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31-01-2018 | Original Article | Uitgave 1/2020

Psychological Research 1/2020

Object discrepancy modulates feature prediction across eye movements

Tijdschrift:
Psychological Research > Uitgave 1/2020
Auteurs:
Cassandra Philine Köller, Christian H. Poth, Arvid Herwig
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Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00426-018-0988-5) contains supplementary material, which is available to authorized users.

Abstract

Object perception across saccadic eye movements is assumed to result from integrating two information sources: incoming peripheral object information and information from a foveal prediction (Herwig and Schneider, J Exp Psychol Gen 143(5):1903–1922, 2014, Herwig, J Vis 15(16), 7, 2015). Predictions are supposed to be based on transsaccadic associations of peripheral and foveal object information. The main function of these predictions may be to conceal discrepancies in resolution and locations across saccades. Here we ask how predictions are affected by discrepancies between peripheral and foveal objects. Participants learned unfamiliar transsaccadic associations by making saccades to objects whose shape systematically changed during the saccade. Importantly, we manipulated the size of this change between participants to induce different magnitudes of object discrepancy. In a subsequent test, we found that judgment shifts of peripheral shape perception toward the predicted foveal input depended on change size during acquisition. Specifically, the contribution of prediction decreased for large changes but did not reach zero, showing that even for large changes (i.e., square to circle or vice versa) the prediction was not ignored completely. These findings indicate that object discrepancy during learning determines how much the resulting foveal prediction contributes to perception in the periphery.

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