Institute for Experimental Psychology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
J Neurophysiol. 2024 Jul 1;132(1):61-67. doi: 10.1152/jn.00117.2024. Epub 2024 May 29.
Temporal intervals appear compressed at the time of saccades. Here, I asked if saccadic compression of time is related to motor planning or to saccade execution. To dissociate saccade motor planning from its execution, I used the double-step paradigm, in which subjects have to perform two horizontal saccades successively. At various times around the saccade sequence, I presented two large horizontal bars, which marked an interval lasting 100 ms. After 700 ms, a second temporal interval was presented, varying in duration across trials. Subjects were required to judge which interval appeared shorter. I found that during the first saccades in the double-step paradigm, temporal intervals were compressed. Maximum temporal compression coincided with saccade onset. Around the time of the second saccade, I found temporal compression as well, however, the time of maximum compression preceded saccade onset by about 70 ms. I compared the magnitude and time of temporal compression between double-step saccades and amplitude-matched single saccades, which I measured separately. Although I found no difference in time compression magnitude, the time when maximum compression occurred differed significantly. I conclude that the temporal shift of time compression in double-step saccades demonstrates the influence of saccade motor planning on time perception. Visually defined temporal intervals appear compressed at the time of saccades. Here, I tested time perception during double-step saccades dissociating saccade planning from execution. Although around the time of the first saccade, peak compression was found at saccade onset, compression around the time of the second saccade peaked 70 ms before saccade onset. The results suggest that saccade motor planning influences time perception.
在眼球跳动时，时间间隔似乎会被压缩。在这里，我想知道眼球跳动对时间的压缩是否与运动规划有关，还是与眼球跳动的执行有关。为了将眼球跳动的运动规划与执行分开，我使用了双步范式，在这种范式中，受试者必须连续进行两次水平眼球跳动。在眼球跳动序列的各个时间点，我呈现了两个大的水平条，标记了一个持续 100 毫秒的间隔。700 毫秒后，呈现了第二个时间间隔，其持续时间在试验中变化。要求受试者判断哪个间隔看起来更短。我发现，在双步范式中的第一次眼球跳动期间，时间间隔被压缩。最大时间压缩与眼球跳动开始时间一致。在第二次眼球跳动的时间附近，我也发现了时间压缩，但最大压缩时间比眼球跳动开始时间提前了约 70 毫秒。我比较了双步眼球跳动和单独测量的幅度匹配的单眼球跳动之间的时间和时间压缩的幅度。虽然我没有发现时间压缩幅度的差异，但最大压缩时间的差异非常显著。我得出结论，双步眼球跳动中时间压缩的时间偏移表明了眼球运动规划对时间感知的影响。视觉定义的时间间隔在眼球跳动时似乎被压缩。在这里，我通过将眼球跳动的规划与执行分开，测试了双步眼球跳动期间的时间感知。尽管在第一次眼球跳动时，最大压缩出现在眼球跳动开始时，但在第二次眼球跳动时，压缩在眼球跳动开始前 70 毫秒达到峰值。结果表明，眼球运动规划会影响时间感知。
