Across
- 3. the adjustable opening in the center of the eye through which light enters
- 5. the nerve that carries neural impulses from the eye to the brain
- 6. a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening
- 7. the minimum stimulation needed to detect a particular stimulus 50 percent of the time
- 8. an organized whole
- 11. the controversial claim that perception can occur apart from sensory input
- 13. the point at which the optic nerve leaves the eye and no receptor cells are located here
- 14. detect fine detail and give rise to color sensations. Used in well-light conditions
- 15. a coiled, bony, fluid-filled tube in the inner ear through which sound waves trigger nerve impulses
Down
- 1. a binocular cue for perceiving depth:By comparing images from the two eyeballs, the brain computes distance - the greater the difference between the two images, the closer the object
- 2. the focusing of conscious awareness on a particular stimulus, as in the cocktail party effect
- 4. retinal receptors that detect black, white, and gray. Used for twilight vision
- 9. the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount)
- 10. the tendency for vision to dominate the other senses
- 12. below one's absolute threshold for conscious awareness