Fast responses to neglected targets in visual search reflect pre-attentive processes: an exploration of response times in visual neglect

Laeng, Bruno; Brennen, Tim; Espeseth, Thomas

doi:10.1016/s0028-3932(01)00230-5

Cited by 19 publications

(18 citation statements)

References 87 publications

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“…Second, we wanted to determine whether the adaptive search measures reflect a dissociation previously found in fixed-parameter search studies. Specifically, patients with hemispatial neglect have shown greater difficulty finding conjunctions of features (such as a red square among red triangles and blue squares) than finding singleton features (such as a blue circle among red and yellow circles) when presented in their contralesional field (e.g., Eglin et al, 1989Eglin et al, , 1991Eglin et al, , 1994Esterman et al, 2000;Hildebrandt et al, 2005;Laeng et al, 2002;Pavlovskaya et al, 2002;Riddoch & Humphreys, 1987). b Furthermore, we focused our investigation on lateralized visual impairments in hemispatial neglect.…”

Section: Introductionmentioning

confidence: 99%

Visual hemispatial neglect, re-assessed

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Brooks

Esterman

et al. 2008

J. Inter. Neuropsych. Soc.

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Increased computer use in clinical settings offers an opportunity to develop new neuropsychological tests that exploit the control computers have over stimulus dimensions and timing. However, before adopting new tools, empirical validation is necessary. In the current study, our aims were twofold: to describe a computerized adaptive procedure with broad potential for neuropsychological investigations, and to demonstrate its implementation in testing for visual hemispatial neglect. Visual search results from adaptive psychophysical procedures are reported from 12 healthy individuals and 23 individuals with unilateral brain injury. Healthy individuals reveal spatially symmetric performance on adaptive search measures. In patients, psychophysical outcomes (as well as those from standard paper-and-pencil search tasks) reveal visual hemispatial neglect. Consistent with previous empirical studies of hemispatial neglect, lateralized impairments in adaptive conjunction search are greater than in adaptive feature search tasks. Furthermore, those with right hemisphere damage show greater lateralized deficits in conjunction search than do those with left hemisphere damage. We argue that adaptive tests, which automatically adjust to each individual's performance level, are efficient methods for both clinical evaluations and neuropsychological investigations and have the potential to detect subtle deficits even in chronic stages, when flagrant clinical signs have frequently resolved. (JINS, 2008, 14, 243-256.)

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Section: Introductionmentioning

confidence: 99%

Visual hemispatial neglect, re-assessed

List

Brooks

Esterman

et al. 2008

J. Inter. Neuropsych. Soc.

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“…One paradigm that is typically used to study attentional mechanisms both with normal subjects and with parietal patients is visual search (Arguin, Joanette, & Cavanagh, 1993;Esterman, McGlinchey-Berroth, & Milber, 2000) where observers are asked to detect or discriminate a target item among distractors. Right parietal patients' performance is generally normal when they are asked to perform a simple search task (say, finding a red target among green distractors), while they are impaired in more difficult searches when attentional resources must be allocated to each display item in turn (Laeng, Brennen, & Espeseth, 2002).…”

Section: Introductionmentioning

confidence: 99%

Perception of biological motion in parietal patients

2003

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“…A red item in a sea of blue and green items 'pops out' independently of the number of blue and green distractors (Esterman, McGlinchey-Beroth, & Milberg, 2000;Laeng, Brennen, & Espeseth, 2002;Riddoch & Humphreys, 1987). This suggests that 'pre-attentive' feature detection mechanisms (Treisman & Gelade, 1980) implicated in parallel visual search remain intact in the contralesional visual field.…”

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confidence: 99%