Looming sensitive cortical regions without V1 input: Evidence from a patient with bilateral cortical blindness

Hervais-Adelman, Alexis, Legrand, Lore B., Zhan, Minye, Tamietto, Marco, de Gelder, Beatrice and Pegna, Alan J. (2015) Looming sensitive cortical regions without V1 input: Evidence from a patient with bilateral cortical blindness. Frontiers in Integrative Neuroscience, 9 51: 1-12. doi:10.3389/fnint.2015.00051


Author Hervais-Adelman, Alexis
Legrand, Lore B.
Zhan, Minye
Tamietto, Marco
de Gelder, Beatrice
Pegna, Alan J.
Title Looming sensitive cortical regions without V1 input: Evidence from a patient with bilateral cortical blindness
Journal name Frontiers in Integrative Neuroscience   Check publisher's open access policy
ISSN 1662-5145
Publication date 2015-10-22
Year available 2015
Sub-type Article (original research)
DOI 10.3389/fnint.2015.00051
Open Access Status DOI
Volume 9
Issue 51
Start page 1
End page 12
Total pages 12
Place of publication Lausanne, Switzerland
Publisher Frontiers Research Foundation
Collection year 2016
Language eng
Abstract Fast and automatic behavioral responses are required to avoid collision with an approaching stimulus. Accordingly, looming stimuli have been found to be highly salient and efficient attractors of attention due to the implication of potential collision and potential threat. Here, we address the question of whether looming motion is processed in the absence of any functional primary visual cortex and consequently without awareness. For this, we investigated a patient (TN) suffering from complete, bilateral damage to his primary visual cortex. Using an fMRI paradigm, we measured TN's brain activation during the presentation of looming, receding, rotating, and static point lights, of which he was unaware. When contrasted with other conditions, looming was found to produce bilateral activation of the middle temporal areas, as well as the superior temporal sulcus and inferior parietal lobe (IPL). The latter are generally thought to be involved in multisensory processing of motion in extrapersonal space, as well as attentional capture and saliency. No activity was found close to the lesioned V1 area. This demonstrates that looming motion is processed in the absence of awareness through direct subcortical projections to areas involved in multisensory processing of motion and saliency that bypass V1.
Keyword Blindsight
Motion
Looming
fMRI
Cortical blindness
Hemianopia
MT/V5
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Psychology Publications
 
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