Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada.
Neurosci Lett. 2012 Apr 18;514(2):214-8. doi: 10.1016/j.neulet.2012.03.004. Epub 2012 Mar 10.
When reaching to remembered target locations following an intervening eye movement a systematic pattern of error is found indicating eye-centred updating of visuospatial memory. Here we investigated if implicit targets, defined only by allocentric visual cues, are also updated in an eye-centred reference frame as explicit targets are. Participants viewed vertical bars separated by varying distances, and horizontal lines of equivalently varying lengths, implying a "target" location at the midpoint of the stimulus. After determining the implied "target" location from only the allocentric stimuli provided, participants saccaded to an eccentric location, and reached to the remembered "target" location. Irrespective of the type of stimulus reaching errors to these implicit targets are gaze-dependent, and do not differ from those found when reaching to remembered explicit targets. Implicit target locations are coded and updated as a function of relative gaze direction with respect to those implied locations just as explicit targets are, even though no target is specifically represented.
当在进行中间的眼动后，到达记忆中的目标位置时，会发现一种系统的错误模式，表明视觉空间记忆的以眼为中心的更新。在这里，我们研究了隐含目标是否也像明确目标一样，以眼为中心的参考系进行更新，这些隐含目标仅由离轴视觉线索定义。参与者观察由不同距离隔开的垂直条和长度相等的水平线条，暗示刺激的中点处存在“目标”位置。在仅从提供的离轴刺激中确定隐含“目标”位置后，参与者向偏心位置扫视，并到达记忆中的“目标”位置。无论刺激的类型如何，到达这些隐含目标的距离错误都是依赖于注视的，与到达记忆中明确目标的距离错误没有区别。即使没有明确表示目标，隐含目标位置也会根据相对于这些暗示位置的相对注视方向进行编码和更新，就像明确目标一样。
