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Controlled scanpath variation alters fusiform face activation.

James P Morris1, Kevin A Pelphrey, Gregory McCarthy

  • 1Duke-UNC Brain Imaging and Analysis Center, Duke University Medical Center, Durham, NC 27710, USA.

Social Cognitive and Affective Neuroscience
|January 8, 2008
PubMed
Summary
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Eye movement patterns significantly influence brain activity during face perception. Typical scanpaths focusing on facial features increase fMRI activation in face-processing regions compared to atypical patterns.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Functional magnetic resonance imaging (fMRI) is used to study brain activity.
  • Eye movements play a role in visual perception.
  • Understanding how eye movements affect fMRI activation is crucial for accurate interpretation.

Purpose of the Study:

  • To investigate the impact of experimentally controlled saccades and fixations on fMRI activation.
  • To determine if typical versus atypical scanpaths differentially affect brain regions involved in face and object processing.

Main Methods:

  • Participants viewed static faces while performing guided saccades to a shifting fixation cross.
  • Two scanpath conditions were used: typical (fixating on eyes/mouth 90% of the time) and atypical (12% of the time).
Keywords:
fMRIface perceptionfusiform gyrus

Related Experiment Videos

  • fMRI data was analyzed in predefined face-sensitive areas, including the ventral occipitotemporal cortex (VOTC).

    • Main Results:

    • Typical scanpaths elicited significantly greater fMRI activation in the VOTC compared to atypical scanpaths.
    • Similar patterns of activation differences were observed in other brain regions, including frontal eye fields and superior colliculi.
    • Voxel-based analysis confirmed these findings across multiple brain areas.

    Conclusions:

    • fMRI activation is highly sensitive to the specific pattern of eye movements during face processing.
    • Uncontrolled eye movements can confound neuroimaging studies of face and object perception.
    • These findings highlight the importance of considering eye-tracking data in future fMRI research on visual perception.