Immunohistochemical detection of two neuronal populations involved in two different episodes of animal cognitive activity.

We developed a method to detect and superimpose neuronal populations involved in two different episodes of activity in the brain of single animal. This method is based on usage of two transcriptional factors with different accumulation curves, c-Fos and pCREB, as the markers. The overlap of neuronal populations involved in performance of spatial and nonspatial tasks in Morris water maze has been shown to occur at "chance" level.