Fig. 3.

Place fields from seven identified pyramidal neurons across the entire behavioral sequence from a CPP-injected rat. Format is the same as in Fig. 2. Note that most neurons with fields in the inner box (e.g., cells 1–3) maintained firing position throughout the experiment, whereas cell 4, which remapped in response to barrier removal in O1, remapped again in O2, consistent with the known effects of CPP on remapping. All outer box firing fields remapped between sessions O1 and O2, even those of cells (2 and 3) with stable inner box fields, which resulted in midrange stability scores for the entire environment.