7-WorkingMemory Flashcards

1
Q

What is a task set?;

A

Preparation to perform one task rather than another; involves selecting, linking, enabling “modules” for task components (e.g., perception, response selection)

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2
Q

When do switch costs arise?

A

In establishing the appropriate task set & disengaging an inappropriate set

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3
Q

What does a typical switching task procedure involve?;

How do you avoid confounding practice & fatigue?

A

Usually simple responses to digits & letters (e.g. AABB, etc, where A is one task & B is another);
These are matched over switch trials and same-task trials

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4
Q

When the task changes, even though the task changes are regular and thus predictable, what is usually observed?

A

A severe switch cost of up to several hundred ms

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5
Q

Jersild (1927) found there were small switch costs if both stimuli and responses were different (e.g., number task alternating with word task). When were major costs incurred?;
Do participants occasionally forget what task is next?

A

When participants change the task and thus the response selection rule for a common stimulus configuration (attaching 2 response demands to the same set of stimuli becomes tricky);
No. No evidence of occasional slow trials; instead a general slowing over the RT distribution

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6
Q

There is a large literature showing that repeated stimuli are processed more easily (through pre-activation of their memory representations). When is this not the case?

A

When these repetition effects are controlled (e.g. same stimulus on every trial but cued to do different things with them), resulting in switch costs

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7
Q

In Rogers & Monsell’s (1995) AABB paradigm, digit-letter pairs appeared in one of 4 boxes & participants pressed right or left buttons for odd or even digits; & right or left for consonants or vowels in the letter task. How did they perform in switch tasks compared to non-switch tasks?

A

There was a large switch cost (even though task switches were predictable); a large improvement on day 2, especially for switch trials; similar performance for letter and digit tasks (similar difficulty)

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8
Q

What occurs with practice of separate tasks & switching tasks?

A

Costs are reduced but not eliminated

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9
Q

In relation to task difficulty, what incurs the greater cost?;
What does this result suggest about the roles of relevant task engagement vs. irrelevant task disengagement in switch costs?

A

Switching TO the easier / dominant task (e.g., from colour naming to word naming in Stroop task);
The prior difficult task requires effort & concentration so it’s hard to disengage (counter-intuitive)

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10
Q

Rogers & Monsell (1995) conducted a study with an emphasis on Task Set Re-configuration (TSR) prior to the switched task (had to change task set to meet demands of the next task). What was found?

A

Can maintain 2 task sets for different tasks & stimuli. But with different responses for the same stimuli, need to change task set when task changes (applying to a common set is harder to maintain)

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11
Q

In a task-cuing paradigm by Sudevan & Taylor (1987), participants made different judgements about digits. They were cued before the trial as to which task to perform & the cue to digit interval was manipulated (400 to 4000 ms). What was found?;
What factors confounded with these results?

A

Switch cost decreased as the interval increased to 2-3 sec (more time given, the lower the switch cost);
Preparation time with delay from the previous trial

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12
Q

Meiran (1996) had participants give the position of a disk (up, down vs. left, right); they were given a pre-trial cue. They maniplated cue-to-next-stimulus interval and last-response-to-cue interval. What was found?;
What does this suggest?

A

A short cue-to-stimulus interval led to a large switch cost even if there was a long delay from the last trial;
That it’s an active preparation effect, not just decay of effects of prior trial (involves both disengaging the past task and engaging the coming task)

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13
Q

Can adequate preparation remove the switch cost?

A

No, there is always a residual cost (so task preparation is not the whole story)

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14
Q

What kind of effects are residual costs?

A

Exogenous effects - “stimulus driven” (no matter how prepared you are you can’t do any decision-making for the next trial until the stimulus has been presented and identified)

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15
Q

Meiran found that response selection on switch trials is subject to interference from the prior trial, & that deciding on the response for the current stimulus may be affected by what?

A

The response associated with the stimulus for the alternative task (e.g. pressing L in one trial then R in the next)

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16
Q

In Roger & Monsell’s Task congruity trial with letter-digit stimuli, what was the effect between congruent & incongruent trials?;
What does this reflect?

A

Incongruent (R for letter, L for vowel) produced a slower reaction time than congruent (R for both);
Participants’ learning of responses for certain stimuli

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17
Q

In what ways do theories of the switch cost differ?

