Although she is normally not aware of its existence, Ingrid discovers that she has a blind spot in her vision by closing one eye and focusing on a fixed point. What explains why Ingrid has this blind spot in her vision?
A) She suffers from retinal degeneration.
B) She is experiencing sensory adaptation.
C) No photoreceptors are located where the optic nerve leaves the eye.
D) There is insufficient light to activate her rods.
Answer: C
Rationale: Each eye has an optic nerve, a cluster of neurons that gathers sensory information, exits at the back of the eye, and connects with the brain. This nerve presents a challenge to the brain. Because it travels through the back of the eye it creates an area in the retina with no rods or cones, called the optic disc. The result is a blind spot—a space in the retina that lacks photoreceptors.
You might also like to view...
The tendency of the body to maintain a balanced internal state is called __________
a) arousal. b) homeostasis. c) drive. d) biological motives.
The Supreme Court case which defined "treatment" of offenders is:
A. Knecht v. Gillman. B. Washington v. Harper. C. Ewing v. California. D. Lockyer v. Andrade.
A subject who has a choice between an FR 10 and an FR 30 will eventually
a. spend 3 times longer on the FR 10. b. spend 50 percent of its time on each schedule. c. spend most of its time on the FR 30. d. spend all of its time on the FR 10.
A child cannot bake cake alone, but the task is within the child's Zone of Proximal Development, because she can perform this task _____________.
A. if she is motivated with avoid punishment B. if she is motivated to receive a reward C. within the next 2 years D. with the help of an adult