Adaptation to Leftward-Shifting Prisms Reduces the Global Processing Bias of Healthy Individuals

Autor/inn/en	Bultitude, Janet H.; Woods, Jill M.
Titel	Adaptation to Leftward-Shifting Prisms Reduces the Global Processing Bias of Healthy Individuals
Quelle	In: Neuropsychologia, 48 (2010) 6, S.1750-1756 (7 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0028-3932
DOI	10.1016/j.neuropsychologia.2010.02.024
Schlagwörter	Reaction Time; Patients; Visual Stimuli; Cognitive Processes; Brain Hemisphere Functions; Neurological Impairments; Attention; Spatial Ability + Suchen Sie Ihr Suchwort? Reaktionsvermögen; Patient; Cognitive process; Kognitiver Prozess; Neurodegenerative Erkrankung; Aufmerksamkeit; Räumliches Vorstellungsvermögen
Abstract	When healthy individuals are presented with peripheral figures in which small letters are arranged to form a large letter, they are faster to identify the global- than the local-level information, and have difficulty ignoring global information when identifying the local level. The global reaction time (RT) advantage and global interference effect imply preferential processing of global-level information in the normal brain. This contrasts with the local processing bias demonstrated following lesions to the right temporo-parietal junction (TPJ), such as those that lead to hemispatial neglect (neglect). Recent research from our lab demonstrated that visuo-motor adaptation to rightward-shifting prisms, which ameliorates many leftward performance deficits of neglect patients, improved the local processing bias of patients with right TPJ lesions (Bultitude, Rafal, & List, 2009). Here we demonstrate that adaptation to leftward-shifting prisms, which can induce neglect-like performance in neurologically healthy individuals, also reduces the normal global processing bias. Forty-eight healthy participants were asked to identify the global or local forms of hierarchical figures before and after adaptation to leftward- or rightward-shifting prisms. Prior to prism adaptation, both groups had greater difficulty ignoring irrelevant global information when identifying the local level (global interference) compared to their ability to ignore irrelevant local-level information when identifying the global level (local interference). Participants who adapted to leftward-shifting prisms showed a significant reduction in global interference, but there was no change in the performance of the rightward-shifting Prism Group. These results show, for the first time, that in addition to previously demonstrated effects on lateralised attention, prism adaptation can influence non-lateralised spatial attention in healthy individuals. (Contains 2 tables and 4 figures.) (As Provided).
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Update	2017/4/10