Core Viewpoint - The recent study by the Military Medical Research Institute reveals complex cognitive processes in simple rodent depression tests, providing new insights into the cognitive mechanisms underlying depressive-like behaviors [1][6]. Group 1: Research Background - The study focuses on advancements in understanding the neural circuits and molecular mechanisms related to mental disorders, particularly depression, using rodent models [3]. - Traditional methods like Forced Swim Test (FST) and Tail Suspension Test (TST) have been widely used to assess depressive-like behaviors in rodents, but they have limitations in capturing cognitive distortions and information processing anomalies [3][4]. Group 2: Methodology and Findings - The research team developed an automated tool called Swim Struggle Tracker (SST) to capture behavioral trajectories with fine temporal resolution and analyze the cognitive processes driving these behaviors through computational modeling [4]. - Results indicate that behaviors in FST and TST follow reinforcement learning principles, with different cognitive processes involved in each test, challenging the assumption that these tests can be interchangeably used for cross-validation [4][6]. - Regression analysis identified distinct behavioral phases, showing that early behaviors are influenced more by learning-related factors, while later stages are more sensitive to consequences, suggesting traditional analyses may underestimate the role of learning [4][6]. Group 3: Implications - The study emphasizes the importance of analyzing complete behavioral trajectories to understand depressive-like behaviors better and provides a theoretical foundation for developing more precise animal behavior analysis methods and antidepressant treatment strategies [6].