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Related Experiment Videos

Dissociated hemispheric and stimulus effects upon affective choice and recognition.

T Landis1, L Christen, R Graves

  • 1Department of Neurology, University Hospital, Zürich, Switzerland.

The International Journal of Neuroscience
|January 1, 1992
PubMed
Summary

Subliminal face presentations affected affective choices, while supraliminal word presentations influenced affective judgments. Recognition was unaffected, suggesting affective and recognition processes compete.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • The brain processes visual information differently based on its location in the visual field.
  • Affective (emotional) and recognition (identification) judgments may involve distinct neural pathways.
  • The impact of stimulus exposure duration (subliminal, liminal, supraliminal) on these processes is not fully understood.

Purpose of the Study:

  • To investigate how subliminal, liminal, and supraliminal visual presentations of faces and nonsense words influence subsequent affective and recognition choices.
  • To determine if these influences differ between stimulus types (faces vs. words) and visual fields.
  • To explore the relationship between affective and recognition judgments.

Main Methods:

  • Lateralized tachistoscopic presentation of faces and pronounceable nonsense words.

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  • Subjects made forced-choice judgments on either affective (emotional valence) or recognition (identity) tasks.
  • Varying exposure durations: subliminal (below awareness), liminal (at threshold), and supraliminal (clearly visible).

    • Main Results:

    • Subliminal presentations selectively enhanced later affective choices for faces, but not for words; recognition remained unaffected.
    • Supraliminal presentations enhanced later affective choices for words, but not for faces; recognition showed expected visual field advantages (left visual field for faces, right visual field for words).
    • Liminal presentations yielded no significant effects on either choice type.

    Conclusions:

    • Affective processing is differentially influenced by stimulus type and exposure duration, with subliminal stimuli impacting faces and supraliminal stimuli impacting words.
    • Recognition processing appears more consistent across exposure durations and visual fields.
    • Affective and recognition judgments seem to be competing processes, as only one type of judgment, not both, showed significant deviations from chance within a specific visual field and exposure condition.