A

The role of active preparation (endogenous factor); the role of interference effect from prior task & task set that dissipate passively (with the passage of time); whether exogenous factors play a role

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18
Q

Describe the Disengagement theory by Alport et al.

A

Proactive interference occurs from “task set inertia” (TSI) – we hang on to the prior task; this decays after several minutes; but impairs adoption of the alternative task set

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19
Q

Explain the Endogenous component described by Rogers & Monsell;
The residual cost that cannot be removed by adequate preparation is due to what?

A

Preparation by participant requires time; switch cost is reduced as preparation time increases.
An exogenous component of the task set that must be triggered by the arrival of a suitable stimulus

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20
Q

Describe the Endogenous Only theory by de Jong

A

The residual cost arises because participants do not prepare adequately on every trial

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21
Q

As proposed by Nieuwenhuis & Monsell, 2002, what can we conclude about switch costs?

A

That even when motivation, fatigue & practice addressed, and RTs decrease, a residual switch cost remains, so it’s necessary to consider both endogenous & exogenous control

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22
Q

What is Kahneman’s capacity theory in regards to automaticity?;
According to this theory, what does substantial practice lead to?

A

Over-learned tasks become automatic & consume few resources;
Improves performance, reduces task effort; facilitates re-structuring and co-ordination of concurrent tasks

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23
Q

Shiffrin & Schneider gave participants a memory set for targets to be searched for in the upcoming trial, they then had to press a key as soon as they saw a target, or another key for no target. What were the key IVs for automaticity?

A

Size of memory set (2 vs. 4 letters); categorical/consistent mapping (targets came from one set of letters, & distractors from another set); mixed/varied mapping (targets and distractors came from one item set)

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24
Q

In Shiffrin & Schneider’s study, what was found in the categorical condition?;
What about the mixed condition?

A

Accuracy cost for larger memory set (4 vs. 2) but after practice, there’s no effect of memory set size - evidence of automaticity;
It’s impossible to use a simple response rule & become automatic; there’s always a cost of having a larger memory set (even after nearly 10,000 trials)

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25
Q

How do automatic processes occur?;

What did Shiffrin & Schneider find that shows a downside to these last two characteristics?

A

Quickly, without awareness, conscious deliberation, or expenditure of resources; they’re rigid & habitual;
Participants had difficulty in the categorical condition when the assignment of items was reversed (difficult to unlearn responses)

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26
Q

Name two other examples of how automaticity might be a problem

A

Automatically reading a word that is looked at (Stroop task); & spread of activation in semantic networks in memory, (association of concepts, e.g salt activates pepper)

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27
Q

According to Logan, what’s automaticity based on?;

A

Knowledge acquisition (not all-or-none); we have separate memory traces for each encounter with a stimulus

28
Q

What does practice lead to, according to Logan?;

So according to this theory, what is automaticity?

A

Storage of information about the stimulus, how to respond to it, & rapid retrieval of it (in the absence of practice, thought and application of rules is required);
Memory retrieval – a single step direct-access retrieval of a past solution

29
Q

What are some problems with the traditional criteria for automaticity?

A

Capacity & interference (even well-practised tasks will display interference if stimuli & responses are similar (e.g. dichotic listening); mode of control (automatic processes are obligatory only when they relate to the intended action)

30
Q

In the Stroop task, if the word & colour have a clear spatial separation (e.g. in the periphery), what can be avoided?

A

Interference

31
Q

Describe some links between awareness & automaticity

A

Can have a lack of awareness in intentional tasks (e.g. aware of cue but not retrieval process); awareness of highly routine tasks (e.g. routine turn at an intersection); level of control is critical (automatic performance = when skill + input information specify task completely; other attentional mechanisms bring interference and awareness)

32
Q

If you mistakenly take a routine turn at an intersection, does this mean the action is unconscious?

A

No, rather, the link with the intention is lost (automatic pilot)

33
Q

Define Working Memory (WM)

A

It’s the domain of conscious thought; involved in making decisions and initiating actions based on plans & in response to environmental input; also involved in directing attention

34
Q

What components make up Baddeley’s WM model?

A

Central executive coordinates activity of the “slave” systems that store information: the phonological loop; visuo-spatial sketchpad; episodic buffer

35
Q

What does the Episodic Buffer do?

A

Links information across visual, verbal, and spatial domains

36
Q

Who is the Homunculus?;

Why is the homunculus a problem?

