Single-Trial Decoding of Visual Attention from Local Field Potentials in the Primate Lateral Prefrontal Cortex Is...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Primate Research

Background:

• Local field potentials (LFPs) are extracellular voltage fluctuations reflecting neural activity.
• Spatial attention modulates LFPs in visual areas, but effects in executive regions like the lateral prefrontal cortex (LPFC) are less understood.
• The LPFC is crucial for the origins of attention.

Purpose of the Study:

• To investigate whether and how attention modulates LFPs in the LPFC.
• To determine if LFPs can decode attention allocation in executive brain areas.
• To compare LFP information with single-neuron spiking activity.

Main Methods:

• Recording LFPs from multielectrode arrays implanted in the LPFC of two macaques.
• Decoding attention allocation using different LFP frequency bands.
• Comparing LFP decoding performance with single-neuron spiking activity.
• Analyzing the effect of signal decorrelation on decoding performance.

Main Results:

• Attention allocation was reliably decoded from high-frequency LFPs (>60 Hz) on a single-trial basis.
• Low-frequency LFPs (<60 Hz) decoded visual stimulus location and saccade endpoints, not attention.
• Information in high-frequency LFPs was redundant with spiking activity but offered greater temporal stability.
• Decorrelating LFP signals improved high-frequency decoding performance by ~14%.

Conclusions:

• LFPs in the LPFC contain task-related information (sensory, cognitive, motor) in a frequency-dependent manner.
• High-frequency LFPs are valuable for decoding cognitive states like attention.
• LFP analysis, particularly with decorrelation techniques, provides complementary insights to spike-based analyses in executive brain regions.