A mouse study found that conditioned fear interfered with anxiety measurements. Diazepam’s effect depended on the experimental condition rather than appearing uniformly.
The researchers combined behavior, heart rate, and neuronal calcium measurements in fear-conditioned mice. Diazepam reduced basal anxiety-like behavior but did not produce the same effect during conditioned-stimulus presentation.
Other manipulations and recordings suggested that fear-related and anxiety-related responses interacted in ways that complicated interpretation.
An animal’s movement during a cue can reflect more than one process. A drug effect in the baseline condition does not establish that every later measure reflects the same underlying state.
Heart rate and calcium signals also are indirect measures rather than direct reports of subjective anxiety. The study cannot establish a human diagnostic distinction or predict an individual clinical response to diazepam. Its value is methodological: identify the task, timing, and competing behaviors before treating a positive or negative benzodiazepine response as a simple measure of anxiety.
Original analysis of the supplied journal article, identified as PMC6441152.