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Right-hemisphere interactions in picture-word processing.

G Underwood, A Whitfield

    Brain and Cognition
    |July 1, 1985
    PubMed
    Summary
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    Picture processing shows a left visual-field (LVF) advantage in categorization tasks, unlike previous naming tasks. Related words facilitate processing in the right hemisphere, suggesting right-hemisphere localization for picture recognition.

    Area of Science:

    • Cognitive Neuroscience
    • Neuropsychology
    • Visual Perception

    Background:

    • Previous studies using naming tasks reported right visual-field (RVF) advantages for picture processing, suggesting left-hemisphere dominance.
    • Response effects in naming tasks may confound the interpretation of visual-field asymmetries.

    Purpose of the Study:

    • To investigate visual-field asymmetries in picture processing by eliminating naming task confounds.
    • To examine the influence of word distractors and semantic relatedness on picture processing.
    • To determine the cerebral localization of picture recognition and semantic effects.

    Main Methods:

    • Three experiments were conducted using picture categorization tasks.
    • Visual stimuli were presented to either the left visual-field (LVF) or right visual-field (RVF).

    Related Experiment Videos

  • Masked and unmasked displays, along with word distractors, were employed to probe processing mechanisms.

    • Main Results:

    • Categorization tasks revealed a significant LVF advantage (indicating right-hemisphere processing) for picture accuracy and response latency.
    • Semantic facilitation occurred with masked displays when words were related to pictures and presented to the right hemisphere.
    • Inhibition effects were observed with unmasked displays, suggesting response competition rather than semantic facilitation.

    Conclusions:

    • Picture recognition is primarily localized within the right cerebral hemisphere.
    • Semantic facilitation effects are likely mediated by the left hemisphere during recognition, while response competition influences later stages.
    • Previous reports of left-hemisphere advantages in picture-word tasks may stem from response competition in naming.