Thalamus - a central brain hub

In this comprehensive review, the authors offer an integrated overview of the thalamus — from its embryonic development and anatomical organization to its electrophysiological behavior and relevance in neurological disease. They begin by summarizing how thalamic nuclei form during early brain development and delineate the major functional cell types: excitatory projection neurons and inhibitory interneurons. The review highlights the distinct “burst” and “tonic” firing modes of projection neurons, suggesting how these modes regulate information flow depending on brain state, such as during sleep or wakefulness. 

The authors describe how the thalamus functions as a central relay hub, channeling sensory (visual, auditory, somatosensory), motor, and limbic signals toward cortex and other brain areas. Nuclei such as the ventral and dorsal tiers, including sensory-motor, geniculate, pulvinar, reticular and intralaminar nuclei, are mapped anatomically and functionally. Through these divisions, the thalamus supports a range of operations—processing of sensory input, modulation of arousal and consciousness, facilitating sleep rhythms, and contributing to cognition and emotion. 

Turning to clinical relevance, the review explores how thalamic dysfunction plays a role in various neurological and psychiatric disorders. Emphasis is placed on the use of neuromodulation techniques targeting thalamic nuclei — for example in drug-resistant epilepsy, movement disorders, psychiatric illness, and disorders of consciousness — illustrating the translational potential of thalamic research. The authors also reflect on current challenges: fragmentation of research across disease domains, lack of standardized data sharing, and limited cross-disciplinary integration. 

This article reinforces the thalamus’s pivotal role as a multifunctional brain hub, and calls for greater collaboration across neuroscience subfields to deepen understanding and expand therapeutic applications.