predict able ▁c ages ▁d rank ▁a ▁greater ▁proportion ▁of ▁the ▁an xi ol yt ic ▁solution ▁than ▁m ice ▁from ▁en rich ed ▁c ages , ▁indicating ▁that ▁m ice ▁from ▁the ▁standard ▁and ▁un predict able ▁labor atory ▁c aging ▁may ▁have ▁been ▁experien cing ▁greater ▁anx iety ▁than ▁m ice ▁from ▁the ▁en rich ed ▁c ages . ▁ ▁Sp ind le ▁neur ons ▁Sp ind le ▁neur ons ▁are ▁special ised ▁cells ▁found ▁in ▁three ▁very ▁restricted ▁regions ▁of ▁the ▁human ▁brain ▁ ▁– ▁the ▁anterior ▁c ing ulate ▁cor tex , ▁the ▁fr onto ins ular ▁cor tex ▁and ▁the ▁d ors ol ater al ▁pre front al ▁cor tex . ▁ ▁The ▁first ▁two ▁of ▁these ▁areas ▁reg ulate ▁emot ional ▁functions ▁such ▁as ▁em path y , ▁speech , ▁intu ition , ▁rapid ▁" g ut ▁re actions " ▁and ▁social ▁organization ▁in ▁humans . ▁Sp ind le ▁neur ons ▁are ▁also ▁found ▁in ▁the ▁bra ins ▁of ▁hum p back ▁wh ales , ▁fin ▁wh ales , ▁k iller ▁wh ales , ▁s perm ▁wh ales , ▁bott len ose ▁dol ph in , ▁Ris so ' s ▁dol ph in , ▁bel uga ▁wh ales , ▁and ▁the ▁African ▁and ▁Asian ▁ele ph ants . ▁ ▁Wh ales ▁have ▁sp ind le ▁cells ▁in ▁greater ▁numbers ▁and ▁are ▁maintained ▁for ▁twice ▁as ▁long ▁as ▁humans . ▁The ▁exact ▁function ▁of ▁sp ind le ▁cells ▁in ▁wh ale ▁bra ins ▁is ▁still ▁not ▁understood ,