations. SRT to bimodal stimuli was reduced by up to 30 msec, in comparison with responses to unimodal visual targets. In contrast to previous findings, the amount of multisensory facilitation did not decrease with increases in the physical distance between the target and the nontarget but depended on (1) whether the target and the nontarget were presented in the same hemifield (ipsilateral) or in different hemifields (contralateral), (2) the eccentricity of the stimuli, and (3) the frequency of the vibrotactile nontarget. The time-window-of-integration (TWIN) model for SRT (Colonius & Diederich, 2004) is shown to yield an explicit characterization of the observed multisensory spatial interaction effects through the removal of the peripheral-processing effects of stimulus location and tactile frequency.
当非视觉刺激在时间或空间上接近呈现时，即使受试者被指示忽略辅助输入，对视觉目标的扫视反应时间（SRT）往往会更短。在此，我们研究了在不同空间配置下视觉-触觉相互作用对SRT的影响。与对单峰视觉目标的反应相比，对双峰刺激的SRT减少了多达30毫秒。与先前的研究结果相反，多感官促进的程度并没有随着目标与非目标之间物理距离的增加而降低，而是取决于：（1）目标和非目标是在同一半视野（同侧）还是在不同半视野（对侧）呈现；（2）刺激的偏心率；以及（3）振动触觉非目标的频率。结果表明，用于SRT的整合时间窗口（TWIN）模型（Colonius & Diederich，2004）通过消除刺激位置和触觉频率的外周处理效应，对观察到的多感官空间相互作用效应进行了明确的表征。
