Training Mice to Perform Attentional Set-Shifting Under Head Restraint.

Cognitive flexibility is a process that involves dynamically adapting behavior to obtain a desired series of outcomes during continuously changing stimulus-response-reward associations. Attentional set-shifting is a multi-modal decision-making paradigm that tests cognitive flexibility, which can be useful for investigating neural circuitry that is disrupted in multiple neuropsychiatric disorders, including schizophrenia, Alzheimer's disease, depression, and addiction. The canonical human attentional set-shifting paradigm for measuring cognitive flexibility is the Wisconsin Card Sorting Test, in which subjects sort cards based on rules that change periodically and adapt their behavior by utilizing feedback in the form of correct and incorrect outcomes. To transfer these tests to rodent models, previous techniques involved attentional set-shifting paradigms in free-roaming test chambers, in which animals associated cues with reward locations. The protocol presented here involves an analogous attentional set-shifting paradigm, in which water-restricted mice are head-restrained on a platform and must keep track of periodically switching stimulus-response-outcome associations. The mice must learn to associate odor or whisker vibration cues with a binary directional lick response that triggers water delivery. The mice are trained to respond by licking one of two spouts, in which the correct decision is dependent on the current stimulus rule. This protocol allows for behaviorally measuring cognitive flexibility alongside neural activity by pairing the head-restrained paradigm with 2-photon calcium imaging, optogenetics, and extracellular and intracellular physiology. Key features • Head-restraint design that allows for optogenetic manipulation, in vivo imaging, extracellular and intracellular electrophysiology, and other manipulations. • Attentional set-shifting paradigm that measures cognitive flexibility in rodents.