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Lecture 5

Lecture 5- Feb 13.rtf

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Alison Luby

PSY100 MemoryFebruary 13 2012The Paradox of MemoryMemory the nervous systems capacity to acquire and retain usable skills and knowledgeOur memories are surprisingly good in some situations and surprisingly poor in others Memory can be surprisingly good In one study students saw 2560 photographs of objects for only a few seconds each There was a 93 recognition rate Sometimes these feats of memory are linked to autism Ex Kim Peek the inspiration for Rain ManThe Fallibility of MemoryIt can also be surprisingly bad Suggestive memory techniquesprocedures that strongly encourage patients to recall memories often create recollections that were not really there to begin with Memory illusion false but subjectively compelling memoryour brain goes beyond the information it has at its disposal to fill in the blanks and make meaning of information The Reconstructive Nature of MemoryWe actively reconstruct our memories using cues and information available to usWe do not passively reproduce them as if a movie is being replaced in our mindsMemories can be recalled from 3rd person as if someone was playing it back to youAttention We are being bombarded with sensory information all of the time Only if we attend to the sensory information will it get into the next memory system shortterm memory Selective Attentionselecting one sensory channel ignoringminimizing others The Reticular Activating System and the basal forebrain are involvedfilter theory of attentionWe screen incoming information only letting in the most important Change blindness the common failure to notice large changes in environments MemoryHM Patient HM had portions of his hippocampus surgically removedWhich appeared to destroy the mechanism that transfers info from STM to LTMHe could remember everything up to the surgery but nothing after He could still use implicit memory and improve on tasks involving practiceCan also keep info temporarily in working memoryWhen the hippocampus is damagedremoved explicit memory is impaired but impaired memory is Modal memory modelThe memory system shaw three stagesSensory memoryShortterm memoryLongterm memoryEach differs in terms of LSpan Sensory memoryvery brief storage of perceptual infoeach sense has its own form
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