Spatial and temporal dynamics of visual search tasks distinguish subtypes of unilateral spatial neglect

Comparison of two cases with viewer-centered and stimulus-centered neglect

Katsuhiro Mizuno, Kenji Kato, Tetsuya Tsuji, Keiichiro Shindo, Yukiko Kobayashi, Meigen Liu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We developed a computerised test to evaluate unilateral spatial neglect (USN) using a touchscreen display, and estimated the spatial and temporal patterns of visual search in USN patients. The results between a viewer-centered USN patient and a stimulus-centered USN patient were compared. Two right-brain-damaged patients with USN, a patient without USN, and 16 healthy subjects performed a simple cancellation test, the circle test, a visuomotor search test, and a visual search test. According to the results of the circle test, one USN patient had stimulus-centered neglect and a one had viewer-centered neglect. The spatial and temporal patterns of these two USN patients were compared. The spatial and temporal patterns of cancellation were different in the stimulus-centered USN patient and the viewer-centered USN patient. The viewer-centered USN patient completed the simple cancellation task, but paused when transferring from the right side to the left side of the display. Unexpectedly, this patient did not exhibit rightward attention bias on the visuomotor and visual search tests, but the stimulus-centered USN patient did. The computer-based assessment system provided information on the dynamic visual search strategy of patients with USN. The spatial and temporal pattern of cancellation and visual search were different across the two patients with different subtypes of neglect.

Original languageEnglish
JournalNeuropsychological Rehabilitation
DOIs
Publication statusAccepted/In press - 2015 Jun 10

Fingerprint

Visual Search
Stimulus
Neglect
Viewer
Information Systems
Healthy Volunteers
Brain
Brain-damaged

Keywords

  • Allocentric neglect
  • Egocentric neglect
  • Hemi-neglect
  • Spatial reference frame
  • Visual attention

ASJC Scopus subject areas

  • Applied Psychology
  • Neuropsychology and Physiological Psychology
  • Rehabilitation
  • Arts and Humanities (miscellaneous)

Cite this

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title = "Spatial and temporal dynamics of visual search tasks distinguish subtypes of unilateral spatial neglect: Comparison of two cases with viewer-centered and stimulus-centered neglect",
abstract = "We developed a computerised test to evaluate unilateral spatial neglect (USN) using a touchscreen display, and estimated the spatial and temporal patterns of visual search in USN patients. The results between a viewer-centered USN patient and a stimulus-centered USN patient were compared. Two right-brain-damaged patients with USN, a patient without USN, and 16 healthy subjects performed a simple cancellation test, the circle test, a visuomotor search test, and a visual search test. According to the results of the circle test, one USN patient had stimulus-centered neglect and a one had viewer-centered neglect. The spatial and temporal patterns of these two USN patients were compared. The spatial and temporal patterns of cancellation were different in the stimulus-centered USN patient and the viewer-centered USN patient. The viewer-centered USN patient completed the simple cancellation task, but paused when transferring from the right side to the left side of the display. Unexpectedly, this patient did not exhibit rightward attention bias on the visuomotor and visual search tests, but the stimulus-centered USN patient did. The computer-based assessment system provided information on the dynamic visual search strategy of patients with USN. The spatial and temporal pattern of cancellation and visual search were different across the two patients with different subtypes of neglect.",
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AU - Liu, Meigen

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