Psychedelics alter sensory perceptions, disrupt self-referential thought, and can catalyze spiritual and existential experiences. As research advances, these substances are being integrated into therapeutic settings, challenging existing psychiatric models and offering new insights into consciousness and mental health. This emerging paradigm calls for careful regulation and ethical considerations, promising a more holistic approach to mental health disorders.
Depressed mice show reduced motivation to explore in a new behavioral test called the Multilevel Exploration Test (MET), which breaks exploration into search, attend/investigate, and approach phases. Activating a specific neural circuit from the prelimbic cortex to the zona incerta restored exploratory deficits and alleviated other depression-like behaviors. A machine learning model using MET data predicted individual emotional states—normal, anxiety-like, or depression-like—with over 92% accuracy. The MET offers a high-throughput way to study motivation-related brain mechanisms and may help identify new antidepressant targets.