Transient neural activity in human parietal cortex during spatial attention shifts. S, S.&nbsp;J<nbsp>Y.; JT, C.&nbsp;R.<nbsp>S.; MA, P.&nbsp;J.<nbsp>S.; and SM., C. Nature Neuroscience, 5(10):995-1002, Oct, 2002.
abstract   bibtex   
Observers viewing a complex visual scene selectively attend to relevant locations or objects and ignore irrelevant ones. Selective attention to an object enhances its neural representation in extrastriate cortex, compared with those of unattended objects, via top-down attentional control signals. The posterior parietal cortex is centrally involved in this control of spatial attention. We examined brain activity during attention shifts using rapid, event-related fMRI of human observers as they covertly shifted attention between two peripheral spatial locations. Activation in extrastriate cortex increased after a shift of attention to the contralateral visual field and remained high during sustained contralateral attention. The time course of activity was substantially different in posterior parietal cortex, where transient increases in activation accompanied shifts of attention in either direction. This result suggests that activation of the parietal cortex is associated with a discrete signal to shift spatial attention, and is not the source of a signal to continuously maintain the current attentive state.
@article{ Yantis_etal02,
  author = {Yantis S, Schwarzbach J, Serences JT, Carlson RL, Steinmetz MA, Pekar
	JJ, Courtney SM.},
  title = {Transient neural activity in human parietal cortex during spatial
	attention shifts},
  journal = {Nature Neuroscience},
  year = {2002},
  volume = {5},
  pages = {995-1002},
  number = {10},
  month = {Oct},
  abstract = {Observers viewing a complex visual scene selectively attend to relevant
	locations or objects and ignore irrelevant ones. Selective attention
	to an object enhances its neural representation in extrastriate cortex,
	compared with those of unattended objects, via top-down attentional
	control signals. The posterior parietal cortex is centrally involved
	in this control of spatial attention. We examined brain activity
	during attention shifts using rapid, event-related fMRI of human
	observers as they covertly shifted attention between two peripheral
	spatial locations. Activation in extrastriate cortex increased after
	a shift of attention to the contralateral visual field and remained
	high during sustained contralateral attention. The time course of
	activity was substantially different in posterior parietal cortex,
	where transient increases in activation accompanied shifts of attention
	in either direction. This result suggests that activation of the
	parietal cortex is associated with a discrete signal to shift spatial
	attention, and is not the source of a signal to continuously maintain
	the current attentive state. },
  en_number = { }
}
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