Task-dependent neural dynamics in hippocampal CA1 during auditory and visual perceptual decision-making in rats

Area of Science:

• Neuroscience
• Cognitive Science
• Decision-Making Research

Background:

• Perceptual decision-making integrates sensory evidence for behavior.
• The hippocampus's role across different sensory contexts is not well understood.

Purpose of the Study:

• Investigate hippocampal CA1 neural activity during visual and auditory decision-making tasks.
• Determine how anatomical pathways and neural dynamics differ across sensory modalities.

Main Methods:

• Viral neuronal tracing to map cortical projections to CA1.
• Touchscreen-based behavioral paradigms for visual and auditory tasks.
• In vivo multi-electrode recordings to analyze CA1 neural activity.

Main Results:

• Visual and auditory cortex projections to CA1 are largely segregated but overlapping.
• Auditory decision-making requires longer training and shows slower learning than visual decision-making.
• Hippocampal CA1 exhibits modality- and event-specific theta and beta oscillations, with differential single-neuron recruitment across tasks.

Conclusions:

• Hippocampal CA1 is flexibly engaged in both visual and auditory perceptual decision-making.
• Partially segregated inputs and task-dependent neural dynamics enable this flexibility.
• Findings highlight the hippocampus's adaptable role in integrating diverse sensory information for behavioral choices.