Chapter 3 Study Guide
1. The ability to distinguish sensations does not depend on differences between sense organs but rather:
On the part of the brain activated by the sensory messages.
2. What factors influence which of the many physical events that are bombarding each of the sensory
systems get transduced into neural information?
1) Sensory thresholds
3. In mathematical form Weber's law is stated l=kl, what does this mean in "English"?
That the jnd is always a constant fraction of the original stimulus
4.Aperson living near an industrial plant producing foul-smelling smoke will not notice it after a while
5. The sensory system that is slowest to adapt is:
6. Signal detection theory describes two kids of noise that could interfere with the perception of the
sensory stimuli. They are:
Internal activity and external environmental stimuli
7. The ____ is a muscular membrane that regulates the amount of light entering the eye.
8. The focusing process in which the lens adjusts its shape depending on the distance between the eye
and the object viewed in order to project a clear image onto the retina is called:
9. In very dim, low intensity light, vision is diminished. If we look directly at an object, we may not see
it because we are focusing the available light onto the:
Fovea, where there are only cones
10. Mach bands are an example of:
11.Also known as the Young-Helmholtz theory, the ___________________ stated that the human eye
contains red, green, and blue color receptors which form the basis for our perception of all colors.
12. Given our present knowledge about color vision, which two theories seem nearest to the truth?
1) The trichromatic theory
2) The opponent-process theory
13. The pitch difference between various musical notes can be attributed to differences in:
The frequency of the sound waves 14. The correct order which a sound stimulates structures in the ear is:
Eardrum, ossicles, oval window and cochlea
15. Which theory states that perception of low tones depends on the frequency with which auditory hair
cells in the inner ear trigger firing of neurons in the auditory nerve?
16. Which of the two theories of pitch discrimination is believed to be more accurate by today's