A

The one who “sees” & “interprets” the image mapped from the retina to the brain; decides which cognitive task should get priority in order to meet goals; inhibits processes that are irrelevant to the current goal;
Doesn’t make sense – who controls the controller?

37
Q

What is the Central Executive (CE)?;

Describe its structure or system of processes;

A

An attention controller that is an interface between WM “slave” systems and long-term memory (LTM) (does not have its own storage capacity);
May be hierarchical (controller at top) with control as the emergent feature (e.g. through mutual inhibition/activation)

38
Q

What are the functions of the CE?

A

Co-ordination of the subsidiary (slave) WM systems; control of encoding & retrieval strategies; switching of attention; mental manipulation of material held in the slave systems

39
Q

Random number/letter generation was thought to require the CE. But under pressure of concurrent CE demands, what do sequences become?;
Baddeley & colleagues have shown interference between random number/ letter generation and what?

A

Less random

Playing chess; reasoning; problem solving; generating items from semantic categories; mental arithmetic

40
Q

What does the Phonological Loop do?;

What 2 components does it consist of?

A
Maintain verbal, sequential information in a phonological (sound-based) code;
Verbal store (inner ear) & subvocal articulatory rehearsal process (inner voice)
41
Q

How soon does information decay in the phonological loop?;

Articulatory rehearsal also may be used to enter information into the store. Give some examples of these

A

After about 2 sec, unless maintained by rehearsal;

Remember phone number, recipe, instructions, in the short term; digit span

42
Q

List the 4 key effects of the phonological loop

A

Phonological similarity effect; Irrelevant (unattended) speech effect; Word length effect; Concurrent articulation effect (also called articulatory suppression)

43
Q

What evidence did Conrad & Hull find in support of the Phonological Similarity Effect?

A

Most confusion/errors in immediate serial (ordered) recall for letters with similar sounding names (e.g. B, G, V, P, T)

44
Q

Baddeley tested serial recall of phonologically similar vs. dissimilar 5-item sequences presented auditorily (e.g. mad, man, mat, cap, cad) & a control pool (cow, day, bar, few, hot). What was the difficulty in the similar condition?;
Is the effect due to the sound or spelling of the word?

A

Recalling order information (similar results for visual presentation);
Sound (effect found with caught, sort, taut, etc)

45
Q

What do confusions among phonologically similar items indicate?;
What does an absence of the phonological similarity effect suggest?;
Is it a characteristic of LTM or WM?

A

Use of phonological representations;
That participants have abandoned a phonological coding strategy;
WM (LTM usually shows semantic not phonological confusions

46
Q

Describe the Irrelevant Speech Effect (or unattended speech effect);
Does it depend on the meaning of the material?

A

Speech impairs serial verbal recall of visually presented material;
No, nonwords, Arabic and backward speech interfere (music sometimes interferes; white noise has no effect; intensity of auditory stimulus unimportant)

47
Q

What’s Baddeley’s interpretation of the Irrelevant Speech effect?

A

Obligatory access of speech-like input to phonological store; corruption of trace/added noise, rather than phonological confusion effect (can get impairment for materials that don’t produce a phonological similarity effect)

48
Q

Dylan Jones has an alternative view about the Unattended Speech effect. What is it?;
Instead, he proposes the Changing State Model. What is this?

A

There’s no privileged access for speech; can also get interference with tone sequences & music; don’t get interference with repetition of a single speech sound;
Elements in the study list may become linked to elements in the irrelevant speech stream, which impairs order information; it depends on the pattern of changes between 2 sound streams

49
Q

Describe the Word Length Effect;

What evidence did Baddeley, Thompson & Buchanan, find for this?

A

Immediate memory span declines with the spoken duration of the list items; (span is the largest number of items than can be correctly recalled in order);
They presented participants with short auditory lists (e.g. sum, hate, harm, wit) & long ones (e.g. association, opportunity, representative), & more short word sequences were correctly recalled

50
Q

When Baddelely et al. controlled the number of syllables, what did they find?

A

Lower accuracy for items with longer-duration pronunciation, not about syllables

51
Q

What does the Word Length Effect reflect?

Rehearsal involves central programming of speech but not what?

A

The speed of subvocal rehearsal and hence the rate of refresh of the memory trace;
Output (patients without vocalisation show rehearsal, but not those with impaired speech programming)

52
Q

At what age does the Word length effect begin?

