The bilateral Left Cerebrum.Occipital Lobe.Middle Temporal Gyrus, as labeled in the Talairach 2 mm atlas, refers to voxels located within the middle portion of the temporal gyrus that lie adjacent to or functionally associated with occipital regions in the left hemisphere, typically near the temporo-occipital junction. Although structurally part of the temporal lobe, this territory is positioned to integrate higher-order visual information from the occipital lobe with auditory, language, and semantic processing streams characteristic of the middle temporal gyrus. Functionally, it contributes to multimodal object recognition, aspects of visual word and motion processing, and participation in the language network, including lexical-semantic access. There is no direct Wikipedia article for this exact composite Talairach label; a related structure is the Middle Temporal Gyrus.
The middle temporal gyrus in the occipital/temporo‑occipital region of the left cerebrum, as defined in the Talairach 2 mm atlas, has been implicated in multiple genetic and GWAS findings through its roles in language, semantic processing, and visual–lexical integration. Large neuroimaging genetics consortia (e.g., ENIGMA, UK Biobank) have identified common variants associated with cortical thickness and surface area in temporal and occipital regions, including loci near genes involved in neurodevelopment (such as MAPT, GRIN2B, and DCDC2), some of which overlap with risk loci for dyslexia, schizophrenia, and autism spectrum disorder, where altered activation and morphology of the middle temporal gyrus are frequently reported. GWAS of reading and language skills, educational attainment, and general cognitive ability have highlighted polygenic influences on temporal cortical structure and function, with several associated variants showing pleiotropic effects on related traits such as verbal IQ and phonological processing, consistent with the region’s central role in semantic and language networks. In psychiatric genetics, risk alleles for schizophrenia and major depressive disorder (including those in the MHC region and synaptic genes such as CACNA1C, GRM3, and others) have been linked to altered temporal–occipital connectivity and volume in imaging–genetics studies, suggesting that genetic vulnerability may partly act through perturbation of this association cortex. Additionally, APOE and other Alzheimer’s disease risk variants show structural and functional effects in temporal regions including the middle temporal gyrus, aligning with early involvement of temporo‑occipital cortices in semantic memory decline. Overall, while few loci are uniquely specific to the bilateral left middle temporal gyrus as defined by Talairach labels, convergent GWAS and imaging‑genetics work indicate that polygenic variation influencing neurodevelopment, synaptic signaling, and neurodegeneration contributes to individual differences and disease‑related changes in this region’s structure and function.
Overview generated by GPT-4o (2026).
Region ID: 556
Hemisphere: bilateral
Atlas: Talairach labels 2mm
Full Quality Version: Download MP4
Full Quality Version: Download MP4
Wali Sidiqyar*, Gaurav Rudravaram*, Elyssa M. McMaster, Trent M. Schwartz, Adam M. Saunders, Kurt G. Schilling, Bennett A. Landman "Introducing SPINS: A Shared Public Visualization Library of Neuroanatomical Structures." Medical Imaging with Deep Learning- short paper
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