Consciousness wanted, attention found: Reasons for the advantage of the left visual field in identifying T2 among rapidly presented series

Consciousness and Cognition
Rolf Verleger, Kamila Śmigasiewicz

Abstract

Everyday experience suggests that people are equally aware of events in both hemi-fields. However, when two streams of stimuli are rapidly presented left and right containing two targets, the second target is better identified in the left than in the right visual field. This might be considered evidence for a right-hemisphere advantage in generating conscious percepts. However, this putative asymmetry of conscious perception cannot be measured independently of participants' access to their conscious percepts, and there is actually evidence from split-brain patients for the reverse, left-hemisphere advantage in having access to conscious percepts. Several other topics were studied in search of the responsible mechanism, among others: Mutual inhibition of hemispheres, cooperation of hemispheres in perceiving midline stimuli, and asymmetries in processing various perceptual inputs. Directing attention by salient cues turned out to be one of the few mechanisms capable of modifying the left visual-field advantage in this paradigm. Thus, this left visual-field advantage is best explained by the notion of a right-hemisphere advantage in directing attention to salient events. Dovetailing with the pathological asymmetries of attention a...Continue Reading

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Citations

Dec 10, 2015·Frontiers in Aging Neuroscience·Ling Li, Dandan Zhao
Jun 13, 2015·Consciousness and Cognition·Bruno G BreitmeyerMichael Niedeggen
Dec 7, 2019·Attention, Perception & Psychophysics·Stefanie KlattNicholas J Smeeton
Jun 24, 2017·Attention, Perception & Psychophysics·Dafna BergerbestMoti Salti
Sep 3, 2020·Psychonomic Bulletin & Review·Michael C W EnglishTroy A W Visser

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