Cognitive Flexibility and Stress-Induced Neural Plasticity

Cognitive flexibility refers to the capacity to adapt behavioural strategies and thought processes in response to changing environmental demands or internal goals. It is a critical component of executive function and is supported by distributed neural circuits, notably within the prefrontal cortex and its interactions with limbic structures such as the hippocampus. Neural plasticity, the ability of synapses and neural circuits to undergo structural and functional modifications, underlies the acquisition and refinement of flexible cognitive skills. Exposure to acute and chronic stress can profoundly influence these plastic processes, yielding both adaptive and maladaptive outcomes. Stress hormones, including glucocorticoids, modulate synaptic strength and dendritic morphology, with effects that depend on stressor intensity, timing and individual hormonal status. At moderate levels, stress-induced plasticity may enhance vigilance and facilitate learning; however, prolonged or extreme stress often impairs prefrontal-dependent set-shifting, increases perseverative responding and disrupts long-term potentiation mechanisms in key regions such as the infralimbic cortex and hippocampal CA1. Understanding the balance between stress-driven enhancement and impairment of cognitive flexibility has wide-ranging implications for mental health, informing interventions in disorders characterised by rigid thought patterns, including depression, anxiety and post-traumatic stress disorder.

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Cognitive Flexibility and Stress-Induced Neural Plasticity publication trend

The graph below shows the total number of articles in cognitive flexibility and stress-induced neural plasticity across all publications each year (not limited to Nature Index journals).

Technical terms

Cognitive flexibility: The mental ability to switch between thinking about different concepts or to adjust behaviour in response to changing goals and environmental stimuli.

Neural plasticity: The capacity of neurons and synapses to change structurally or functionally in response to experience, learning or environmental challenges.

Extinction: A form of learning in which a conditioned response decreases after repeated non-reinforcement of a previously learned association.

Brain-Derived Neurotrophic Factor (BDNF): A protein that supports survival, growth and differentiation of neurons and modulates synaptic plasticity.

Long-Term Potentiation (LTP) and Long-Term Depression (LTD): Opposing processes of synaptic strengthening (LTP) and weakening (LTD) that underlie learning and memory.

Infralimbic cortex: A subregion of the medial prefrontal cortex involved in emotional regulation and extinction of conditioned responses.

Set-shifting: A behavioural task or process that measures the ability to shift attentional focus and adopt new rules when circumstances change.

References

1. Ventral Hippocampal Input to Infralimbic Cortex Is Necessary for the Therapeutic-Like Effects of Extinction in Stressed Rats. The International Journal of Neuropsychopharmacology (2023).
2. Bidirectional Optogenetically-Induced Plasticity of Evoked Responses in the Rat Medial Prefrontal Cortex Can Impair or Enhance Cognitive Set-Shifting. eNeuro (2019).
3. Infralimbic BDNF signaling is necessary for the beneficial effects of extinction on set shifting in stressed rats. Neuropsychopharmacology (2021).
4. Chronic corticosterone improves perseverative behavior in mice during sequential reversal learning. Behavioural Brain Research (2023).