Van der Stigchel S, Bethlehem R A I
Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.
Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands; Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom.
Neurosci Lett. 2014 Nov 7;583:126-9. doi: 10.1016/j.neulet.2014.09.040. Epub 2014 Sep 28.
Saccade initiation is facilitated when there is no physical stimulus at the start position of the saccade. There have been numerous explanations for this 'gap effect', the most prominent one being the facilitated release from active fixation when no visual information is present. Attributed to potential fixation sensitive neurons in the superior colliculus, previous research has suggested the gap effect to be a foveal specific effect. The aim of the present study was to investigate whether the gap effect is strictly a foveal effect by using a gaze-contingent eccentric fixation adaptation of the fixation offset paradigm. Results show that, although the gap effect is diminished under eccentric viewing conditions, it is still significantly present. This suggests that the gap effect is mediated by more than foveal specific factors alone. We argue that lateral interactions in the superior colliculus may also contribute to the gap effect.
当扫视起始位置没有物理刺激时，扫视起始会更容易。对于这种“间隙效应”有许多解释，最突出的一种是当没有视觉信息时，主动注视的释放更容易。由于上丘中潜在的注视敏感神经元，先前的研究表明间隙效应是一种中央凹特异性效应。本研究的目的是通过使用注视偏移范式的注视相关偏心注视适应来研究间隙效应是否严格是一种中央凹效应。结果表明，尽管在偏心观察条件下间隙效应减弱，但仍然显著存在。这表明间隙效应不仅仅由中央凹特异性因素介导。我们认为上丘中的侧向相互作用也可能导致间隙效应。
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