Eye Tracking

Question 1

What is the most used technology in eye tracking?

Answer 1

Optical tracking - Near-infrared technology & high-resolution camera

Question 2

When defining AOIs (areas of interest), what needs to be kept in mind?

Answer 2

AOIs need to be the right size, camera sampling rate needs to be high enough

Question 3

Fixation dwell

Answer 3

number of fixations in an AOI

Question 4

Heat maps

Answer 4

AOI-free way of visualising fixation dwell -fixation density. Sometimes weighted by duration - averaged over participants

Question 5

Saccade & microsaccade

Answer 5

Saccade - movement between fixations

Microsaccade - small, involuntary, jerk-like movement within a fixation

Question 6

Reflex controlling pupil diameter

Answer 6

PLR - pupillary light reflex

Question 7

Which part of the nervous system controls pupil constriction and dilation?

Answer 7

Constriction - parasympathetic NS

Dilation - sympathetic NS

Question 8

What is PDR and where would you find it (in psychology)?

Answer 8

Pupil dilation response. Found in arousal, cognitive load, memory load, LTM encoding and retrieval, surprise, motivation, emotions etc.

Question 9

Can pupil constriction indicate a mental state?

Answer 9

Sometimes - low-level equiluminant changes in stimuli (colour, motion) – reorienting pupil constrictions: selective attention(?) + Tonic constriction when executing a well-learned task