cognition: memory and its parts ap psychology gloucester high school mr. perreault

Cognition:Memory and its Parts

AP PsychologyGloucester High School

Mr. Perreault

Memory

A system that encodes, stores and retrieves information

Three Basic Tasks

• According to the information-processing model, the human brain takes essentially meaningless information and turns it into meaningful patterns.

• It does this through three steps:

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3 Basic Parts of Encoding

• Encoding: the modification of information to fit the preferred format for the memory system.

• in most cases, encoding is automatic and happens without our awareness. Other encoding, however, like these notes, require extra encoding effort called elaboration to the memory more useful

Encoding The more time we spend learning novel information, the more we remember

Time in minutes taken to relearn lists on day 2

Number of repetitions of lists on day 1

Using 16 unrelated 3 letter sequences

Encoding-3 Types

• When we are exposed to stimuli and encode information, we do it in three ways:

• Semantic Encoding: encoding of meaning including meaning of words

• Acoustic Encoding: encoding of sound especially sound of words

• Visual Encoding: encoding of pictures images

3 Basic Parts: Storage• Storage: the retention of encoding material over

time• In terms of storing material, we have three stages

of memory (duration)• Sensory Storage: length of time we “hold onto” a

stimuli• Working Memory: (Short-term) Average person

can hold 7 items here• Long-term Memory: Items held onto for your

healthy life

Synaptic Changes and Storage• One physical change in the brain during

memory storage in the synapses.• Memories begins as impulses, coursing through

the brain circuits, leaving a semi-permanent trace.

• The more a memory is utilized, the more potential strength that neuron has, called long-term potentiation

• Neural basis for learning and remembering associations

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Strengthening LTP

• Research suggests the best way to remember things is to study them then sleep.

• One LTP has occurred, even passing an electrical current through the brain will not erase well stored memories

• More recent memories will be deleted• People who have a concussion and cannot

remember before or after the event did not have a chance to “consolidate” memories to long-term

3 Basic Parts: Retrieval

• Retrieval: the locating and recovering of information from memory

• While some memories return to us in a split second, others seemed to be hidden deeper and others are never “recovered” correctly

Eidetic Imagery

• Technical term for photographic memory• Can recall a memory in minute detail and

portray the most interesting and meaningful parts most accurately.

• The images can be brief or last for days• Tends to be more common in children and

seem to decline as a person’s language abilities increase

3 Stages of Memory• We encode information and store it in one of

three types of memory, depending on what we need the information for.

• Our memory works like an assembly line• Before entering LTM it must pass through

sensory storage and working memory


Sensory Memory

• Shortest memory type-fraction of a second• Holds a large amount of information, far more

than ever reaches consciousness• Memory lasts long enough to dissolve into the

next one, gives the impression of a constant flow

Sperling’s Test

• George Sperling flashed a group of letters for 1/20 of a second. People could only recall about half of the letters

• When he signaled to recall a particular row immediately after the letters disappeared with a specific tone they could do so with near perfect accuracy

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Working Memory

• AKA Short-term memory, the place where we sort and encode information before transferring it to LTM or forgetting it.

• Held for on average 20 seconds, though can last a few minutes

• Average person can hold 7 items here

Bradley’s Three Systems ofWorking Memory

• Central Executive: controls our attention and coordinates working memory for a specific task

• Phonological Loop: Stores and utilizes semantic (word) information

• Visual-Spatial Sketchpad: stores and utilizes soeech based information

Working Memory

• Subject to two limitations: Capacity and duration

• Coping mechanisms:• Chunking (phone number): 10 individual items

chunked into three groups more efficient• Rehearsal: Practice does not make perfect: • Perfect practice makes perfect

Maintenance Rehearsal

• Information is repeated to keep it from fading while in working memory

• Does not involve active elaboration-assigning meaning to the information

Maintenance Rehearsal

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Levels of Processing

• In working memory, information can be elaborated in or connected with long term memories.

• The Levels of Processing Theory says that information is more thoroughly connected to meaningful items in LTM will be remembered better

Levels of Processing Theory

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Long-term Memory• As far as anyone knows, there is no limit

duration or capacity of the LTM• LTM is all of the knowledge of yourself and the

world around you.


Procedural Memory (Implicit)

• Memory of how things are done


Declarative Memory (Explicit)

• Memory of specific information such as facts and events

• Requires conscious mental effort


Divisions of Declarative Memory

• Episodic Memory: stores personal events or “episodes”, things like time and place

• Semantic Memory: stores general knowledge, facts and language meaning. All the information you “know” is stored.

Studies: Implicit vs. Explicit• People with amnesia who read a story once will

read it faster a second time, showing implicit memory.

• There is no explicit memory though as they cannot recall having seen the text before.

• People with Alzheimer’s who are repeatedly shown the word perfume will not recall having seen it.

• If asked the first word that comes to mind in response to the letters per they say perfume which displays learning.

Flashbulb Memory

• Of all our forms of memory, a few are exceptionally clear and vivid.

• Memories tend to be of highly emotional events.

