Spatial Attention Modulates Neuronal Interactions between Simple and Complex Cells in V1

Area of Science:

• Neuroscience
• Visual Perception
• Cognitive Neuroscience

Background:

• Spatial attention selectively prioritizes visual information, influencing neuronal communication across hierarchical visual cortices.
• The primary visual cortex (V1) exhibits hierarchical connections between simple (S) and complex (C) cells.

Purpose of the Study:

• To investigate how spatial attention modulates neuronal communication within V1, specifically between S-C cell pairs with heterogeneous visual input.
• To explore attentional modulation of neuronal interactions using Granger causality analysis.

Main Methods:

• Simultaneous electrophysiological recordings from macaque monkey V1 during a spatial attention task.
• Application of likelihood-based Granger causality analysis to quantify neuronal interactions.
• Analysis of communication strength in S-C cell pairs under different attentional conditions.

Main Results:

• A significant attention-related decrease in Granger causality was observed in S-C pairs, primarily in the S-to-C feedforward connection.
• Feedforward connection strength exceeded feedback connection strength under attention-toward (AT) conditions.
• Differences in communication strength between target- and distractor-stimuli-covered neurons emerged only when attending to complex cells' receptive fields (RFs).
• Neuronal communication strength was dependent on the attentional modulation of individual neuron firing rates.

Conclusions:

• Spatial attention amplifies directed communication within V1 rather than inducing specific information flow patterns.
• The findings highlight the role of attention in modulating local neuronal interactions within the primary visual cortex.