Chapter 6 & 7 - Long-term memory Flashcards
Three ways to distinguish between different types of memory
We will do this by considering the results of
(1)behavioral experiments,
(2)neuropsychological studies of the effects of brain damage on memory, and
(3)brain imaging experiments.
serial position curve - whose experiment does this stem from? What is the experiment? What two things do the results indicate?
Murdock
a memory experiment in which participants are asked to recall a list of words, a plot of the percentage of participants remembering each word against the position of that word in the list
indicates primacy effect and recency effect
primacy effect - what is it and what does it indicate?
memory is better for words at the beginning of the list
rehearsal - encoding into LTM
recency effect - what is it and what does it indicate?
most recent info is likely to be the first remembered -
STM encoding
what would happen if you had to count backwards during the serial position curve experiment?
you would erase the recency effect because those last few words wouldn’t stay in STM but the primacy effect would still occur because the rehearsal encodes them into LTM
what do the primacy and recency effects provide evidence for?
separation between STM and LTM
Coding
the form in which stimuli are represented in the mind. For example, information can be represented in visual, semantic, and phonological forms.
Examples of visual coding in STM and in LTM
visual coding in STM if you remembered the pattern by representing it visually in your mind
visual coding in LTM when you visualize a person or place from the past
Examples of auditory coding in STM and in LTM
Auditory coding in STM is illustrated by Conrad’s demonstration of the phonological similarity effect
Auditory coding occurs in LTM when you “play” a song in your head.
Examples of semantic coding in STM and in LTM
semantic coding in STM - Wickens experiment (fruits, professions, etc., word lists):
proactive interference
release from proactive interference - that occurs in the Wickens experiment depends on the words’ categories (fruits and professions)
Semantic coding in LTM - Sachs experiment:
had participants listen to a tape recording of a passage and then measured their recognition memory to determine whether they remembered the exact wording of sentences in the passage or just the general meaning of the passage
The finding that specific wording is forgotten but the general meaning can be remembered for a long time has been confirmed in many experiments
Recognition memory
Identifying a stimulus that was encountered earlier. Stimuli are presented during a study period; later, the same stimuli plus other, new stimuli are presented. The participants’ task is to pick the stimuli that were originally presented.
what is the predominant type of coding in STM?
auditory coding (rehearsal)
what is the most common form of coding in LTM tasks?
semantic coding
the strongest evidence for separation of STM and LTM in the brain is provided by what?
neuropsychological studies
Case of HM - what brain area affected? what was result of brain change? what did this change indicate about memory?
removal of hippocampus due to seizures
eliminated ability to form new LTM
STM remained intact
suggested that short-term and long-term memories are served by separate brain regions
hippocampus - where is it and what relation does it have to memory?
subcortical structure in the temporal lobe - important for forming LTM and also plays a role in remote episodic memories and in short-term storage of novel information
Case of KF -what brain area affected? what was result of brain change? what did this change indicate about memory?
damage to parietal lobe in motorbike accident
poor STM indicated by reduced digit span (2 digits)
recency effect was reduced
had functioning LTM indicated by abiity to form and hold new memories of events in life
together with HM, he establishes a double dissociation - supports that STM and LTM are caused by different mechanisms which can act independently
Can the hippocampus hold info for short periods of time? How do we know about this?
Ranganath and D’Esposito - brain scan while viewing familiar and novel faces experiment
concluded that the hippocampus is involved in maintaining novel information in memory during short delays
show that the hippocampus and other medial temporal lobe structures once thought to be involved only in LTM also play some role in STM
Tulving suggested that episodic and semantic memory can be distinguished based on the type of _______________ associated with each
experience
mental time travel
the defining property of the experience of episodic memory, in which a person travels back in time in his or her mind to reexperience events that happened in the past
experience of self-knowing or remembering
How does Tulving describe the experience of semantic memory?
knowing - does not involve mental time travel
neuropsychological evidence of episodic/semantic memory separation
case of KC - motorcycle accident - damage to hippocampus and surrounding structures
- lost episodic memory but semantic memory largely intact
case of LP - Italian woman - encephalitis
- severe impairment of semantic memory but maintained episodic memory
(double dissociation)
two ways that episodic and semantic memories interact in everyday life
how knowledge (semantic) affects experience (episodic) - knowledge (semantic memory) guides experience and influences episodic memories that follow
the makeup of autobiographical memory - can include both episodic and semantic components
personal semantic memories
semantic memory that is associated with personal experiences
(e.g., the table near the window is our favourite one, that table is difficult to get in the morning)
experiences related to _________________ memories can aid in accessing _______________ memories
example?
episodic
semantic
you would be more likely to recall the name of a popular singer (semantic information) if you had attended one of his or her concerts (episodic experience) than if you just knew about the singer because he or she was a famous
is forgetting an all-or-nothing process? what are examples?
