HUMAN MEMORY stage theory: Long Term and Short Term Memory -(note: Short Term Memory = "Working Memory") duration Long Term Memory: relatively permanent.

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Presentation transcript:

HUMAN MEMORY stage theory: Long Term and Short Term Memory -(note: Short Term Memory = "Working Memory") duration Long Term Memory: relatively permanent Short Term Memory: seconds to minutes storage capacity Long Term Memory: infinite? Short Term Memory: 7+/-2 "chunks" (organized packets of information)

flow of information in memory -stimulus -> STM -> rehearsal* -> LTM *two kinds of rehearsal: maintenance - holds info in STM elaborative - moves info to LTM

Fig. 7.1 Elaborative Maintenance Rehearsal Retrieval

serial position effect in free recall task: read 20 words one at a time, recall in any order primacy effect - early part of list recalled better than middle: recalled from LTM recency effect - last part of list recalled better than middle: recalled from STM reduce recency: delay between 20th word and recall reduce primacy: present words faster

Fig. 7.2

Fig. 7.3

Fig. 7.4

The Serial-Position Effect Subjects memorized lists of words Recall immediate (yellow line) or delayed (green line) Primacy: Good recall of first items on list Recency: Good recall for last items

FURTHER DIFFERENCES BETWEEN STM & LTM psychological code -STM: phonological - based on speech sounds confuse "boat" with "coat" -LTM: semantic - based on meaning confuse "boat" with "ship"

FURTHER DIFFERENCES BETWEEN STM & LTM neural code STM: dynamic - pattern of activity among a group of cells LTM: structural - pattern of connections within a group of cells "trace consolidation" is what goes on during elaborative rehearsal - a memory trace changes from a dynamic to a structural pattern -amnesia - interruption of consolidation process -retrograde amnesia for events BEFORE trauma -anterograde amnesia for events AFTER trauma

FURTHER DIFFERENCES BETWEEN STM & LTM forgetting STM: DISplacement and/or decay LTM: MISplacement and/or retrieval failure -proactive interference: old info affects new -retroactive interference: new info affects old

Interference and Forgetting

WORKING MEMORY: STM not just storage box; more like cognitive "workbench" limit on storage capacity is viewed instead as limit on processing capacity used in all processing of information: mental calculation, reading, etc. (16 x 231=?)