Lavergne Louisa, Doré-Mazars Karine, Lappe Markus, Lemoine Christelle, Vergilino-Perez Dorine
Centre de Recherche Cerveau et Cognition, UMR5549, Université Paul Sabatier, CHU Purpan, Toulouse, France; Centre National de la Recherche Scientifique, France.
J Vis. 2012 Jun 4;12(6):6. doi: 10.1167/12.6.6.
Around the onset of a saccade toward a target, localization judgments are systematically biased toward the saccade endpoint. This perisaccadic compression is thought to be related to transsaccadic reorganization and due to interfering motor signals in visual maps. It has, however, only been investigated for saccades targeting a single target. Here, we examined whether saccade-sequence programming to stationary target(s) would affect the pattern of localization judgments of a briefly flashed stimulus. We presented saccade targets that could induce either a single saccade or two-saccade sequences and we flashed a bar around saccade onsets. For all two-saccade-sequence conditions, we showed that localization judgments of the stimulus flashed around the first saccade onset are biased toward an intermediate position between the two-saccade landing position, indicating the influence of the second saccade's parallel planning. This implies that motor-planning signals are most likely responsible for perisaccadic compression than motor execution feedback.
在朝向目标的扫视开始前后，定位判断会系统性地偏向扫视终点。这种扫视周围压缩现象被认为与跨扫视重组有关，并且是由于视觉地图中干扰性的运动信号所致。然而，此前仅针对指向单个目标的扫视进行过研究。在此，我们探究了对静止目标进行扫视序列编程是否会影响短暂闪现刺激的定位判断模式。我们呈现了可诱发单个扫视或两个扫视序列的扫视目标，并在扫视开始时闪现一条横条。对于所有两个扫视序列的条件，我们发现，在第一次扫视开始时闪现的刺激的定位判断偏向于两个扫视着陆位置之间的中间位置，这表明了第二次扫视的并行规划的影响。这意味着运动规划信号比运动执行反馈更有可能是扫视周围压缩现象的原因。
