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Nonsensory neglect

R T Watson, B D Miller, K M Heilman

    Annals of Neurology
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Frontal and reticular formation lesions in monkeys induced unilateral neglect. This suggests neglect stems from a defect in intention, not sensory inattention.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neurology

    Background:

    • Unilateral neglect is a neurological disorder characterized by a failure to respond to stimuli on the side opposite to a brain lesion.
    • The underlying mechanisms of unilateral neglect are debated, with theories including sensory inattention and attentional deficits.

    Purpose of the Study:

    • To investigate the neural mechanisms of unilateral neglect by inducing lesions in the frontal and reticular formation of monkeys.
    • To differentiate between sensory inattention and a defect of intention as the cause of neglect.

    Main Methods:

    • Five monkeys were trained on a task requiring responses to stimuli contralateral to a stimulus.
    • Unilateral neglect was induced via lesions to the frontal cortex and reticular formation.

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  • Postoperative performance was assessed under conditions of ipsilateral and contralateral stimulation.

    • Main Results:

    • Monkeys exhibited abnormal performance exclusively when responding to ipsilateral stimulation post-lesion.
    • Performance on contralateral stimulation remained within normal postoperative limits.
    • This pattern indicates a specific deficit related to the processing of ipsilateral stimuli.

    Conclusions:

    • The findings suggest that unilateral neglect following frontal and reticular formation lesions is not due to deafferentation or sensory inattention.
    • The results support the hypothesis that neglect arises from a fundamental defect in the intention or planning of actions.
    • This research provides critical insights into the neural basis of intention and its role in spatial awareness.