The Thalamic Synthesis of Consciousness (TSoC): A Neuroanatomical Theory of Unified Experience

Abstract

The Thalamic Synthesis of Consciousness (TSoC) theory proposes that unified consciousexperience arises from rhythmic thalamocortical integration of distributed cortical and subcorticalactivity. Rather than functioning as a passive relay, the thalamus is conceptualized as an activeintegrative hub that structures multimodal signals into discrete Consciousness Frames (CFs). CFsare transient attractor-like states in which sensory inputs, corticothalamic predictions, andcontextual signals are unified into a coherent, integrated moment of experience. CFs emerge through coordinated interaction of peripheral–thalamic (PT) inputs, cortico–thalamic(CT) feedback, and thalamo–cortical (TC) broadcasting, shaped by two complementary thalamicsystems. Within TSoC, the thalamic reticular nucleus (TRN) is proposed to provide precision andtemporal segmentation through biphasic cholinergic modulation, while the intralaminar nuclei(ILN) are proposed to support diffuse amplification and state-dependent gain. Both TRN and ILNare influenced by ascending reticular activating system (ARAS) activity, which is proposed tomodulate the initiation, stabilization, and termination of successive CFs. Sequences of CFs form a temporal scaffold underlying perception, episodic memory, and internallygenerated conscious content. TSoC accounts for temporal segmentation, generative memoryreconstruction, and state-dependent variation in perceptual clarity, while yielding falsifiablepredictions testable through electrophysiology, neuroimaging, lesion studies, and neuromodulation.A central prediction is that conscious experience unfolds in discrete thalamically mediated events,such that perceptual transitions—such as those occurring in binocular rivalry or the sound-inducedflash illusion—should align with temporally bounded electrophysiological states, including EEGmicrostates, and should be selectively perturbed by thalamic modulation. Correspondence: Alexander Radkiewicz, MD — alexander.radkiewicz@gmail.com