• Where were you when: • JFK’s assassination or 9/11

Engram

• The biological basis for LTM , AKA memory trace

• Two theories of where memory is stored:• Neural circuitry• Biological changes in the synapse

Parts of the Brain Used in Memory

• Psychologists know that the hippocampus and the amygdala are involved in memory

• In a process called consolidation, information in the working memory is gradually changed over to LTM

• The amygdala seems to play a role in strengthening memories that have strong emotional connections

Types of Amnesia

• Retrograde: inability to remember information previously stored in memory (before amnesia)

• Anterograde: inability to form new memories from new material (remember old stuff)

• As memories form, neurotransmitters collect the synapses (before absolute threshold is crossed). These are called memory traces. A sharp blow to the head or electric shock can prevent these traces from consolidating, making it hard to recall the information

Types of Memory• When dealing with LTM, 2 types• Implicit: memory that is not deliberately

learned-no conscious awareness (muscle memory)

• Explicit: memory that has been processed with attention and can be consciously recalled.

• General Rule: implicit memory affects behavior or mental processes without becoming conscious. Explicit memories always involve consciousness

Retrieval Clues

• The search terms we use to activate memory, like a Google search, the more specific you are the better the results will be.

• Some memories are easily remembered, while others are much harder to bring up.

• Drawing a blank on a test may be a result of wording being different from what you studied.

Recall and Recognition

• Memories can be used in two ways• Recall: retrieval method in which one must

reproduce previously presented material• Essay test or police sketch of a suspect• Recognition: retrieval method in which one

must identify information that is provided, which has been previously been presented

• Multiple choice tests or police line-up

Other Factors Affecting Retrieval

• Encoding specificity principal: the more closely the retrieval clues match the way the information was encoded, the better the information will be remembered

• Mood-congruent memory: theory which says we tend to selectively remember memories that match (are congruent with) our current mood.

Memory Construction

• We often construct our memories as we encode them, and we may also alter our memories as we withdraw them

• We infer our past from stored information and what we assume

• By filtering information and filling in missing pieces our schemas (understanding of specific settings) direct our memory construction

Misinformation

• As memory fades with time following an event, the injection of misinformation becomes easier.

• Imagination inflation occurs because visualizing something and actually perceiving it activate similar brain areas

Misinformation Effects


Repressed Memories

• During the 1990s, the idea of repressing painful memories became a big topic

• While some psychoanalysts still support the idea, most psychologists agree that events that are traumatic are typically etched on the mind as vivid, persistent, haunting memories

Forgetting

• Not all information learned is retained

• According to Daniel Schacter this is a result of one of the “Seven Sins of Memory”

1. Transience2. Absent-mindedness3. Blocking4. Misattribution5. Suggestibility6. Bias7. Persistence

1 Transience• The impermanence of LTM-based on the idea

that memories gradually fade in strength over time-also known as “decay theory”

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2 Absent Mindedness

• Forgetting caused by lapses in attention• Where did you park the car?• Where are my keys• Am I wearing pants?

3 Blocking

• Forgetting when a memory cannot be retrieved because of interference

• Proactive Interference: Old memory blocks storage of new memory (Cannot remember new phone number)

• Retroactive Interference: New memory blocks retrieval of old memories (Applications not remembering previous jobs)

Serial Position Effect• Form of interference related to the sequence in

which material is presented• Generally items in the middle are remembered

less• Primacy: relative ease of remembering the first

information in a scene• Recency: storing memories of the most recent

information in a series• Info in the middle is exposed to both types of

interference

Encoding: Serial Position Effect


4 Misattribution

• Memory faults that occur when memories are retrieved, bit are associated with the wrong time, place or person.

• Ex. Psychologist Donald Thompson accused of rape. His alibi was airtight as he was giving a TV interview the victim had been watching just prior to the assault

5 Suggestibility

• The process of memory distortion as the result of deliberate or inadvertent suggestion

• Eyewitness accounts are a large part of the legal system, unfortunately they can be highly unreliable

• With the Misinformation Effect memories can be embellished or even created by cues and suggestions

6 Bias

• The influence of personal beliefs, attitudes and experiences on memory

• Expectancy Bias: a memory tendency to distort recalled events to fit one’s expectation

• Self-consistency Bias: A commonly held idea that we are more consistent in our attitudes and beliefs, over time, than we actually are.

7 Persistence• Memory problem where memories cannot be

put out of mind• Depressed people cannot stop thinking about

how bad their life is and how unhappy they are; creating a self fulfilling problem

• Psychologists think that emotions strengthen the physical changes in the synapses that hold our memories, thus, highly emotional memories can be harder to out from one’s mind

Forgetting Isn’t All Bad• According to Schacter, the “seven sins” are

normal parts of human memory and the result of adaptive features in our memories

• Transience: to avoid memory overload• Blocking: to focus on the task at hand• Absent-mindedness: ability to shift attention• Misattribution/Bias/Suggestibility: focus on

meaning not detail• Persistence: to remember especially emotional

memories

cognition: memory and its parts ap psychology gloucester high school mr. perreault

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