“…Our focus is primarily on the Gq‐coupled 5‐HT 2A R and Gi‐coupled 5‐HT 1A R pathways, and we will only briefly discuss the contributions of Gs‐coupled CRFR 1 and CRFR 2 receptors, which have been the focus of other reviews. Early stress causes alterations at multiple levels of organization spanning from molecular changes that include altered gene expression sustained via epigenetic modifications [30,37,106], cellular changes spanning from altered spine density to global dendritic architecture [46], functional and network level alterations measured predominantly via electrophysiological studies [67,73,100], and behavioral changes that are noted across a gamut of anxio‐depressive behaviors [35,107–109], fear conditioning responses [35,110–112], hallucinogen‐mediated HTR [67,113,114], sensorimotor gating [38,59,60], social approach‐avoidance behavior [35,115,116], and cognitive performance [35,65,73] (Fig. 2).…”