Smith Tim J, Henderson John M
Psychology, Malet Street, Birkbeck, University of London, London WC1E 7HX, UK.
Atten Percept Psychophys. 2011 Nov;73(8):2384-98. doi: 10.3758/s13414-011-0191-x.
Oculomotor inhibition of return (IOR) is believed to facilitate scene scanning by decreasing the probability that gaze will return to a previously fixated location. This "foraging" hypothesis was tested during scene search and in response to sudden-onset probes at the immediately previous (one-back) fixation location. The latencies of saccades landing within 1º of the previous fixation location were elevated, consistent with oculomotor IOR. However, there was no decrease in the likelihood that the previous location would be fixated relative to distance-matched controls or an a priori baseline. Saccades exhibit an overall forward bias, but this is due to a general bias to move in the same direction and for the same distance as the last saccade (saccadic momentum) rather than to a spatially specific tendency to avoid previously fixated locations. We find no evidence that oculomotor IOR has a significant impact on return probability during scene search.
动眼抑制返回（IOR）被认为通过降低注视回到先前注视位置的概率来促进场景扫描。这一“觅食”假说在场景搜索过程中以及对紧接在前（前一个）注视位置的突发探测的反应中得到了检验。落在先前注视位置1°范围内的扫视潜伏期延长，这与动眼IOR一致。然而，相对于距离匹配的对照组或先验基线，先前位置被注视的可能性并没有降低。扫视总体上表现出向前偏向，但这是由于与上一次扫视朝相同方向、移动相同距离的一般偏向（扫视动量），而不是由于在空间上特定的避免先前注视位置的倾向。我们没有发现证据表明动眼IOR在场景搜索过程中对返回概率有显著影响。
