Rhythmic neuronal synchronization in visual cortex entails spatial phase relation diversity that is modulated by...

Area of Science:

• Neuroscience
• Computational Neuroscience
• Systems Neuroscience

Background:

• Neuronal groups synchronize within specific frequency bands.
• Synchronization, defined by consistent phase relations over time, is modulated by sensory input and cognitive states.

Purpose of the Study:

• Investigate the diversity of spatial phase relations (SPHARED) in local field potentials (LFPs) and multi-unit activity (MUA) in primate area V4.
• Examine how visual stimulation and selective attention alter these phase relations, creating across-site-pair phase-relation-shift diversity (SPHARESD).

Main Methods:

• Recorded LFPs and MUA from area V4 of two monkeys during a selective visual attention task.
• Analyzed phase relations across neuronal site pairs to quantify SPHARED and SPHARED.
• Investigated reliability and modulations by visual stimuli and attention.

Main Results:

• Phase relations are diverse across site pairs (SPHARED) and this diversity is highly reliable.
• Visual stimulation and selective attention induce diverse shifts in phase relations (SPHARESD), which are also highly reliable.
• SPHARED observed for LFP-LFP, LFP-MUA, and MUA-MUA pairs; stimulus-induced SPHARED for LFP-LFP and LFP-MUA; attention-induced SPHARED for LFP-LFP pairs.

Conclusions:

• Spatial phase relation diversity (SPHARED) is a fundamental property of neuronal activity in area V4.
• SPHARED and SPHARED are reliable and dynamically modulated by sensory and cognitive factors.
• SPHARESD is a significant factor influencing downstream neuronal activity.