memory, different abilities, three systems
MEMORY: retention of information over time
memory reflects different abilities (its not just one thing)
** memory is RECONSTRUCTED not REPRODUCED **
- you dont reproduce memories exactly how they happen, you rebuild them
- memory is very fluid
- Memories change everytime you remember them and you rebuild them
- Photographic memory doesn’t exist?
3 general systems:
- 1) Sensory memory
- 2) Short-term memory
- 3) Long-term memory
memory system overview
Each system differs in SPAN/capacity and DURATION
sensory memory (span, duration)
SENSORY MEMORY: holds sensory information (very briefly) so it can be transferred to short-term memory
- Short duration, but large capacity
- Each sense has its own system
- Iconic (vision, ½ a second long)
- Echoic (hearing, 2-4 seconds)
- Allows more elaborate perceptual processing
short-term memory (span, duration, decay, interference)
SHORT-TERM MEMORY: holds information temporarily in your mind
- Aka working memory
- Duration of information lasts about 20-30 seconds (without rehearsing) (because you’re constantly refreshing what you’re thinking about from moment to moment)
- Capacity is limited to 5-9 items
- DECAY: short term memories fade away after a while when untouched
INTERFERENCE: short term memories disappear because our memories get in the way of each other.
long-term memory (explicit + implicit)
LONG-TERM MEMORY: information acquired across lifespan
- Perhaps unlimited (?) duration and capacity
- Different types
1) EXPLICIT/DECLARATIVE LONG-TERM MEMORY: memory that is consciously recalled
- EPISODIC: events in our lives we’ve consciously experienced (events you’ve consciously lived through first-hand) (e.g. remembering what you wore yesterday)
- SEMANTIC: facts of the world (knowledge and concepts) (e.g. 9/11)
- These two divisions exist in different parts of the brain because you can have one and not the other
- Episodic memories can turn into semantic memories
2) IMPLICIT/NON-DECLARATIVE LONG-TERM MEMORY: memory that does not require conscious thought
- PROCEDURAL: habits and how to do things (skills and actions) (e.g. playing piano without thinking about it) (e.g. tying your shoes)
- PRIMING: exposure to a stimulus influences future response to a different stimulus (information you’re exposed to earlier influences what information you recall later on) (e.g. imagining the colour yellow so you think of banana)
primacy and recency
Tendency to remember different words based on where they are on the list (beginning or end) because of short and long term memory
PRIMACY: remembering things at the start of a list well (long-term affects?)
RECENCY: remembering things at the end of a list well (short-term effects?)
3 memory processes
memory process 1: encoding (attention + mnemonics)
ATTENTION
- Unless you pay attention, it won’t be encoded (it won’t encode to long-term memory) (e.g. what direction does the sail face on a dime?)
MNEMONICS
- Learning aids/strategies that enhance later recall (e.g. BEDMAS)
memory process 2: storage (engrams + consolidation + schemas purpose in future situations)
ENGRAMS
- Physical trace of memory in the brain (the memory itself)
- Physical changes in our brain as a result of experience (memory traces)
- Structural + functional changes in our CNS as a result of experience
CONSOLIDATION
- Stabilizes memory traces in CNS
SCHEMAS: Mental models or knowledge structures (e.g. what a sofia is, how to order at a restaurant)
- Gained through experience (the general idea of an object is encoded in your CNS) (e.g. you know what a car deos even though you dont remember every single car you’ve ever seen)
- Frames of reference for interpreting new situations (knowledge you have for the new observation of an object)
memory process 3: retrieval ( recall + recognition + retrieval cue)
2 types:
- RECALL: generating remembered information on your own (e.g. generating the correct response on short answer)
- RECOGNITION: selecting previously remembered information from several options (e.g. recognizing the correct multiple choice option)
encoding and retrieval (context-dependeant, state-dependent, and mood-dependenet memory)
CONTEXT DEPENDENT MEMORY: match in physical/external context between encoding and retrieval
- e.g. where you learn information is where you’ll retrieve it best
- e.g. divers encode on load, recall best on land, encode underwater, recall best underwater
STATE-DEPENDENT MEMORY: match in internal/mental context between encoding and retrieval
