Eye Tracking

Question 1

Anatomy of eye

Answer 1

Optic disc blindspot- info from photo receptor cells sent, processed in brain

Fovea- dense cones, coloured vision

Iris- allows light into eye, contracts to protect

Cornea- protective layer, focussing of light

Lens- final part of processing

Outer retina- rods process light and dark

Central vision- process colour

Peripheral vision- process black and white

Blind spot- no rods/cones

Question 2

Eye movements under differing task demands

Answer 2

Saccades- movement of eyes- most common types first stars, fixation then a saccades

Smooth pursuit- move eyes very steadily- type of tracking eye movement

Optokinetic nystagmus- flicking back of eyes to centre

Vestibular ocular reflex- eyes to be fixated on particular location, even with head movement mediated by cerebellum

Question 3

Gognitive goals

Answer 3

scan paths alter depending on cognitive goals

Question 4

Corneal reflection

Answer 4

Corneal reflection and beams combined give us an idea of where we are looking