Journal
JOURNAL OF NEUROSCIENCE
Volume 30, Issue 9, Pages 3287-3296Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.6025-09.2010
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Funding
- National Eye Institute [EY-12106]
- Vision Core [EY12196]
- Medical Scientist Training Program [T32 GMO7753-26]
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In the visual system, spatial attention enhances sensory responses to stimuli at attended locations relative to unattended locations. Which brain structures direct the locus of attention, and how is attentional modulation delivered to structures in the visual system? We trained monkeys on an attention-switch task designed to precisely measure the onset of attentional modulation during rapid shifts of spatial attention. Here we show that attentional modulation appears substantially earlier in the lateral intraparietal area (LIP) than in an anatomically connected lower visual area, the middle temporal area. This temporal sequence of attentional latencies demonstrates that endogenous changes of state can occur in higher visual areas before lower visual areas and satisfies a critical prediction of the hypothesis that LIP is a source of top-down attentional signals to early visual cortex.
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