Translator Disclaimer
9 February 2006 Modeling the time course of attention signals in human primary visual cortex
Author Affiliations +
Previous neuroimaging studies have documented the existence of attention signals in human visual cortex, but little is known about the time course of these signals. A recent study reported persistent activity in early visual cortex whose duration was correlated with the duration of sustained attention1. The present study extends these findings by modeling the time course of sustained attention signals with a linear function with duration equal to the period of sustained attention but with variable amplitude and slope. Subjects performed a visual detection task in which a variable-duration delay period occurred before every target presentation. This design required the subjects to allocate visuospatial attention throughout the delay period. Functional magnetic resonance imaging (fMRI) was used to record activity in primary visual cortex (cortical area V1) during performance of the task. There were significant individual differences in the time course of attention signals, with some subjects displaying time courses consistent with constant amplitude attention signals, while others showed decreasing amplitude of attention-related activity during the delay period. These individual differences in time course of attention signals were correlated with behavioral response bias, suggesting that they may reflect differences in the types of attention used by the subjects to perform the detection task. In particular, those subjects who had constant amplitude sustained attention signals may have been employing relatively more endogenous, or top-down attention, while the subjects who exhibited attention signals that decreased over time may have been using relatively more exogenous, or bottom-up attention.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael A. Silver "Modeling the time course of attention signals in human primary visual cortex", Proc. SPIE 6057, Human Vision and Electronic Imaging XI, 605714 (9 February 2006);


Symbolic binding
Proceedings of SPIE (June 01 2000)
Prediction of fMRI time series of a single voxel using...
Proceedings of SPIE (March 15 2011)
Drawing in the blind and the sighted as a probe...
Proceedings of SPIE (February 17 2010)
Modeling of functional brain imaging data
Proceedings of SPIE (March 21 1999)

Back to Top