Skip to Main content Skip to Navigation
Journal articles

Visual stimulation quenches global alpha range activity in awake primate V4: a case study.

Abstract : Increasing evidence suggests that sensory stimulation not only changes the level of cortical activity with respect to baseline but also its structure. Despite having been reported in a multitude of conditions and preparations (for instance, as a quenching of intertrial variability, Churchland et al., 2010), such changes remain relatively poorly characterized. Here, we used optical imaging of voltage-sensitive dyes to explore, in V4 of an awake macaque, the spatiotemporal characteristics of both visually evoked and spontaneously ongoing neuro-nal activity and their difference. With respect to the spontaneous case, we detected a reduction in large-scale activity (cortical extent > 1 mm) in the alpha range (5 to 12.5 Hz) during sensory inflow accompanied by a decrease in pairwise correlations. Moreover, the spatial patterns of correlation obtained during the different visual stimuli were on the average more similar one to another than they were to that obtained in the absence of stimulation. Finally, these observed changes in activity dynamics approached saturation already at very low stimulus contrasts, unlike the progressive, near-linear increase of the mean raw evoked responses over a wide range of contrast values, which could indicate a specific switching in the presence of a sensory inflow.
Document type :
Journal articles
Complete list of metadatas

Cited literature [37 references]  Display  Hide  Download

https://hal-amu.archives-ouvertes.fr/hal-02329366
Contributor : Ivo Vanzetta <>
Submitted on : Wednesday, October 23, 2019 - 3:12:09 PM
Last modification on : Tuesday, June 23, 2020 - 10:46:02 AM
Long-term archiving on: : Friday, January 24, 2020 - 7:13:44 PM

File

NPh-004-031222.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

Thomas Deneux, Timothée Masquelier, Maria Bermudez, Guillaume Masson, Gustavo Deco, et al.. Visual stimulation quenches global alpha range activity in awake primate V4: a case study.. Neurophotonics, Society of Photo-optical Instrumentation Engineers (SPIE), 2017, 4 (3), pp.031222. ⟨10.1117/1.NPh.4.3.031222⟩. ⟨hal-02329366⟩

Share

Metrics

Record views

106

Files downloads

144