Light-Dark Box Test

The light-dark box (also called the light-dark transition test) exploits the natural conflict between rodent exploratory drive and innate aversion to brightly illuminated open spaces. The apparatus consists of two interconnected compartments: a large, brightly lit open chamber and a smaller, enclosed dark chamber. Anxious animals spend proportionally more time in the dark compartment, while anxiolytic drugs increase exploration of the light side. This paradigm is one of the simplest and most rapidly conducted anxiety tests, requiring no prior training or food deprivation.

Principal dependent variables include time spent in the light compartment, number of light-dark transitions (reflecting general locomotor activity and risk assessment), latency to first enter the light compartment (if started in dark), and distance traveled in each compartment. Secondary measures include rearing events in the light, stretch-attend postures at the doorway, and the spatial distribution of exploration within the light chamber (center vs. periphery).

ConductMaze controls ambient illumination levels independently in each compartment via programmable LED arrays, monitors animal position using infrared-compatible overhead tracking that functions in both lit and dark chambers, and detects compartment transitions through beam-break sensors at the connecting doorway. The system computes all anxiety indices automatically, including time-binned analysis for tracking within-session habituation or drug onset effects.