'What' and 'Where' in Visual Attention: Evidence from the Neglect Syndrome

Farah, Martha J.; Wallace, Marcie A.; Vecera, Shaun P.

doi:10.21236/ada246932

Cited by 37 publications

(35 citation statements)

References 7 publications

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“…So, rather than being equally impaired in using attentional processes to parse space in terms of specific locations and the objects that occupy those locations, children with DS22q11.2 appear to have a relative strength in using object boundaries to structure visual space and to use that structure for navigation and the information extraction. The fact that the same group of children is relatively poor on spatially mediated attention and relatively strong on object-mediated attention lends support to the notion that although similar, these two attentional domains are supported by different brain networks (Farah et al, 1993). This may provide some behavioral evidence of a hemispheric asymmetry in children with DS22q11.2, in that previous evidence exists for a right posterior parietal bias for spatial-based shifts and left posterior parietal bias for object-based shifts (Egly et al, 1994a).…”

Section: Discussionmentioning

confidence: 63%

“…Similar in nature to space-based attention, object-based attention involves the ability to use cues within an object to enhance the processing of target information elsewhere within the confines of the same object. While similar in function to space-based attention, object-based attention is thought to be an independent process (Farah, Wallace, & Vecera, 1993;Duncan, 1984), and is likely to depend on a different neurological mechanism (Egly, Driver, &Rafal, 1994a). Since previous investigations of DS22q11.2 have focused primarily on spatial processing, what remains unclear is whether or not the impairments in space-based attention extend into the domain of object-based attention.…”

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confidence: 99%

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Domain specific attentional impairments in children with chromosome 22q11.2 deletion syndrome

Bish

Chiodo

Mattei

et al. 2007

Brain and Cognition

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One of the defining cognitive characteristics of the chromosome 22q deletion syndrome (DS22q11.2) is visuospatial processing impairments. The purpose of this study was to investigate and extend the specific attentional profile of children with this disorder using both an object-based attention task and an inhibition of return task. A group of children with the disorder was compared in these tasks with a group of age-matched typically developing children. The children with DS22q11.2 demonstrated impaired spatially based orienting which is consistent with previous findings in this group. Strikingly, the children with DS22q11.2 also demonstrated an improved ability to use objectbased cues, relative to the typically developing group. Finally, the children with DS22q11.2 demonstrated an intact inhibition of return system, however, it appears to be delayed developmentally.

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Section: Discussionmentioning

confidence: 63%

mentioning

confidence: 99%

Domain specific attentional impairments in children with chromosome 22q11.2 deletion syndrome

Bish

Chiodo

Mattei

et al. 2007

Brain and Cognition

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“…However, we think that under appropriate conditions, the in¯uence can also work in the other direction (see Farah, Wallace, & Vercera, 1993;Humphreys, Olson, Romani, & Riddoch, 1996), with attentional processes modulating segmentation processes to some extent. In our ®nal experimental section, we give a recent example of this possibility from our own work.…”

Section: Differential Effects Of Modal Versus Amodal Completion Upon mentioning

confidence: 99%

Segmentation, attention and phenomenal visual objects

et al. 2001

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Issues concerning selective attention provoke new questions about visual segmentation, and vice-versa. We illustrate this by describing our recent work on grouping under conditions of inattention, on change blindness for background events and the residual processing of undetected background changes, on modal versus amodal completion in visual search, and the differential effects of these two forms of completion on attentional processes, and on attentional modulation of lateral interactions thought to arise in early visual cortex. Many of these results indicate that segmentation processes substantially constrain attentional processes, but the reverse in¯uence is also apparent, suggesting an interactive architecture. We discuss how the`proto-objects' revealed by studies of segmentation and attention (i.e. the segmented perceptual units which constrain selectivity) may relate to other object-based notions in cognitive science, and we wrestle with their relation to phenomenal visual awareness. q

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“…[59]). Moreover, visual search paradigms similar to the one used here have also been used in a few studies with neglect patients and these have also shown benefits from pre-attentive processes, despite the fact that the control of focal attention was compromised in these patients [3,25,27,33].…”

Section: Discussionmentioning

confidence: 99%