Exam 2: The Beginning of the Perceptual Process

 The three major parts of a neuron are _____.

 Convergence results in _____ sensitivity and _____ acuity.

 Lorelei's mother is 60 years old, and, because of the condition called _____, she has a difficult time bringing near objects into focus.

 The isomerization of a single pigment molecule triggers what is best described as a _____.

 Nina does a demonstration of "seeing" the blind spot, in which a grid pattern surrounds the black dot that disappears when it falls on the blind spot. What does Nina most likely see in the area where the dot disappears

 Name and define three kinds of focusing problems.

 The ciliary muscles change the shape of the _____, providing about 20% of the eye's focusing power.

In words and/or diagrams, discuss why convergence of the rods results in increased sensitivity, but decreased acuity. (b) In words and/or diagrams, discuss why the lack of convergence in the foveal cones results in decreased sensitivity, but increased acuity.

 The peak in the spectral sensitivity curve is about _____ for the rods, and about _____ for the cones.

 Reading the eye chart in an optometrist's office is used to measure _____.

 The visual pigment molecules are contained in the _____.

 A retinal condition that destroys the cones in the fovea is _____.

 The stimuli used in the preferential looking technique of testing infant acuity are _____.

 ______ is the process by which inhibitory transmitters cause the inside of the neuron to become more negative.

 The structure of the eye that provides about 80% of the eye's focusing power is the _____.

 The difference in charge between the inside and the outside of the nerve fiber when the nerve is at rest is _____ mV.

 Which of the following is a reason for the poor acuity of newborns

 The "rod-cone break" in the dark adaptation curve occurs after about _____ in the dark.

 Cone spectral sensitivity is measured by having the observer _____.