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Vertical neglect: behavioral and electrophysiological data

S Pitzalis1, D Spinelli, P Zoccolotti

  • 1Research Center, IRCCS Ospedale S. Lucia, Rome.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 28, 1998
PubMed
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This study reveals that spatial neglect affects both horizontal and vertical dimensions. Patients with neglect showed more errors and longer visual response times in the lower left visual field.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Spatial neglect is a common deficit following brain injury, often characterized by a failure to attend to one side of space.
  • While horizontal neglect is well-studied, the impact on the vertical dimension remains less understood.

Purpose of the Study:

  • To investigate the presence and characteristics of altitudinal neglect using both behavioral and electrophysiological measures.
  • To determine if neglect affects spatial processing in both horizontal and vertical planes.

Main Methods:

  • Administered Albert's Barrage test to 100 neglect patients to assess behavioral omissions.
  • Recorded visual evoked potentials (VEPs) in 16 patients to evaluate electrophysiological responses to stimuli in four quadrants.

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  • Collected normative VEP data from 13 healthy young subjects for comparison.

    • Main Results:

    • Behavioral testing revealed the majority of omissions occurred in the lower left quadrant.
    • Electrophysiological recordings showed significantly longer latencies in the lower left quadrant compared to other quadrants.
    • Normative data confirmed typical response patterns in healthy individuals.

    Conclusions:

    • Spatial neglect impacts not only the horizontal dimension but also the vertical dimension of spatial awareness.
    • Both behavioral and electrophysiological findings support the presence of altitudinal neglect, particularly affecting the lower left visual field.
    • These results highlight the complex nature of spatial deficits in neglect patients.