Exploring The World With Our Eyes 2 Flashcards
What did Ben Tapler experiment
Reading- methods used to track eyes to see where people are looking whilst they look at an image or read
How has the visual system developed to be mobile
We have a high resolution part of the eye, the fovea, which picks up very small changes in space
Cells are different at the back of the eye, where motion and colour are picked up
Cones and rods
What did Yarbus 1967
Gave p’s questions about images and found their eye movements changed depending on the question
When asked ‘age?’ Looked mainly at people
When given ‘free examination’ eyes wandered everywhere
What are saccades
Rapid ballistic movements in a short duration (15-100ms)
Effectively blind during saccades, eyes move so rapidly
‘Saccadic suppression’ stops motion blur from disturbing our perception of the world
usually followed by fixation periods
What if fixation
For a short time period it is essential to examine a target in detail
If we fixate for too long are eyes and detail become fatigued
Essential for detecting info at that point
What is a microsaccade
Very small movements which stop us from fixating for too long
What is smooth pursuit
Eye movements which allow the eyes to closely follow a moving object
Effective pursuit requires the system to make predictions about the moving target
What is vestibule ocular reflex
The reflex by which the direction of the eyes remain constant when the head is moved
Uses signals from vestibular system
What is nystagmus
Rapid involuntary movements of the eye
When the large head turns Optokinetic nystagmus relies on smooth pursuit and saccades
What is vergence
The simultaneous movement of the pupils of the eyes towards or away from one another during focusing
Much slower process
Converging by 3 degrees would have a peak velocity
What do eye disorders usually lead to
Eye muscle and nerve discovers such as Nystagmus and Diplopia
