Eyetracker-based gaze correction for robust mapping of population receptive fields.
Neuroimage
; 142: 211-224, 2016 Nov 15.
Article
in En
| MEDLINE
| ID: mdl-27389789
ABSTRACT
Functional MRI enables the acquisition of a retinotopic map that relates regions of the visual field to neural populations in the visual cortex. During such a "population receptive field" (PRF) experiment, stable gaze fixation is of utmost importance in order to correctly link the presented stimulus patterns to stimulated retinal regions and the resulting Blood Oxygen Level Dependent (BOLD) response of the appropriate region within the visual cortex. A method is described that compensates for unstable gaze fixation by recording gaze position via an eyetracker and subsequently modifies the input stimulus underlying the PRF analysis according to the eyetracking measures. Here we show that PRF maps greatly improve when the method is applied to data acquired with either saccadic or smooth eye movements. We conclude that the technique presented herein is useful for studies involving subjects with unstable gaze fixation, particularly elderly patient populations.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pattern Recognition, Visual
/
Visual Cortex
/
Brain Mapping
/
Magnetic Resonance Imaging
/
Eye Movements
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Eye Movement Measurements
/
Motion Perception
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
Neuroimage
Journal subject:
DIAGNOSTICO POR IMAGEM
Year:
2016
Document type:
Article
Affiliation country:
Austria