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Local biases drive, but do not determine, the perception of illusory trajectories.

Abstract：

:When a dot moves horizontally across a set of tilted lines of alternating orientations, the dot appears to be moving up and down along its trajectory. This perceptual phenomenon, known as the slalom illusion, reveals a mismatch between the veridical motion signals and the subjective percept of the motion trajectory, which has not been comprehensively explained. In the present study, we investigated the empirical boundaries of the slalom illusion using psychophysical methods. The phenomenon was found to occur both under conditions of smooth pursuit eye movements and constant fixation, and to be consistently amplified by intermittently occluding the dot trajectory. When the motion direction of the dot was not constant, however, the stimulus display did not elicit the expected illusory percept. These findings confirm that a local bias towards perpendicularity at the intersection points between the dot trajectory and the tilted lines cause the illusion, but also highlight that higher-level cortical processes are involved in interpreting and amplifying the biased local motion signals into a global illusion of trajectory perception.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Gheorghes TN,Richardson P,Reidy J

doi

10.1038/s41598-020-64837-0

subject

Has Abstract

pub_date

2020-05-08 00:00:00

pages

7756

issue

1

issn

2045-2322

pii

10.1038/s41598-020-64837-0

journal_volume

10

pub_type

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