Many of us will recognize being in a situation where it’s really hard to get started on a task—whether it’s making a difficult phone call or preparing a presentation that’s stressful just to think about. We understand what needs to be done, yet taking that very first step feels surprisingly hard. When this difficulty becomes severe, it is known medically as avolition. People with avolition are not lazy or unaware. They know what they need to do, but their brains seem unable to push the “go” button. Avolition is commonly seen in conditions such as depression, schizophrenia, and Parkinson’s disease, and it can seriously disrupt a person’s ability to manage daily life and maintain social functions. Working with macaque monkeys trained to perform certain tasks, scientists at Kyoto University applied chemogenetics techniques to identify a pathway between the ventral striatum (VS) and ventral pallidum (VP) in the brain that functions as a “motivation brake,” suppressing this internal “go” button, particularly when facing stressful or unpleasant tasks. The results showed that chemogenetic suppression of this VS–VP pathway restored motivation in the animals under aversive conditions. The team, headed by Ken-ichi Amemori, PhD, an associate professor at the Institute for the Advanced Study of Human Biology (WPI-ASHBi), and colleagues, suggests that the discovery of this VS–VP motivation brake may shed light on conditions such as depression and schizophrenia, where severe loss of motivation is common, and point to interventional strategies. Amemori and colleagues reported on their findings in Current Biology, in a…
