Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555610
Title: Facilitatory and inhibitory processes of visuospatial selective attention in schizophrenia patients
Author: Kalogeropoulou, Fenia
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2011
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Abstract:
The aim of the present thesis was to investigate orienting of attention in space. Specifically, I aimed to investigate how apparently irrelevant locations are processed by healthy adults and schizophrenia patients. In a series of six Experiments we investigated the attentional bias (Posner & Cohen, 1984) against returning to already explored, but irrelevant, locations. We can consider this effect a measure of effective attentional orienting in space. A first general objective was to investigate factors that affect attentional orienting in healthy adults, as the inhibitory bias to return to previously explored locations is affected by manipulations that encourage endogenous orienting strategies. We proposed the hypothesis that orienting strategies are influenced by temporal manipulations of spatial events (Cheval & Chastain, 2002). In line with this expectation, we found that, in addition to the range of time intervals (short or long) employed in the task, the temporal gap between the time intervals also affected the time course of facilitation and inhibition at cued, irrelevant, locations. Thus, when there was a big gap between the short and the long time intervals, inhibition of the irrelevant location was delayed even when the range of intervals was long. Although the range of intervals was long, so there was enough time for attention to be shifted away from the irrelevant location (Cheval & Chastain, 2002), the long temporal gap between the short and long intervals probably lead to misperceptions of the actual duration of the temporal events (the middle intervals were perceived as being shorter) (Eagleman, 2008). As a result, attention was maintained longer at the attended, but irrelevant, location in order to detect the target efficiently. According to previous literature, we also expected that automatic reorienting of attention to the centre would affect onset and duration of facilitation and inhibition at the cued location (Pratt et al., 2000; 2002).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.555610  DOI: Not available
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