▁which ▁is ▁responsible ▁for ▁many ▁fight - or - fl ight ▁responses . ▁The ▁mus cle ▁cells ▁connected ▁to ▁the ▁hair ▁fol lic le ▁have ▁been ▁visual ized ▁by ▁act in ▁imm un of lu ores c ence . ▁ ▁As ▁a ▁response ▁to ▁cold ▁▁ ▁In ▁animals ▁covered ▁with ▁fur ▁or ▁hair , ▁the ▁ere ct ▁hair s ▁trap ▁air ▁to ▁create ▁a ▁layer ▁of ▁ins ulation . ▁ ▁Go ose ▁b umps ▁can ▁also ▁be ▁a ▁response ▁to ▁anger ▁or ▁fear : ▁the ▁ere ct ▁hair s ▁make ▁the ▁animal ▁appear ▁larger , ▁in ▁order ▁to ▁int im id ate ▁enemies . ▁This ▁can ▁be ▁observed ▁in ▁the ▁int im id ation ▁displays ▁of ▁ch imp anze es , ▁some ▁New ▁World ▁mon keys ▁like ▁the ▁cot ton - top ▁t amarin , ▁in ▁str essed ▁m ice ▁and ▁r ats , ▁and ▁in ▁fright ened ▁c ats . ▁ ▁In ▁humans ▁▁ ▁In ▁humans , ▁go ose ▁b umps ▁can ▁even ▁extend ▁to ▁p ilo ere ction ▁as ▁a ▁reaction ▁to ▁hearing ▁n ails ▁scratch ▁on ▁a ▁ch alk board , ▁listening ▁to ▁a we - in sp iring ▁music , ▁or ▁feeling ▁or ▁remember ing ▁strong ▁and ▁positive ▁emot ions ▁( e . g ., ▁after ▁winning ▁a ▁sports ▁event ), ▁or ▁while ▁watching ▁a ▁horror ▁film . ▁ ▁Some ▁can ▁deliber ately ▁e voke ▁go ose ▁b umps ▁in ▁themselves ▁without ▁any ▁external ▁trigger . ▁Such ▁people ▁tend ▁to ▁have ▁the ▁ability ▁to ▁increase ▁their ▁heart ▁rate ▁and