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Cognitive Neuroscience > W2 Internal Processes > Flashcards

W2 Internal Processes Flashcards

1
Q

What are 3 ways to study internal psychological processes?

A
  1. Self reports, eg. likert scales
  2. Peripheral physiological measures, eg. heart rate, skin conductances
  3. Neuroimaging - measuring activity of the amygdala, cannot use TMS in subcortical areas, only stimulus the cortex
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2
Q

What are pros/cons for using peripheral physiological measures?

A

Pro = good for overt emotional responses

Con = less precise for more subtle emotional responses, eg. distinguishing between fear/disgust

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3
Q

What are 4 ways we can operalisationise attentional breadth?

A
  1. Navon task - checking RTs for global and local level, expecting to see slower performance on incongruent tasks, ie. identifying the local letter in a different global letter
  2. Cueing paradigm - to measure breath, spatial extent of cue in different spatial locations to target, getting cueing effect in large spaces indicates broad attentional breadth
  3. Flanker task in high and low perceptual load
  4. Spatial distribution of IOR
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4
Q

What is alternate form reliability?

A
  1. same participants are tested with one form of the same test, if people score high on the global measures task, they should also have a breadth attentional breadth on the IOR = these tasks should be measuring the same construct
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5
Q

If non-correlative results found with attentional breadth, how can we test if these tasks are really measuring attentional breath?

A
  1. = try to rule out other related internal processes that could be measured in these tasks, eg. shifts of attention (divergent evidence)
  2. Combining with psychological measures, ie. saccadic eye tracking, people show narrow activation in primary visual cortex in fMRI scans (zoom lens model, narrow lens = higher perceptual enhancement, broader vision = lower resolution)
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5
Q

What internal process does the mental rotation of shapes study?

A

mental imagery

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6
Q

What internal process does the Stroop Effect test?

A

Studies the automaticity of reading

(Incongruent / stroop effect = semantic meaning and colour are mismatched and incongruent, more errors and slower RTs)

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6
Q

How do we study synesthesia scientifically?

A

the synesthetic Stroop task =

Synesthetic Stroop = suffering interference in naming the word when there is a different between their synesthetic colour and its physical colour

Get your synesthete colours and compare RTs between synesthete colours and random colours, should be faster at synesthete coloured words

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7
Q

What internal process does the Posner cueing paradigm study?

A

Measures attentional orienting

Responses are faster on ‘valid’ trials on the target compared to ‘invalid’ trials on the target

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7
Q

What are the neural findings for synesthesia?

A
  1. Giving synesthetes with letters/numbers leads to activation in colour regions of visual processing (V4/V8)
  2. left hemisphere activation in the left medial lingual gyrus - implicated in colour knowledge
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8
Q

What does the DTI imaging show in synesthesias in relation to neural connectivity?

A

DTI shows synesthesia has greater white matter (neuron axons / connectivity) in the inferior temporal cortex (esp. For projectors)

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9
Q

Is colour processing the same as visual imagery?

A

Synesthetic colour experience is qualitatively distinct to visual imagery

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9
Q

What are the 3 life outcomes associated in people with synesthesia?

A
  1. Highly enjoyable and integral to life
  2. associated with creativity
  3. Better memory in memory tests because of additional cue of colour in recalling a stimulus
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10
Q

What is a construct vs. operationalisation?

A
  1. Construct = a theoretical psychological concept, eg. attention, self-esteem
  2. Operationalisation = methods for instantiating manipulations/ measurements of constructs, they are the objective perimeters of the construct, eg., attentional blink
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11
Q

What influences the accuracy of a study?

A

the extent to which the construct and operationalization are closely aligned

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12
Q
  1. BMI is an operationalisation of ….
  2. Number of days with low mood
  3. Global precedence effect / Navon task
A
  1. Physical health
  2. Psychological health
  3. Attentional breadth
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13
Q
  1. semantic processing
  2. fear processing
  3. proxy of SES
A
  1. words and non words
  2. fmri of fearful vs. neutral
  3. postcode
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14
Q

What is the biggest challenge in studying internal processes?

A

Hard not to accidentally manipulate another variable or the intended variables studied, eg.

15
Q

What is an example of neglecting to consider another third variable?

A
  1. the broad and build model

The broaden and build model doesn’t consider arousal in its theory of emotion, and only measures valence of emotion
But valence of emotion is directly linked with arousal - thus the differences in A.B could be partially due to arousal and not just valence of emotion

16
Q

How does hypothesis relate to theories?

A

hypotheses are derived from theories

17
Q

What is falsifiability in theories?

A
  1. Cannot preclude any type of objective measurement
  2. Adding caveats to theories that suggest there is something connected/present but is indetectable is making a theory UNFALSIFIABLE
18
Q

What is an example of a falsifiable, testable theory?

A
  1. hypothesis = “anger makes people want to approach things”,
  2. method = ask people to watch an anger inducing film and self report and find people want to avoid
  3. argument = proponents of this theory could claim that people have an unconscious problem with motivation to self-report
  4. = testing/falsifying = Motivation would then have to be testable in this theory, eg. through ERPs otherwise it turns into being unfalsifiable
19
Q

What is an example of descriptive vs. explanatory?

A
  1. Descriptive: “focused attention enhances spatial acuity”
  2. Explanatory: “focused attention causes the shrinking of receptive fields around the attended location - enhances spatial acuity”
20
Q

What is the caveat to explanatory theories?

