期刊
JOURNAL OF NEUROSCIENCE
卷 27, 期 1, 页码 93-97出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3162-06.2007
关键词
spatial attention; contrast; fMRI; vision; additive; functional imaging
资金
- PHS HHS [NEI 12925] Funding Source: Medline
Previous electrophysiology data suggests that the modulation of neuronal firing by spatial attention depends on stimulus contrast, which has been described using either a multiplicative gain or a contrast-gain model. Here we measured the effect of spatial attention on contrast responses in humans using functional MRI. To our surprise, we found that the modulation of blood oxygenation level-dependent (BOLD) responses by spatial attention does not greatly depend on stimulus contrast in visual cortical areas tested [V1, V2, V3, and MT + (middle temporal area)]. An additive model, rather than a multiplicative or contrast-gain model best describes the attentional modulations in V1. This inconsistency with previous single-unit electrophysiological data has implications for the population-based neuronal source of the BOLD signal.
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