In perceptual extinction, neglect patients:

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Question under consideration: In perceptual extinction, neglect patients:
Option 1: Show impairment in responding to two weak, near-threshold visual stimuli. This is not the typical description of perceptual extinction. Extinction concerns failure to perceive the contralesional stimulus when a competing stimulus is present on the ipsilesional side, rather than a general deficit to two weak stimuli across the field. So this option misstates the bilateral stimulus interaction and the typical salience considerations.
Option 2: Show impairment in responding to two strong stimuli. This aligns with the idea that extinction emerges when two stimuli are presented simultaneously on opposite sides; the contralesional stimulus may be impaired to report despite being perceptible when presented alone, especially under conditions of attention competition. By emphasizing simultaneous bilateral strong stimuli, this option captures the core phenomenon described in extinction literature, where the presence of a bilateral stimulus pair reveals the lesion through failure to report the contralesional item.
Option 3: Show impairment in responding to a weak stimulus presented in the left visual field. This describes a unilateral deficit rather than extinction, which requires competition between stimuli across hemispheres. A single left-field weak stimulus does not invoke the extinction mechanism, since there is no competing ipsilesional stimulus to suppress awareness of the contralesional item.
Option 4: Show impairment in responding to a strong stimulus presented in the right visual field. This is also a unilateral deficit description and does not address the bilateral-stimulus competition central to extinction. Extinction hinges on the interaction between a left (contralesional) and a right (ipsilesional) stimulus, not on a single-field unilateral strong stimulus.
In summary, extinction is best characterized by the interplay of bilateral stimulation leading to failure to report the contralesional item when both stimuli are presented together, which is most consistent with option 2 in this set.

PSYC20007_2025_SM2 Week 8: Object-Based Attention & the Cognitive Neuropsychology of Attention

In perceptual extinction, neglect patients:

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