We study the neurobiology of action in health and disease.

To study actions is to study the way we do things, which is different than studying how we remember stimuli, or facts and events. Some actions are innate or pre-wired (like swallowing, breathing, even grooming). Others are learned through trial and error throughout life. We currently focus on understanding the processes mediating the latter.

Our overall goal is to understand how changes in molecular networks in the brain modify neural circuits to produce experience-dependent changes in actions. In order to understand how actions are learned through trial and error, we subdivided our experiments in different components, or specific goals:

Action initiation: how do we initiate and generate diverse actions (trial),

Action improvement: how do we improve the accuracy and speed of actions (through trial and error), and.

Actions and outcomes: how do we learn that particular actions lead to particular outcomes (goal of the action) and how do we form habits.

Understanding how we automate actions and form habits will hopefully point us to the mechanisms underlying drug seeking in addiction.

A growing body of evidence supports an important role of the basal ganglia in action initiation and selection, in skill learning, and in learning goal-directed actions and habits. Therefore, we centered our efforts on investigating the cortico-basal ganglia mechanisms underlying these three processes using an across-level approach, from molecules to circuits.

We chose to implement this integrative approach in mice because they combine the power of genetics, a mammalian brain with canonical cortico-basal ganglia loops that can generate and propagate oscillatory activity, and the possibility of accurately quantifying simple behaviors like action initiation (with EMG recordings or using inertial sensors) and stereotypic skill learning, and more elaborate behaviors like goal-directed actions.

Our research program will hopefully shed light on the mechanisms underlying the diversity of actions we perform, the automatization of actions and the generalization rules or ways to do. Our research may also have important implications for understanding the relation between corticostriatal dysfunction and different neurodegenerative and psychiatric disorders.

                                    SC Lin @ 2006