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Related Experiment Videos

Dual-task interference patterns reveal differential processing of upright and inverted faces

S K Hillis1, M Hiscock, J L Rexer

  • 1University of Saskatchewan, Canada.

Brain and Cognition
|July 1, 1995
PubMed
Summary

This study explored how the brain processes faces using a concurrent-task method. Right-hemisphere dominance was found for upright face encoding, while inverted faces showed bilateral processing.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Human Perception

Background:

  • Understanding the neural basis of face recognition is crucial for cognitive neuroscience.
  • Previous research suggests hemispheric specialization in face processing, but methods vary.
  • The concurrent-task method offers a novel approach to probe cognitive functions during interference.

Purpose of the Study:

  • To investigate the hemispheric locus of face encoding using a concurrent-task paradigm.
  • To determine if stimulus orientation (upright vs. inverted faces) affects lateralized processing.
  • To compare findings with established tachistoscopic methods for face perception.

Main Methods:

  • Employed a concurrent-task method with 48 right-handed adults.

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  • Participants performed unimanual finger tapping while encoding whole or partial faces.
  • Three experiments varied face orientation: upright (Experiments 1 & 2) and inverted (Experiment 3).

    • Main Results:

    • Face encoding equally disrupted left- and right-hand tapping, regardless of face orientation.
    • Upright faces showed impaired recognition when encoded during left-hand tapping compared to right-hand tapping.
    • Inverted faces did not exhibit lateralized recognition interference during concurrent tapping.

    Conclusions:

    • Results support right-hemispheric dominance for upright face encoding, aligning with tachistoscopic data.
    • Inverted face processing appears to involve bilateral hemispheric engagement.
    • The concurrent-task method effectively reveals lateralization in face perception and encoding.