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Differential impact of endogenous and exogenous attention on activity in human visual cortex

Abstract : How do endogenous (voluntary) and exogenous (involuntary) attention modulate activity in visual cortex? Using ROI-based fMRI analysis, we measured fMRI activity for valid and invalid trials (target at cued/un-cued location, respectively), pre-or post-cueing endogenous or exogenous attention, while participants performed the same orientation discrimination task. We found stronger modulation in contralateral than ipsilateral visual regions, and higher activity in valid-than invalid-trials. For endogenous attention, modulation of stimulus-evoked activity due to a pre-cue increased along the visual hierarchy, but was constant due to a post-cue. For exogenous attention, modulation of stimulus-evoked activity due to a pre-cue was constant along the visual hierarchy, but was not modulated due to a post-cue. These findings reveal that endogenous and exogenous attention distinctly modulate activity in visuo-occipital areas during orienting and reorienting; endogenous attention facilitates both the encoding and the readout of visual information whereas exogenous attention only facilitates the encoding of information.
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https://hal-univ-paris.archives-ouvertes.fr/hal-03043648
Contributor : Laura Dugué <>
Submitted on : Monday, December 7, 2020 - 1:28:45 PM
Last modification on : Wednesday, April 21, 2021 - 3:31:32 AM
Long-term archiving on: : Monday, March 8, 2021 - 7:02:16 PM

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Laura Dugué, Elisha Merriam, David Heeger, Marisa Carrasco. Differential impact of endogenous and exogenous attention on activity in human visual cortex. Scientific Reports, Nature Publishing Group, 2020, 10 (1), ⟨10.1038/s41598-020-78172-x⟩. ⟨hal-03043648⟩

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