15:00 - 16:30
Submission 448
Oscillations in Information Sampling for Transsaccadic Object Correspondence
Posterwall-25
Presented by: Fabian Parth
Fabian Parth 1, Alexander C. Schütz 1, 2
1 Institute of Psychology, University of Marburg, Germany
2 Center for Mind, Brain and Behavior, Marburg, Gießen & Darmstadt, Germany
Peripheral vision enables the detection of potential targets for subsequent foveal inspection via saccadic eye movements. The integration of pre- and postsaccadic visual information relies on transsaccadic object correspondence (TOC), which determines whether two retinal inputs are perceived as originating from the same object. Successful TOC depends on various object features—such as shape, color, texture, location and perceptual completion. However, the temporal dynamics and neural correlates of TOC remain poorly understood.

In the present study, we employed a postsaccadic target selection paradigm using an oriented Gabor patch as the presaccadic target. The patch’s orientation fluctuated every 25 ms until participants initiated a saccade towards it. Orientations were drawn randomly from a Gaussian distribution with a mean orientation rotated either clockwise or counterclockwise relative to vertical. Upon saccade onset, two static postsaccadic candidates appeared, one of which shared the mean orientation of the presaccadic target while the other one showed the vertically mirrored orientation. Participants were asked to make a second saccade to the matching candidate and to also choose the matching candidate via button press.

To identify which presaccadic time window contributes to a successful TOC, we performed a millisecond-resolved receiver operating characteristic (ROC) analysis on the presaccadic orientation sequence. This analysis quantified how instantaneous orientation noise influenced subsequent saccadic and manual target selection. The resulting temporal profile revealed oscillatory fluctuations, indicating rhythmic modulation of noise influence on TOC. These oscillations may reflect underlying neural mechanisms related to attentional sampling and transsaccadic integration.