Environmental context sculpts spatial and temporal visual processing in thalamus

Area of Science:

• Neuroscience
• Visual System Research
• Sensory Processing

Background:

• Behavioral state, driven by arousal, influences neural activity in the visual system.
• While internal factors affecting visual processing are well-studied, the impact of external environmental contexts is less understood.

Purpose of the Study:

• To investigate how different environmental contexts affect visual processing in the thalamus.
• To determine if environmental context influences visual processing independently of arousal levels.

Main Methods:

• Recordings were made in the dorsal lateral geniculate nucleus (dLGN) of awake, head-fixed mice.
• Mice were exposed to two contexts: a stationary tube and a running wheel enabling locomotion.
• Arousal metrics were measured to control for internal state variations.

Main Results:

• The running wheel context, compared to the tube, showed elevated baseline activity and faster, less spatially selective visual responses in the dLGN.
• These context-dependent differences in visual processing vanished when locomotion was prevented on the wheel.
• This suggests environmental context, not just arousal, influences early visual processing.

Conclusions:

• The physical environment plays an unexpected role in fundamental aspects of early visual processing.
• Locomotion-enabling contexts can alter neural processing in the dLGN, even when arousal is controlled.
• Environmental context is a critical factor to consider in understanding visual perception.