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The electroencephalogram in neglect.

R T Watson, M Andriola, K M Heilman

    Journal of the Neurological Sciences
    |December 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Patients with unilateral neglect exhibit widespread electroencephalographic (EEG) abnormalities, even in brain regions distant from the lesion. This suggests neglect may stem from a unilateral arousal deficit.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Clinical Electrophysiology

    Background:

    • Unilateral neglect is a neurological disorder characterized by a failure to respond to stimuli on one side of space.
    • The underlying neural mechanisms of unilateral neglect are not fully understood, particularly the extent and distribution of brain dysfunction.

    Purpose of the Study:

    • To compare the electroencephalographic (EEG) abnormalities in patients with unilateral neglect to those in aphasic control patients.
    • To investigate the relationship between discrete brain lesions, EEG slowing, and the presence of unilateral neglect.

    Main Methods:

    • Electroencephalography (EEG) was performed on 23 consecutive patients diagnosed with unilateral neglect.
    • EEG findings were compared with those of 20 matched patients with aphasia (control group).

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  • The extent and location of EEG abnormalities, specifically slowing, were analyzed and compared between groups.

    • Main Results:

    • A significant majority of patients with unilateral neglect (22 out of 23) displayed widespread EEG slowing across the entire hemisphere.
    • In contrast, only 8 out of 20 aphasic control patients showed similar hemispheric slowing.
    • EEG slowing was observed in brain regions remote from the site of the initial lesion in neglect patients.

    Conclusions:

    • Unilateral neglect is associated with extensive electroencephalographic abnormalities that can extend beyond the lesioned area.
    • These findings support the hypothesis that unilateral neglect may result from a deficit in unilateral arousal.
    • EEG can reveal widespread cerebral dysfunction in neglect patients, even when lesions are localized.