Spatio-temporal brain activation profiles associated with line bisection judgments and double simultaneous visual stimulation

R. L. Billingsley, P. G. Simos, S. Sarkari, J. M. Fletcher, Andrew Papanicolaou

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We used magnetic source imaging (MSI) to investigate the spatio-temporal patterns of brain activity associated with line bisection judgments and double simultaneous visual stimulation in 14 healthy adults. Consistent with lesion and hemodynamic neuroimaging studies, we found the greatest number of activity sources in right inferior parietal cortex. These sources were most prominent, on average, between 200 and 300 ms after the onset of single (left, right, or center) target stimuli. A greater number of significant activity sources were found in right inferior parietal, occipital, and prefrontal cortices during bilateral compared with unilateral stimulus presentation. Based on these observations, we suggest that a more parsimonious physiological explanation of visual extinction than the hemispheric rivalry account may be the additional neuronal excitation required in right occipital and parietal cortices for accurate bilateral visual perception.

Original languageEnglish (US)
Pages (from-to)97-107
Number of pages11
JournalBehavioural Brain Research
Volume152
Issue number1
DOIs
StatePublished - Jun 4 2004

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Photic Stimulation
Parietal Lobe
Occipital Lobe
Brain
Visual Perception
Prefrontal Cortex
Neuroimaging
Hemodynamics

All Science Journal Classification (ASJC) codes

  • Behavioral Neuroscience

Cite this

Spatio-temporal brain activation profiles associated with line bisection judgments and double simultaneous visual stimulation. / Billingsley, R. L.; Simos, P. G.; Sarkari, S.; Fletcher, J. M.; Papanicolaou, Andrew.

In: Behavioural Brain Research, Vol. 152, No. 1, 04.06.2004, p. 97-107.

Research output: Contribution to journalArticle

Billingsley, R. L. ; Simos, P. G. ; Sarkari, S. ; Fletcher, J. M. ; Papanicolaou, Andrew. / Spatio-temporal brain activation profiles associated with line bisection judgments and double simultaneous visual stimulation. In: Behavioural Brain Research. 2004 ; Vol. 152, No. 1. pp. 97-107.
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