marginally significantp < 0.05
marginally insignificantp = 0.06
RN neurons exhibited a unimodal distribution that was marginally insignificant (unimodal Rayleigh test, p = 0.06, r = 0.31, PTD = 288°), whereas the bimodal distribution was marginally significant (Figure 6A ; bimodal Rayleigh test, p < 0.05, r = 0.33, PTD axes = 123–303°).