{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture8-08 - Describe 2 kinds of eye movements and their...

Info icon This preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Describe 2 kinds of eye movements and their function.  
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Types of Eye Movement Information Gathering Stabilizing Voluntary (attention) Reflexive Saccades vestibular ocular reflex (vor) new location, high velocity, ballistic body movements Smooth pursuit optokinetic nystagmus (okn) object moves, velocity, slow    whole field image motion Vergence change point of fixation in depth slow, disjunctive  (eyes rotate in opposite directions) (all others are conjunctive ) Fixation:  period when eye is relatively stationary between saccades.
Image of page 2
Describe foveal over-representation in the visual cortex.  Give a reason for this over-representation. Draw a diagram to  illustrate your answer.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Cortical  Magnification Larger cortical area for neural projections  from the fovea than periphery Primary Visual Cortex: V1 Draw a diagram to illustrate your answer.
Image of page 4
A reason for this over-representation:   High density of cone photoreceptors in central fovea (also ganglion cells)
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
What is the Perception-Action Cycle? Give an example.
Image of page 6
cat  image  neural activity   reach,  pick up  cat moves  afferent  signals  efferent  signals    recognize, locate    cat     compute  movement    Perception   Action Cycle  200 msec  500 msec Perceptions and action form a continuous loop: Sensory information leads to actions which the alter  incoming sensory information.
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Describe the specialized gaze patterns found  by Land in cricket. 
Image of page 8
Eye movements in cricket: Batsman anticipate bounce point Better batsman arrive earlier Land & MacLeod, 2001 pursuit saccade 1) Batsman fixates the bowler’s hand  2) Makes a saccade to the anticipated location of the bounce.   3) This is followed by a smooth pursuit movement after the bounce.  The  bounce point  gives information about where and when to swing the bat.
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Describe your results in the ball-catching lab. Did you find the same basic pattern as Land did? How did your results differ? 
Image of page 10
Catching: Gaze Patterns Catcher Thrower saccade X X smooth pursuit X
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Draw a sketch of the brain showing the structures involved  in the generation of a saccadic eye movement. Specify the  function of these structures (to the extent that this is possible)
Image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern