Kevin M Spiegler's research while affiliated with Rutgers, The State University of New Jersey and other places

... One focus has been on change in self-esteem trajectories across adolescence at both the group mean and individual level, (57,58) with pronounced decreases specifically seen in girls. (59) Studies have also documented increases across development in self-consciousness,(60,61) self-complexity, (62,63) and self-disclosure. (64) Other research has suggested that mentalizing (cognitive perspective-taking) also continues to improve, as seen by increased accuracy and decreased reaction time on laboratory mentalizing tasks.(65-67) ...

... This is at least what suggests a study [47] who showed in mices that exercise combined with a sequence of enriched environment yielded an approximately 30% greater increase in new neurons than either stimulus alone. On their side, Smith and colleagues [48] reported that exercise combined with cognitive training resulted in a greater cognitive improvement in mices than either stimulus alone, thus suggesting that adaptations reported by Fabel et al. [47] may have functional consequences on these animals. Results are more equivocal in humans, since recent narrative reviews [49][50][51], systematic reviews [52][53][54], and meta-analyses [55][56][57][58][59] have reported conflicting results. ...