Lecture9-M23,M24

Explana5on

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: r recall#for#episodes,#only#goes#back#to#about age#3#for#most#people. This#nearly#3Eyear#“blank”#in#our#memories has#been#called#infan=le'amnesia. Explana5on? • Encoding:#the#memories#were#not#stored#well#because#the hippocampus#is#one#of#the#last#brain#areas#to#develop. • Forgetng/retrieval:#the#adult#mind#thinks#more#in#a#linear verbal#narra5ve#and#has#trouble#accessing#preverbal memories#as#declara5ve#memories. Emo=ons'and'Memory Strong#emo5ons,#especially stress,#can#strengthen memory#forma5on. Flashbulb'memories'refer to#emo5onally#intense events#that#become “burned#in”#as#a#vividE seeming#memory. Note'that'flashbulb memories'are'not'as accurate'as'they'feel. Vividly#storing#informa5on about#dangers#may#have helped#our#ancestors survive. Emo=ons,'Stress'Hormones, the'Amygdala,'and'Memory How#does#intense#emo5on#cause the#brain#to#form#intense memories? 1.Emo5ons#can#trigger#a#rise#in stress#hormones. 2.These#hormones#trigger#ac5vity in#the#amygdala,#located#next#to the#memoryEforming hippocampus. 3.The#amygdala#increases memoryEforming#ac5vity#and engages#the#frontal#lobes#and basal#ganglia#to#“tag”#the memories#as#important. As#a#result,#the#memories are#stored#with#more sensory#and#emo5onal details. These#details#can#trigger#a rapid,#unintended#recall#of the#memory. Trauma5zed#people#can have#intrusive#recall#that#is so#vivid#that#it#feels#like#reE experiencing#the#event. Brain!processing!of!memory Synap=c'Changes When#sea#slugs#or#people#form#memories, their#neurons#release#neurotransmiSers#to other#neurons#across#the#synapses,#the junc9ons,between,neurons. With#repe55on,#the#synapses#undergo#longDterm'poten=a=on; signals,are,sent,across,the,synapse,more,efficiently. Synap5c#changes#include#a#reduc5on#in#the#promp5ng#needed to#send#a#signal,#and#an#increase#in#the#number#of neurotransmiSer#receptor#sites#(below,#right) LongDTerm'Poten=a=on'(LTP) Presynaptic cell Postsynaptic cell Presynaptic cell Postsynaptic cell Messing'with'LongDTerm'Poten=a=on Chemicals#and#shocks#that prevent#longEterm#poten5a5on (LTP)#can#prevent#learning#and even#erase#recent#learning. Preven5ng#LTP#keeps#new memories#from#consolida5ng into#longEterm#memories.#For example,#mice#forget#how#to run#a#maze. Drugs#that#boost#LTP#help#mice learn#a#maze#more#quickly#and with#fewer#mistakes. Summary: 'Types'of'Memory'Processing...
View Full Document

This note was uploaded on 04/07/2014 for the course PSYCH 10 taught by Professor Zaidel during the Winter '08 term at UCLA.

Ask a homework question - tutors are online