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Transcript of CHS AP Psychology Unit 7 Part I : Memory (Cognition) Essential Task 7.2: Outline principles that...
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CHS AP Psychology
Unit 7 Part I : Memory (Cognition)
Essential Task 7.2:Outline principles that help improve memory functioning at each stage: encoding - attention, chunking, serial positioning effect, deep versus shallow processing, and rote rehearsal storage - decay theory, elaborative rehearsal, spacing effect, method of loci, and link method retrieval - retroactive interference, proactive interference
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Storage: Retaining Information
Storage is at the heart of memory. Three stores of memory are shown
below:
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Sensory MemoriesThe shortest retention of all memory stores IF
not rehearsed. The duration of sensory memory varies for the
different senses.
Iconic0.5 sec. long
Echoic3-4 sec. long
Hepatic< 1 sec. long
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Decay Theory
• The decay theory argues that the passage of time causes forgetting.
• The longer information is not accessed, increases the chances of forgetting it.
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Working Memory
Working memory is the new name for short-term memory •has a limited capacity (7±2) •short duration (20 seconds)
When working on its own without help from the Long Term Memory (LTM)
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Capacity
The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing
Information (1956).
George Miller
You should be able torecall 7±2 letters.
M U T G I K T L R S Y P
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Duration
Peterson and Peterson (1959) measured the duration of working memory by
manipulating rehearsal.
CHJMKTHIJ547
547544541…
CH??
The duration of the working memory is about 20 sec.
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Working Memory Duration
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Long-Term Memory
Essentially unlimited capacity store.
The Clark’s nutcracker can locate 6,000 caches ofburied pine seeds during winter and spring.
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Synaptic Changes
Long-Term Potentiation (LTP) refers to synaptic
enhancement after learning (Lynch,
2002). An increase in neurotransmitter
release or receptors on the receiving neuron indicates strengthening of
synapses.
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Long-Term Potentiation (LTP)
• LTP is the physical basis for learning:– Drugs that block LTP interfere with
learning– Mice engineered to lack an enzyme
needed for LTP can’t learn their way out of a maze
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Stress Hormones & Memory
Heightened emotions (stress-related or otherwise) make for stronger memories. Flashbulb memories are clear memories
of emotionally significant moments or events
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Types of Long Term Memory
• Explicit memory– Memory for information we can readily express
and are aware of having– This information can be intentionally recalled
– Episodic Memories - Memories for personal events in a specific time and place
– Semantic Memories - Memory for general facts and concepts not linked to a specific time
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Types of Long Term Memory
• Implicit memory – Memory for information that we cannot readily
express and may not be aware of having– Cannot be intentionally retrieved
– Procedural memories: Motor skills and habits
– Emotional memories: Learned emotional responses to various stimuli
@#$!&@#$!&
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HippocampusHippocampus – a neural center in the limbicsystem that processes explicit memories.
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Anterograde Amnesia
After losing his hippocampus in surgery, patient Henry M. (HM) remembered everything before the operation but cannot make new memories. We call
this anterograde amnesia.
AnterogradeAmnesia
(HM)No New Memories
Surgery
Memory Intact
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CerebellumCerebellum – a neural center in the hindbrain
that processes implicit memories.
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Maintaining Long-Term Memory
• Rote rehearsal– Repetition can result in long-term
memory– Only effective if there is intent to learn
material– Example: What does a penny look like?
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Maintaining Long-Term Memory
• Elaborative rehearsal– Process of relating new information to
information already stored in memory– Meaning is assigned to new information
and then linked to as much existing knowledge as possible
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Link Method
• First imagine a silly, memorable image that represents the type of list you want to remember. Also include in this image the first item on the list (see below for example). This image is your header for the list.
• Think of another silly, memorable image that links the first item on the list to the second item and so on.
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Activity
• Close your eyes• Count the number of windows you
have in your house
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Method of Loci (Places)
• Most of you used the method of Loci to “walk through” your house in your mind and count the windows
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Retrieval
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Retrieval: Getting Information Out
• Retrieval refers to getting information out of the memory store.
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Measures of Memory
• Recognition: Identifying the item among other choices
• Recall: retrieve information with effort
• Relearning: the individual shows how much time (or effort) is saved when learning material for the second time
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Retrieval Cues
Memories are held in storage by a web of associations. These associations are like
anchors that help retrieve memory.
Fire Truck
truck
red
fire
heatsmoke
smellwater
hose
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Priming
To retrieve a specific memory from the web of associations, you must first
activate one of the strands that leads to it. This process is called priming.
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Where and when matters:Context Effects• Situational factors
– Recall of information is better if environment is the same as when information was learned
• State-dependent memory– Recall of information is better if person is in the
same physiological state as when information was learned
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Déjà Vu
• Déjà Vu means “I've experienced this before.” Cues from the current situation may unconsciously trigger retrieval of an earlier similar experience.
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Parallel Processing
• Tip of the Tongue Phenomenon is when you can almost recall something, but can’t quite get it.
• If you leave it your brain will continue to work on this problem eventually surfacing with the answer.
• Thus you later yell out the name of the actor and everyone looks at you like you are odd.
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Interference
• Retroactive interference– Occurs when new information interferes
with information already in memory– Retro means old– In this term the old information is being
tested– Thus the new information is doing the
interference.
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Try remembering the following number
• 8132163• Ok that was easy because nothing
interfered with you.
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Now let’s try some interference• 4982631• First, consistent with cognitive dissonance theories,
we are able to induce optimism or pessimism with the initial (random) wage assignment. With respect to the first-stage task, this implies that we can successfully manipulate one’s ability-beliefs in the lab. Secondly, subjects who received this low piece-rate in stage one were willing to accept significantly lower offers in a second-stage ultimatum game. This finding is striking, demonstrating the presence of both belief manipulation and spillovers of those beliefs into behavioral outcomes in an unrelated and distinct experimental environment.
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Try remembering the following number
• 5614982• 92589386
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Retroactive Interference
• The last two were examples of retro-active interference
• In each one, it was the OLD (retro) information that was being tested.
• The last trial was the hardest because it overloaded your modality.
• So, what type of music should you listen to when you write an essay?– Yep, music with NO LYRICS!
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Retroactive Interference
Sleep helps prevent retroactive interference. Therefore, it leads to
better recall.
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Interference
• Proactive interference– This is when new information is being tested.– The old information already in your LTM interferes. – It is tough to teach an experienced show dog new
tricks.– Psychologists have found that recall of later items can
be improved by making them distinctive from early items.
• For example, people being fed groups of numbers to remember did much better when they were suddenly fed a group of words instead. This is called release from proactive interference
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I need a volunteer that knows their colors.
• Don’t read the words, just say the colors they’re printed in and as fast as you can
• This is called the stroop effect
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RedYellowGreen
BlueRedBlue
YellowGreenBlueRed
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Interference• When you look at the words you see
both its color and meaning.• When they are in conflict you must
make a choice• Experience has taught you that word
meaning is more important than color so you retrieve that information.
• You are not always in complete control of what you pay attention to.
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Schemata
• A schema is a set of beliefs or expectations about something based on past experience
• Incoming information is fit with existing schemata • Schemata can also influence the amount of
attention paid to a given event• Reconstruction
– Memories can be altered with each retrieval– We do this to keep the schemata of our self and our
environment