A

Caveat = Just because predictors for an explanatory theory get supported, it doesn’t mean the explanation is solely correct, eg. P-cells might be activated in focused attention

21
Q

How do we distinguish different explanatory hypotheses? / p and m cell example

A
  1. Check P and M cells, neuroimaging, behavioural measures in testing temporal acuity to see if M cells are implicated in spatial or temporal acuity, eg. what happens to temporal acuity in focused attention at an attended location?

Second model predicts M is better at temporal and P is better at spatial, so at an attended location, M-cells/temporal acuity would be impaired to support this hypothesis

22
Q

Recap = what is the early vs. late perceptual load theory?

A
  1. Early selection of attention - attentional selection occurred EARLY in processing, unattended information was NOT PROCESSED
  2. Late selection of attention - attentional selection occurs LATE in stimulus processing, unattended information is PROCESSED
23
Q

Recap = what is the perceptual load theory?

A
  1. Early or late selection is dependent on current perceptual LOAD
  2. When perceptual load is high = early processing / unattended info is not processed
  3. When perceptual load is low = late processing / unattended info is processed, attentional resources are spread around
24
Q

Why is the perceptual load theory good?

A
  1. Makes clear predictions
  2. Falsifiable
  3. Explanation for why both early and late processing evidence is present
  4. Good converging evidence
25
Q

What part of the brain is the amygdala in and what does it do?

A
  1. Amygdala is a subcortical part of the limbic system (older phylogenetic / primitive
  2. implicated in fear, fear conditioning and fear-relevant stimuli, eg. spiders, fearful facial expressions, anf emotions of high positive/negative VALENCE
26
Q

What are the 2 types of dimensions in emotion theory?

A
  1. Categorical approach
    number of discrete and basic categories of emotion that are universally recognised, fear, disgust, and have different behaviours
  2. Dimensional approach - emotions can be distilled down to values of key dimensions,
    arousal (intensity) AND
    valence (pos/neg), eg. anger and fear are similar since both have high arousal and valence
27
Q

What is evidence for the dimensional approach of emotion?

A

The brain appears to be sensitive to both valence and arousal
Fear and disgust as categories seem to explain brain activation even after controlling for valence and arousal

27
Q

What is the difference between fear and disgust?

A
  1. Fear expands our scope of sensory information and causes rapid processing
  2. Disgust restricts our sensory information, eg. reducing amount of air to breathe in, protests us from pathogens
28
Q

What was the Bocengra and Zeelenberg (2011) study?

how does this show a bias towards m-cell precedence?

A
  1. A fearful or neutral face is presented
  2. A ring (ring with gap or no gap) is present on one side of screen

Spatial task = did the ring have a gap or no gap?
Temporal task = was the ring always present or did it disappear?

Findings: after a fearful face, people are more sensitive to temporal gaps and less sensitive to spatial gaps compared to a neutral cue, shows bias towards m-cells in fearful processing, measuring the spatial and temporal gap

28
Q

How are m and p cells implicated in fear processing?

A

Fearful faces appear to induce spatiotemporal tradeoff in processing,
- bias to magnocellular cells (larger cells, poorer spatial resolution, better temporal)
- compared to parvocellular neurons

29
Q

What is the Bocengra and Zeelenberg (2009) study with gabors? / convergent evidence with their previous study

A
  1. After shown a fearful/neutral task, presented with a gabor (stripped lines) and asked to make a judgment on its orientation
    IV: the spatial frequency of the gabor

Findings =
After a fearful face, people were worse at judging gabors with fine SPATIAL details, indicating that fear processing results in a bias AGAINST P-CELLS and towards M-CELLS

30
Q

Why are m-cells implicated in fear?

A

when we see a fearful face, it indicates there is some danger nearby/imminent, magnocellular neurons seem to be processed more to engage in faster speed processing of our surroundings to detect the threat and respond

31
Q

Conceptual - What effects would a disgust stimuli elicit in a gabor task?

A
  1. Disgust might elicit p-cells because it would narrow down perceptual resolution

Or faster processing to identify the disgusted stimulus for m-cell hypothesis?

Are neutral faces really a good baseline as a comparison? How specific are these affects to these specific emotions?

32
Q

What is other evidence for fear vs. disgust neural basis?

A
  1. Adopting a fearful expression enhances sensory acquisition
  2. Adopting a disgusted expression reduces sensory acquisition
33
Q

Susskind et al. (2008) = What is the functional value of fear and disgust?

A
  1. FEAR enhances sensory acquisition, related to rapid processing and detecting peripheral stimuli to detect predators, eg. M-cell hypothesis supported
  2. Disgusted expression reduces senses, because it suggests there is a pathogen/disease nearby, eg. reducing the amount of air breathing in, protecting us from things that might make us sick
34
Q

What are the findings on sensory differences / eyes / breathing in fear vs. disgust?

A
  1. Fearful expression: faster detection of peripheral stimuli, faster saccades, increased nasal inhalation capacity
  2. Compared to neutral, disgusted expression: decreased detection of stimuli, slower saccades and reduced nasal inhalation
35
Q

What other type of emotive stimuli could we add to distinguish between fear and neutral faces?

A

adding POSITIVE valence, as it makes different predictions then a threat/fear-based explanation of attention

36
Q

What are 2 alternative explanations of fear processing?

A
  1. threat/fear-based explanation = high attention because of evolution/fear-flight OR
  2. emotive-based explanation = empathy attention towards emotion of any valence
37
Q

Recap = how to operationalise construct of motion processing being implicated in V5 / MT+ with DIVERGENT EVIDENCE?

A
  1. getting a similar perceptual process like looking at static objects and check whether v5 is active

Cognitive Neuroscience (6 decks)

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