no - there are different degrees of forgetting and remembering
familiarity - someone seems familiar but you can’t remember their name or where you met them - associated with semantic memory
recollection - remembering specific experiences related to that person - associated with episodic memory
how can you measure familiarity and recollection?
the remember/know procedure
remember = remembering the circumstances under which you initially encountered the stimulus
know = stimulus seems familiar but you don’t remember experiencing it earlier
don’t know = don’t remember the stimulus (isn’t familiar) at all
What did the Petrican experiment show in relation to the remember/know procedure? what phenomenon does this illustrate?
remember responses decreased much more than know responses, meaning that memories for 40- to 50-year-old events had lost much of their episodic character
semanticization of remote memories - loss of episodic detail for memories of long-ago events
does the semanticization of remote memories only apply to long-ago memories?
no, also for periods as short as 1 week
what is some evidence for the connection between the ability to remember the past and the ability to imagine the future?
case of KC - lost episodic memory - also unable to describe personal events that might happen in the future
brain regions active while thinking about the past are also active when imagining the future
constructive episodic simulation hypothesis
The hypothesis proposed by Schacter and Addis that episodic memories are extracted and recombined to construct simulations of future events.
McDermott study
first-person perspective vs. third-person perspective
both remembered and imagined events were more likely to be “seen” from a third-person perspective, although there were slightly fewer third-person perceptions for the remembered past (71 percent) than for the imagined future (78 percent)
when mind wandering occurs, people are more likely to think about the ____________ than about the ____________ or ____________.
why is this?
future
past or present
to help people plan for the future by helping create simulations of the future from our episodic memories
damage to the DMN can cause problems in retrieving…
autobiographical memories
Explicit memories
Memory that involves conscious recollections of events or facts that we have learned in the past.
implicit memories
Memory that occurs when an experience affects a person’s behavior, even though the person is not aware that he or she has had the experience.
three parts of implicit memories
procedural memory, priming and conditioning
Procedural memory
Memory for how to carry out highly practiced skills. Procedural memory is a type of implicit memory because although people can carry out a skilled behavior, they often cannot explain exactly how they are able to do so.
what example demonstrates a link between semantic memory and memory involving motor skills?
Case of LSJ
skilled violinist who suffered a loss of episodic memory due to damage to her hippocampus caused by encephalitis, but who could still play the violin
Also lost much of her semantic world knowledge - further testing of LSJ revealed an interesting result: Although she had lost most of her knowledge of the world, she was able to answer questions related to things that involved procedural memory - about music (“Which instruments usually make up a string orchestra?”), driving (“How many sides does a stop sign have?”)
can amnesiac patients master new skills? what does this illustrate?
yes, amnesiac patients can master new skills even though they don’t remember any of the practice that led to this mastery
illustrates the implicit nature of procedural memory
expert-induced amnesia
Amnesia that occurs because well-learned procedural memories do not require attention.
The result of this automatic action is that when asked about what they did in carrying out a skilled action, the expert often has no idea.
Priming
A change in response to a stimulus caused by the previous presentation of the same or a similar stimulus.
repetition priming
When an initial presentation of a stimulus affects the person’s response to the same stimulus when it is presented later.
why is priming part of implicit memory?
is called implicit memory because the priming effect can occur even though participants may not remember the original presentation of the priming stimuli
how can you test implicit priming and ensure that the participant doesn’t remember the presentation of the priming stimulus? what’s an example of this?
test patients with amnesia - Graf experiment:
results of the word completion test, showing the percentage of primed words that were created, indicate that the patients with amnesia performed just as well as the controls
propaganda effect
People are more likely to rate statements they have read or heard before as being true, just because of prior exposure to the statements.
can occur even when the person is told that the statements are false when they first read or hear them
how is repetition priming different from subliminal priming?
because we are aware of the stimulus in repetition priming but may affect us without realizing
why is classical conditioning considered implicit memory?
This is implicit memory because it can occur even if the person has forgotten about the original pairing
Conditioning in real life is often linked to what? what is an example?
emotional reactions
you meet someone who seems familiar but you can’t remember how you know him or her - however, you feel either positively or negatively about the person
the character of Jason Bourne is related to what rare condition?
psychogenic fugue - Symptoms of this condition include traveling away from where the person lives and a lack of memory for the past, especially personal information such as name, relationships, place of residence, and occupation
the most common example of errors in memory terminology in movies is what?
loss of LTM is identified as a loss of short-term memory:
reflects a common belief that forgetting things that have happened within the last few minutes or hours is a breakdown in short-term memory
Encoding
The process of acquiring information and transferring it into LTM.
maintenance rehearsal
Rehearsal that involves repetition without any consideration of meaning or making connections to other information.
elaborative rehearsal
Rehearsal that involves thinking about the meaning of an item to be remembered or making connections between that item and prior knowledge