Common neuroscience tests used to study memory in mice might actually just be measuring how well a mouse can point its body in a certain direction.
April 1, 2026
Original Paper
Quantifying nonmnemonic strategies in two-alternative forced choice delayed matching and nonmatching-to-position tasks in mice (Musmusculus) using automated video tracking technologies
PsyArXiv · fqajn_v2
The Takeaway
Standard 'working memory' tasks assume mice are remembering a location in their heads, but automated video tracking reveals they often just point their nose at the correct spot and hold that physical position during the wait. This implies that decades of research on memory-enhancing drugs might have actually been measuring physical posture rather than brain power.
From the abstract
Delayed matching-to-position (DMTP) and delayed nonmatching-to-position (DNMTP) tasks are widely used as standard paradigms for evaluating working memory in rodents. In these tasks, which employ a two-alternative forced choice (2AFC) design, animals initiate each trial by nosepoking a back key, which triggers the illumination of a sample key (either the left or right front key). Upon nosepoking the sample key, a delay interval begins, during which the back key remains illuminated, requiring cont