Prefrontal GABAergic Synaptic Plasticity Regulates Cognitive Flexibility

Cognitive flexibility, the ability to adapt thoughts and behaviors to new or changing situations, is a critical executive function. Deficits in this capacity are a common and debilitating feature across a range of neurological and psychiatric disorders, including Alzheimer's disease, obsessive-compulsive disorder, and chemotherapy-induced cognitive impairment [1, 2, 3]. Clinically, this often manifests as perseveration, the persistent repetition of an action or thought despite a change in context, which severely impacts a patient's functional independence [2]. While current interventions such as cognitive training or neuromodulation offer some benefit [4, 5, 6], developing more targeted therapies requires a deeper understanding of the underlying neural circuitry. The prefrontal cortex is known to be a key hub for this type of cognitive control [7]. A recent study now provides a more granular view, identifying plasticity at long-range inhibitory synapses from prefrontal parvalbumin-expressing (PV) neurons onto corticothalamic neurons as a specific regulator of cognitive flexibility [8, 9].