▁are ▁most ▁commonly ▁used ▁in ▁cogn itive ▁ther apy . ▁ ▁They ▁are ▁commonly ▁assigned ▁as ▁home work ▁by ▁ther ap ists ▁in ▁order ▁to ▁help ▁posit ively ▁impact ▁individuals ▁who ▁are ▁experien cing ▁d ys ph oria ▁or ▁de pression . ▁However , ▁these ▁tools ▁can ▁also ▁be ▁used ▁for ▁individuals ▁experien cing ▁temporary ▁unw anted ▁m ood s . ▁Many ▁factors ▁go ▁into ▁the ▁effect iveness ▁of ▁m ood ▁repair ▁strateg ies ▁on ▁an ▁individual ▁r anging ▁from ▁the ▁client ' s ▁self - este em ▁to ▁their ▁experience ▁with ▁the ▁strategy ▁being ▁used . ▁Even ▁the ▁way ▁the ▁m ood ▁repair ▁strategy ▁is ▁presented ▁( e ither ▁to ▁avoid ▁negative ▁m ood s ▁or ▁to ▁purs ue ▁positive ▁m ood s ) ▁may ▁have ▁an ▁effect ▁on ▁that ▁strategy ' s ▁ability ▁to ▁improve ▁m ood . ▁ ▁Background ▁M ood ▁repair ▁strateg ies ▁have ▁existed ▁in ▁a ▁cas ual ▁and ▁uns cient ific ▁way ▁for ▁basically ▁all ▁of ▁modern ▁human ▁history ▁due ▁to ▁general ▁affect ▁and ▁the ▁desire ▁to ▁change ▁that ▁affect ▁when ▁it ▁is ▁negative . ▁ ▁Gener ally ▁the ▁techniques ▁could ▁be ▁considered ▁" common ▁knowledge " ▁but ▁these ▁techniques ▁were ▁un expl ored ▁in ▁research . ▁ ▁Con cept s ▁such ▁as ▁" th ink ▁happy ▁thoughts " ▁and ▁" don ' t ▁listen ▁to ▁sad ▁music " ▁are ▁commonly ▁pres cribed ▁by ▁friends ▁or ▁family ▁to ▁those ▁suffering ▁in ▁negative ▁m ood s . ▁ ▁What ▁remained ▁to ▁be ▁seen ▁though , ▁was ▁how ▁the