memory. what is memory? memory is a system that encodes, stores and retrieves information –process...
TRANSCRIPT
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Memory
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What is Memory?
• Memory is a system that encodes, stores and retrieves information
– Process by which information is taken in, converted to meaningful patterns and then saved until such time as it is needed
– E.g., expectancies stored associations between behaviors and consequences that drive behavior
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The Three Stages of Memory
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The three Stages of Memory
• Sensory Memory
• Working Memory
• Long-Term Memory
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Sensory Memory
• Real time capture of sensory stimuli– Iconic memory visual images– Echoic memory sounds
• Function Scan sensory information; select information to focus on and filter everything else out
• Capacity 12 – 16 items
• Duration .25 seconds
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Sensory Memory
• Sperling– Designed a study to examine the capacity of
the sensory store
– Briefly presented a stimulus array; ask subjects to:
• Report everything you see• Report on specific information
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D J B W
X H G N
T M L P
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Report everything you see
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X Q Y W
P L M G
S Q T V
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Report contents of second row
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Working (or Short-Term) Memory
• Mental work station
• Functions:– Selects information from sensory store on which to
focus attention– Temporary storage site for new information – Processes information so it can be transferred to
long-term memory
• Capacity 7 +/- 2
• Duration approx. 20 seconds
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Long-term Memory
• Function Permanent storage site for all types of information
• Capacity unlimited
• Duration unlimited
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Three Basic Tasks of Memory
• Encoding
• Storage
• Retrieval
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Encoding
• Process of transforming, coding, or sorting information so that it is in a useable form
– E.g., like a card catalog, encoding involves cross-referencing information under multiple categories
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Methods of Encoding
• Chunking putting multiple pieces of information together into meaningful groups; helps to expand the capacity of working memory
– E.g., Can you remember these numbers?
1 4 9 2 1 7 7 6 1 8 1 2
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Methods of Encoding
• Rehearsal– Maintenance rehearsal involves repeating
information over and over• Good for maintaining in STM but not useful for
transferring to LTM
– Elaborative rehearsal connecting new information with knowledge that is already stored
• Good for transferring information from STM to LTM
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Methods of Encoding
• Levels of Processing– Deeper processing results in better
remembering
• For example: encoding the word Horse– Visual (i.e., how it looks) -- It has a capital letter,
and is arranged cvccv.– Acoustic Sounds like course– Semantic an animal that eats hay that you can
ride.
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Storage• Process by which information is
maintained in long-term memory
• Divisions of LTM– Procedural memory for mental
directions or procedures
– Declarative memory for facts and events• Episodic Stores personal information;
memory for events in your life• Semantic Basic meanings of words and
concepts
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Retrieval
• Process by which information is accessed from long term memory so that is can be used or modified by new information
• Depends on how information was encoded and stored
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Factors Affecting Retrieval• Depth of Processing retrieval is better
– the more deeply information is processed– The more connections that have been formed with
existing information
• Retrieval Cues Stimuli that help to bring a memory to consciousness
• Encoding specificity The more closely the retrieval cues match the cues present at encoding, the more readily the information will be retrieved
• Mood biases retrieval of information that is mood-congruent
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Retrieval
• Implicit Recall – Memory that was not deliberately learned or was outside of conscious awareness
– Priming – process of providing cues that stimulate retrieval of implicit memories without awareness of connection between the cue and the retrieved memory
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Retrieval
• Explicit – Memory that has been processed with awareness and requires effort and conscious awareness
– Recall Must produce previously stored information (Short answer question)
– Recognition Identify stimulus as having been presented previously (i.e., multiple choice)
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H.M.
• Removed hippocampus and amygdala on both sides of brain to control severe epileptic seizures
• Result severe anterograde amnesia– Inability to form new memories– Unable to transfer information from short-term to long-
term memories
• Memory deficits are uniquely for declarative but not procedural memories
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Forgetting or Memory Lapses
• Serial Position Effect– First and last items on a list block retrieval of
information in the middle
• Context – dependent learning– Memory fails when context at retrieval differs from
context at encoding
• Reconstructive nature of memory– Take in information, discard details, organize rest in
meaningful patterns– At retrieval, reconstruct details based on fragments
that are stored