- e.g. learning sober/drunk vs recalling sober/drunk
MOOD-DEPENDENT MEMORY: match in mood between encoding and retrieval
- e.g. if you learn it happy then your best recall is when youre happy
Karl Lashley
ENGRAM: physical changes in our brain as a result of experience (memory traces)
LEARNED ABOUT MEMORY THAT:
- Engrams are not stored in a single place, but they’re distributed in the brain
Donald Hebb (LTP + LTD + affect on synapse)
LONG-TERM POTENTATION (LTP): strengthening of connections between two neurons after they are repeatedly activated
- increases the efficacy of synaptic transmission
- “Neurons that fire together wire together”
- The more a pair of neurons is stimulated the more action potentials that pair fires together, increasing the amount of neurotransmitters released into the synaptic cleft which results in enhanced learning
LONG-TERM DEPRESSION (LTD): weakening of connections between two neurons after they are both activated
- reduces the efficacy of synaptic transmission
hippocampus (where and what it is + its role in memory)
synaptic theory of memory
SYNAPTIC THEORY OF MEMORY: memories as relative weights (connection strength) between neurons
- the storage of information in the brain is based on changes to the connections between neurons
brain regions and types of memories (hippocampus + cerebellum + prefrontal cortex)
Hippocampus:
- codes EXPLICIT memories
- Forming new memories
- In charge of explicit memory
Cerebellum:
- related to IMPLICIT memories
Prefrontal cortex:
- semantic memory
- working/short-term memory
Entire cortex:
- Forms of EXPLICIT memory
H.M. and Amnesia (anterograde amnesia + retrograde amnesia)
H.M. was a patient diagnosed with anterograde amnesia
- Had his bilateral temporal lobe (two hypocampi) removed due to seizures
- Brenda Milner discovered H.M. and treated him with anterograde amnesia
AMNESIA: loss or disorder of memory
ANTEROGRADE AMNESIA amnesia: inability to form new long-term memories
RETROGRADE AMNESIA: can’t access old memories
H.M. performed the drawing star from mirror task three days in a row and with each day he showed less mistakes
Elizabeth Loftus + Misinformation effect
MISINFORMATION EFFECT: creating fictitious memories by providing misleading information after the event takes place
Stop sign vs yield sign experiment
- Influence of verbs: The severity of the verb made people misrememebr the speeds they saw the car moving
- Changed the verb to describe what happened: contacted smashed or hit (agressive words + fast speed) vs bumped or collide (gentle words + slow speed)
Lost in the mall example
- Its possible to remember information that didn’t happen
factors that affect eyewitness testimony (confidence, race, fixation on weapons)
flashbulb memories
FLASHBULB MEMORIES: vivid and detailed emotional memories
- E.g. remembering where you were when you learned about 9/11
Believed to be stable, but how accurate are they?
- There’s a chance for that memory to be corrupted before you recall it again, so not that accurate
language (arbitrariness , purpose)
LANGUAGE: communication system that relies on patterns and rules of symbols (i.e. words or gestural signals)
- Patterns and rules help us organize communication symbols (e.g. pattern of subject + verb + adjective + direct object to describe what people are doing)
- Combines patterns and rules to provide meaning
Language is arbitrary
- the sounds, words, and sentences of language bear no clear relation to their meaning
- symbols dont match objects
- The symbols we use in language don’t always reflect the properties of the concepts we are trying to represent
- e.g. the word dog doesnt describe what a dog looks like or does
Purpose of language is to convey information, socialize, express emotions, create art
language levels (phonemes, morphemes, syntax, extralinguistic information)
morphemes vs phonemes
phoneme = smallest unit of sound in a language
morpheme = smallest unit of meaning in a language
phoneme = related to the sound and pronounciation of a language
morpheme = related to the meaning and structure of a language
dialect
DILAECT: language variations specific to geographical/ethnic groups
- Dialects aren’t distinct languages, but about variation in pronounciation and word choices
- E.g. people in Boston might have distinct accent compared to other places in North America
- E.g. people might refer to the description of a summer house/hoodie as differen words