By Alfred L. Yarbus (auth.)

Show description

Read or Download Eye Movements and Vision PDF

Best allied health professions books

Enhancing Food Safety: The Role of the Food and Drug Administration

Contemporary outbreaks of health problems traced to infected sprouts and lettuce illustrate the holes that exist within the procedure for tracking difficulties and fighting foodborne illnesses. even though it isn't really completely liable for making sure the protection of the nation's meals provide, the U. S. meals and Drug management (FDA) oversees tracking and intervention for eighty percentage of the foodstuff provide.

The Multisensory Handbook: A guide for children and adults with sensory learning disabilities

Do you aid a baby or grownup with sensory perceptual matters or cognitive impairment? for individuals with tough sensory and cognitive stipulations, daily life can turn into so unpredictable and chaotic that over the years, loss of engagement can usually result in a kingdom of realized helplessness. during this insightful textual content, Paul Pagliano indicates how ‘learned helplessness’ could be remodeled into realized optimism via multisensory stimulation, and explains how a programme of help might be designed and modulated to check the person’s wishes, pursuits and talents.

Additional info for Eye Movements and Vision

Example text

17, is used to record the pulsations of the eye. The frame of the apparatus 2 and the hollow side-piece 14 are made of rubber. The hollow side-piece is joined by the opening 15 to the lower chamber 3 of the cap, in which is created the reduced pressure necessary for securing the apparatus to the eye. Fig. 17. The P5 cap. 34 CHAPTER I The lower chamber 3 of the cap is bounded below by the cornea of the eye 1, at the sides by the frame of the cap 2, and above by a thin rubber diaphragm 4 to which is secured a flat rubber button 6, lightly pressing on the cornea.

A beam of light reflected from the mirror was transmitted to a photoelectric cell. By this method, both horizontal and vertical movements of the eyes could be recorded. Shackel (1960) described a method which could be used to study the movements, not only of the eyes, but also of the head. A television 28 CHAPTER I camera, affixed to the subject's head recorded the field visible to the eye. The apparatus recording the eye movements transmitted to the same screen a small spot of white light corresponding, with a certain degree of accuracy, to the point of fixation at each particular moment.

Sometimes special discs and vanes are used to change the brightness and color of the light falling on the frosted glass or the screen in accordance with a given pattern. However, no explanation is required of the construction of these devices. When using the P s , P 7, and P s types of cap, the experiments are best carried out in conditions under which the subject's face is turned upward, and the fixation point for the second eye lies on the ceiling. An armchair with a low back, with a controllable device for maintaining the head in the required position, may be used for this purpose.

Download PDF sample

Rated 4.86 of 5 – based on 48 votes