A

In children around 4 years (developmental increases in speech rate are associated with increases in verbal recall)

53
Q

Cowan has an alternative view about the Word Length Effect. What is it?;
How do other studies contradict this view?

A

Delays at output are associated with the longer articulation time of long items;
They show the same deficit even with probed recall (e.g. was the item “representative” in position 3?)

54
Q

What evidence has been found in support of Concurrent Articulation (articulatory suppression)?;
How has this effect been interpreted?;
What components of articulation are important?

A

Repeating la-la, or hiya etc, adversely affects serial recall & abolishes the word length effect; the phonological similarity effect is removed by articulation with visual but not auditory presentation;
It eliminates subvocal rehearsal & impairs phonological recoding of visual material;
Hearing speech is not a major factor; silent articulation interferes, but not non-speech actions (chewing, etc)

55
Q

What is the Phonological Loop for?;
Brain injured patients with severely impaired verbal serial recall can understand and read most sentences except perhaps what?

A

Vocabulary learning in children, or learning a new language; comprehension of oral and written language, but only as a back up;
Very complex and “garden path” sentences (e.g. the horse raced past the barn fell)

56
Q

Visuo-spatial encoding rather than verbal encoding of material is perhaps processed in which lateral hemisphere?;
What tasks have been used to analyse the Visuo-spatial Sketchpad?

A

Right hemisphere;

Corsi tapping task, memory for un-nameable shapes/patterns, navigation & tracking

57
Q

What did Brandimonte & Hitch (1992) find about concurrent speech with visuo-spatial tasks?;
What does Baddeley suggests that V-S memory is based on?

A

Concurrent speech impairs verbal encoding of shapes (e.g. “umbrella”), but does not affect visuo-spatial encoding of shapes;
A visuo-spatial code that supports imagery

58
Q

Consistent with imagery research, Baddeley has recently divided the V-S sketchpad into which 2 components?

A

Visual cache, which stores visual patterns (e.g. layout of forms, shapes, etc); & Inner-scribe - spatially based rehearsal (e.g., of movement sequences - doesn’t require visual input; can be performed by blind participants)

59
Q

What did Logie & Marchetti find in relation to links between motor control & memory for spatial & visual patterns?

A

Arm movements in retention interval disrupt memory for spatial patterns but not visual (colour) information; visual interference task affects memory for colours but not spatial patterns

60
Q

According to neuropsychology, there’s a separation between knowing what an object is and knowing where it is. What did Hitch et al. find in regards to figure-ground information?;
What does this suggest about V-S memory?

A

Unmatched/different figure-ground information for 2 conjoinable figures impairs detection of conjoined figure in working memory task, compared to matched figure ground information
Organisation of V-S memory occurs at the level of objects

61
Q

Describe the functions of the Visuo-Spatio Sketchpad

A

Planning and execution of spatial tasks (e.g. sport, driving, etc); manipulating visual images (e.g. in skilled abacus users); keeping track of changes in the visual perceptual world; maintaining orientations in space and directing movement; comprehending certain verbal information (in navigation etc)

62
Q

The Baddeley model describes and organises some key facts about human short-term memory. What are they?;
What’s a limitation in this model?

A

Limitations of memory; coding & modality effects;

Insufficient development of how the stores interact and the interplay of WM and long-term memory

63
Q

Where Baddeley’s model is structural & focuses on passive stores, what do alternative models emphasise?;

A

Capacity & active processing (e.g. operation span task by Engle et al.); & span score, determined as longest sequence that can be recalled to a specified criterion; (used in individual differences research)

64
Q

According to Cowen’s (1998) theory, the idea of transfer of information into and out of stores does not capture what?;
What does he claim about LTM’s role?

A

The dynamic nature of WM;
Part of LTM memory is active in WM to meet the demand of the current task (e.g., text comprehension) this is accessible by fast-acting retrieval cues

65
Q

What brain networks do WM involve?;

What does WM function depend on?

A

Fronto-parietal (pure storage in posterior parietal lobe; rehearsal and executive functions in frontal lobe);
Activation by neurotransmitter dopamine, with regulation by inhibitory neurons

66
Q

According to Karlsgodt et al., Behavioural Brain Research (2011), to what extent is WM capacity genetically determined?

A

WM is highly heritable; genes identified for effects on neurotransmitter function & brain morphology (white & grey matter integrity) in the WM network; several separate biological causes of WM deficits