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Cross-over, completion and confabulation in unilateral spatial neglect

¹Department of Neurology, University of Alabama in Birmingham, USA.

Brain : a Journal of Neurology

|April 1, 1995

Summary

Patients with left-sided neglect exhibit unusual line bisection behavior on short lines. This study suggests this cross-over phenomenon stems from a lack of inhibition in confabulating leftward mental representations.

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Area of Science:

Neuroscience
Cognitive Psychology
Perception

Background:

Left-sided neglect often causes patients to mis-bisect horizontal lines to the right of the midpoint.
A puzzling exception is their tendency to cross over and mark short lines to the left, defying current neglect theories.

Observation:

This study investigated whether reading tasks could elucidate the mechanisms behind left-sided neglect, specifically the short-line bisection anomaly.
Line bisection performance follows a power function (psi = K phi beta), relating subjective awareness to objective measurements.

Findings:

Performance in both line bisection and reading tasks for patients with left-sided neglect adhered to power functions.
Patients' performance severity was consistent across both tasks, indicating their comparability.
Reading short words revealed that patients perceived extra letters to the left, mirroring the leftward extension seen in short-line bisections.

Implications:

The short-line bisection anomaly is interpreted as a confabulatory process, an overextension beyond the line's endpoint due to a lack of inhibition.
This suggests that confabulation at the left edge of the attentional window might be more prevalent in neglect patients than previously understood.
The findings propose a unified explanation for neglect phenomena, involving a continuous lack of inhibition across various stimuli lengths.

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