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Thalamic relay functions.

¹Department of Neurobiology, Department of Physiology, State University of New York, Stony Brook, NY 11794-5230, USA. s.sherman@sunysb.edu

Progress in Brain Research

|November 13, 2001

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The lateral geniculate nucleus (LGN) dynamically controls visual information relay based on behavioral state. Nonretinal inputs modulate LGN relay cells, influencing visual attention and information processing in the brain.

Area of Science:

Neuroscience
Visual System
Thalamic Relays

Background:

The lateral geniculate nucleus (LGN) is a primary thalamic relay for visual information.
Retinal input constitutes only 5-10% of LGN relay cell inputs; the majority are modulatory.

Purpose of the Study:

To investigate the role of nonretinal, modulatory inputs in controlling LGN relay function.
To explore the hypothesis that LGN dynamic control is linked to behavioral state and visual attention.

Main Methods:

Studies focused on the lateral geniculate nucleus of the cat.
Analysis of retinal, cortical, and brainstem inputs to LGN relay cells.

Main Results:

Nonretinal inputs significantly modulate LGN relay cell membrane properties and response modes.

Related Experiment Videos

This modulation dramatically alters the nature of visual information relayed to the cortex.

The pulvinar (and lateral posterior nucleus) functions as a higher-order relay, involved in corticocortical processing.

Conclusions:

Dynamic control of the LGN relay by nonretinal inputs is crucial for visual attention.
The thalamus plays an indispensable role in corticocortical processing via re-entry routes.