Neuronal populations in left dorsolateral prefrontal cortex, left inferior parietal lobule, and left lateral temporal lobe

The neuronal populations in the left dorsolateral prefrontal cortex (dlPFC), left inferior parietal lobule (IPL), and left lateral temporal lobe (LTL) constitute a major functional network in the human brain primarily dedicated to language processing, semantic memory, and executive control (Binder et al., 2009; Friederici, 2011). The left dlPFC acts as a critical hub for executive functions such as working memory and attentional regulation, and it is the primary anatomical target for repetitive transcranial magnetic stimulation (rTMS) in the treatment of major depressive disorder (StatPearls, 2023). The left IPL and LTL are essential components of the semantic system, facilitating the integration of sensory information and the retrieval of conceptual knowledge (Binder et al., 2009). Pathological changes in these regions, such as cortical atrophy or metabolic decline, are hallmark features of neurodegenerative conditions like Alzheimer's disease and primary progressive aphasia (Thompson et al., 2003). In psychiatric disorders like schizophrenia, dysconnectivity between these nodes is often observed, contributing to cognitive and linguistic deficits (PubMed, 2022). While these populations are not molecular targets in the traditional sense (e.g., receptors or enzymes), they serve as focal points for both pharmacological interventions and direct physical neuromodulation (NIMH, 2023). Drugs targeting neurotransmitter systems, such as SSRIs or NMDA receptor antagonists, exert their therapeutic effects by modulating the activity and plasticity of these specific neuronal circuits.

Other names

Left-hemisphere semantic networkLeft-lateralized language networkLeft-hemisphere fronto-parieto-temporal network

These regions are modulated via the pharmacological regulation of neurotransmitter systems (e.g., serotonin, glutamate, acetylcholine) and through physical neuromodulation techniques such as repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS).