![]() ![]() ![]() Gap/overlap effects involve an oculomotor component associated with neuronal activity in the superior colliculus (SC), a multisensory subcortical structure devoted to sensory-motor transformation. Here we tested our previous assumption that beeps shift the perceived timing of target onset and result in two competing effects on saccade latencies: a multisensory modulation in line with the expected perceptual effect and an illusory gap/overlap effect, resulting from target appearance being perceived later/closer in time than fixation offset and shortening/lengthening saccade latencies. We found that unlocalized beeps delivered near the onset time of a visual target reduce latencies, more for early beeps and less for late beeps, however, this modulation is far weaker than for perceptual temporal judgments. Several studies showed that sounds can impact the latency of visually guided saccades depending on when and where they are delivered. Throughout the day, humans react to multisensory events conveying both visual and auditory signals by rapidly reorienting their gaze. The present findingsĪre discussed with respect to the incompatible goals of fixation-locking and fixation-shifting oculomotor responses. (b) saccadic shifts during smooth visual pursuit, and (c) saccadic shifts during extrafoveal fixation. Results extend reports of the gap effect for saccadic shifts during visual fixation to (a) vergence shifts during visual fixation, InĮxperiment 3, a gap effect was observed for saccades directed at a target that appeared during extrafoveal fixation. In ExperimentĢ, a gap effect was observed for saccades directed at a target that appeared during visual pursuit of a moving stimulus. In Experiment 1, a gap effect was observed for vergence eye movements. Were in overlap conditions (the gap effect). Consistent with previous research, saccadic latencies were shorter in gap conditions than they The stimulus at fixation was turned off either before target onset (gap condition) or after target We examined eye-movement latencies to a target that appeared during visual fixation of a stationary stimulus, a moving stimulus, ![]()
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