Self-motion induced environmental kinetopsia and pop-out illusion - Insight from a single case phenomenology

Thirumal Appaswamy Prabhakar, George Abraham Ninan, Anupama Roy, Sharath Kumar, Kavitha Margabandhu, Jessica Michael, Deepti Bal, Pavithra Mannam, Allison M McKendrick, Olivia Carter, Marta I Garrido

Research output: Contribution to journalArticlepeer-review

Abstract

Stable visual perception, while we are moving, depends on complex interactions between multiple brain regions. We report a patient with damage to the right occipital and temporal lobes who presented with a visual disturbance of inward movement of roadside buildings towards the centre of his visual field, that occurred only when he moved forward on his motorbike. We describe this phenomenon as "self-motion induced environmental kinetopsia". Additionally, he was identified to have another illusion, in which objects displayed on the screen, appeared to pop out of the background. Here, we describe the clinical phenomena and the behavioural tasks specifically designed to document and measure this altered visual experience. Using the methods of lesion mapping and lesion network mapping we were able to demonstrate disrupted functional connectivity in the areas that process flow-parsing such as V3A and V6 that may underpin self-motion induced environmental kinetopsia. Moreover, we suggest that altered connectivity to the regions that process environmental frames of reference such as retrosplenial cortex (RSC) might explain the pop-out illusion. Our case adds novel and convergent lesion-based evidence to the role of these brain regions in visual processing.

Original languageEnglish
Article number108820
JournalNeuropsychologia
Volume196
Early online date7 Feb 2024
DOIs
Publication statusPublished - 15 Apr 2024

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