Cognitive and behavioural flexibility: neural mechanisms and clinical considerations

Cognitive and behavioural flexibility are essential executive functions that allow individuals to adapt their thoughts and actions to changing environmental demands. While often studied separately in cognitive psychology and behavioural neuroscience, these constructs are deeply intertwined. Cognitive flexibility involves switching between mental concepts, while behavioural flexibility refers to the adaptive adjustment of actions based on changing contingencies. Together, they form a critical component of goal-directed behaviour, enabling successful navigation of complex, evolving situations.

Research using non-invasive neuroimaging and animal models has identified a set of large-scale functional brain networks that underpin flexibility. The lateral frontoparietal network (L-FPN), often called the executive control network, and the midcingulo-insular network (M-CIN), sometimes referred to as the salience network, are central to these processes. These networks work in concert to manage attention, working memory, and inhibition. Recent advancements in dynamic functional connectivity analysis suggest that the brain's ability to transition between different functional states—rather than just static activation—is a key predictor of flexible performance. Higher levels of flexibility are associated with efficient reconfiguration of these networks, whereas inflexibility is linked to rigid or suboptimal brain dynamics.

Flexibility follows a protracted developmental trajectory, peaking in early adulthood and declining with age. Deficits in flexibility are transdiagnostic, appearing in neurodevelopmental disorders like autism spectrum disorder (ASD) and ADHD, adolescent-onset conditions like schizophrenia and mood disorders, and late-life dementias. While these conditions share common manifestations of rigidity or impulsivity, the underlying neural substrates and neurotransmitter systems—such as dopamine and serotonin—can vary. Understanding these differences is crucial for moving toward precision medicine, where interventions are tailored to an individual's specific neural and cognitive profile.