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ISE 210 > Lecture 8A: Physiological Measures > Flashcards

Lecture 8A: Physiological Measures Flashcards

1
Q

What kind of evidence does eye tracking provide about a user’s visual processes?

A

objective and quantitative evidence

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2
Q

What can’t eye tracking be impacted by?

A

subjective thoughts

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3
Q

What is the eye-mind hypothesis?

A

where participants are looking indicates what they are processing

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4
Q

How does eye tracking work?

A

Near IR light shines onto the cornea which reflects back to and is tracked by the IR camera

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5
Q

What are the two types of eye tracking?

A

screen based (stationary)
eye tracking glasses (head mounted)

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6
Q

What are fixations?

A

spatially stable glazes during which visual processing occurs; characterized by location and duration

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7
Q

What is the range for the duration of a fixation?

A

100-300ms

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8
Q

What is a saccade?

A

the rapid eye movements in between successive fixations

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9
Q

What is a scan path?

A

sequence of fixations and saccades

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10
Q

What is the area of interest?

A

regions of the display on which analysis is conducted, generally defined by the experimenter

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11
Q

What is gaze/dwell?

A

series of fixations within a particular area of interest, beginning with the first fixation on that AOI and ending with the last fixation inside of that AOI

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12
Q

What does a large total fixation number mean?

A

indicates additional or unnecessary information that’s being processed the larger the number gets

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13
Q

What does a high value mean fixation duration represent?

A

high amount of clutter, difficulty extracting information; could also mean that people are interested in the targets

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14
Q

What is the scan path length?

A

the total length of the scan path from the first to the last fixation; shorter scan paths indicate a more efficient search

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15
Q

How does pupil size correlate to workload?

A

pupil size increases with increasing workload/task demands

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16
Q

What is the blink rate?

A

number of blinks per second

17
Q

Besides scan paths, what’s another way to visualize eye tracking? what is it’s limitation?

A

heat map; doesn’t give sequence information

18
Q

What are three problems with eye tracking?

A

cannot track peripheral vision
debate about eye mind hypothesis
shows where but not why

19
Q

What is PPG (photoplethysmography)

A

heart rate monitor that uses a light source to measure variations in reflected light intensity associated with pulses

20
Q

What is ECG (electrocardiography)?

A

heart rate monitor that measures the electrical activity of the heart

21
Q

What is heart rate?

A

number of heart beats per minute

22
Q

What is heart rate variability?

A

fluctuation in the time intervals between adjacent heartbeats

23
Q

How is heart rate correlated to workload?

A

higher HR and shorter R-R (lower HRV) under high cognitive workload

24
Q

What is galvanic skin response (GSR) or skin conductance response?

A

an objective transient indication of autonomic nervous system arousal in response to a stimulus

25
Q

How is sweat gland activity correlated to emotional arousal?

A

higher sweat gland activity is correlated to higher arousal

26
Q

What are the units of skin conductance?

A

microsiemens or microohms

27
Q

When does skin conductance increase?

A

as people get nervous

28
Q

What is EEG (electroencephalography)?

A

a test that measures abnormalities in your brain waves, or in the electrical activity of your brain; can measure mental states

29
Q

What does EEG measure?

A

cognitive state
mental workload
sleep research
emotion state
wakefulness, alertness
attention

30
Q

What is a standard method for EEG analysis?

A

frequency-domain analysis, categorizes EEG signals into different types of brain waves according to their frequency

31
Q

What is higher frequency brain waves associated with?

A

more alertness

32
Q

What is the EEG frequency range?

A

1-30HZ; meditation to anxiety

33
Q

What is motion capture?

A

process of recording the movement of objects or people

ISE 210 (10 decks)

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