Information content and temporal structure of face selective local field potentials frequency bands in IT cortex
Atena Sajedin1, Sina Salehi2, Hossein Esteky3
1Department of Electrical Engineering, Amirkabir University of Technology, Tehran 15875441, Iran.
Cerebral Cortex (New York, N.Y. : 1991)
|November 27, 2023
Summary
Brain activity in the inferior temporal cortex shows category-selective responses to faces. Different frequency bands of local field potentials (LFPs) encode face information, with higher frequencies being more informative.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Systems Neuroscience
Background:
- Sensory stimuli evoke synchronized brain activity across various frequencies.
- Local field potentials (LFPs) serve as neural signatures for representing visual categories.
- The inferior temporal cortex is crucial for visual object and face recognition.
Purpose of the Study:
- To investigate the role of different local field potential (LFP) frequency oscillation bands in visual category representation.
- To determine how face-selective neural responses are represented across different LFP frequencies in the inferior temporal cortex.
Main Methods:
- Recorded LFPs from the inferior temporal cortex of three monkeys while presenting images of faces and objects.
- Analyzed LFP power and information content across various frequency bands (1-170 Hz).
- Examined the relationship between LFP responses, recording site location, and stimulus category selectivity.
Main Results:
- Category-selective LFP responses were found primarily for animate objects, especially faces.
- Face-selective responses occurred across all tested LFP frequency bands, showing both enhancement and suppression.
- Low-frequency LFPs (1-30 Hz) showed more suppression and conveyed less face category information compared to high-frequency LFPs (30-170 Hz).
- A negative correlation was observed between face/object discriminability and anterior-posterior recording site position.
- Low-frequency LFP power decreased along the anterior-posterior axis, unlike high-frequency LFPs.
Conclusions:
- A balance of excitation and inhibition across different LFP frequencies and cortical space shapes face category selectivity in the inferior temporal cortex.
- High-frequency LFP bands are more critical for conveying detailed face category information.
- The spatial organization of the inferior temporal cortex influences the representation of visual categories.
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