301 Spring 2018 Final Exam.docx- Edited Times : 8) In vision, the brain processe

Question

301 Spring 2018 Final Exam.docx- Edited Times : 8) In vision, the brain processes A) the absolute amount of light in each location peceived by the retina. B) a mirror image of the visual scene. ) the differences in the amount of light between two points. D) the differences in the amount of light between the green and yellow wavelengths. E) All of the above. 9) The trichromacy theory is supported by the fact that A) we have three types of cones. B) we have three types of rods. C) we can't perceive a reddish-green or a bluish-yellow color D) color is coded by three opponent channels. E) motion information is transmitted via the m-pathway 10) Which of the following is NOT a part of the organ of Corti? B) basilar membrane A) outer hair cells C) tympanic membrane E) inner hair cells eri a 1 1) Interaural time differences ity A) allows us to hear separate frequencies of sound B) allow us to locate the source of a sound. eact C) is dependent upon acoustic "shadow). D) allow us to differentiate timbre of different musical instruments. E) All of the above. the reason for this choice of control live due and Cho

Explanation / Answer

8.(A) The eye is able to focus and control the amount of light the retina is exposed to. It has neurons that facilitate both clear, detailed vision in well-lit conditions and basic, generalized sight in dim lighting.

9.(A) Each of the three types of cones in the retina of the eye contains a different type of photosensitive pigment, which is composed of a transmembrane protein called opsin and a light-sensitive molecule called 11-cis-retinal. Each different pigment is especially sensitive to a certain wavelength of light (that is, the pigment is most likely to produce a cellular response when it is hit by a photon with the specific wavelength to which that pigment is most sensitive). The three types of cones are L, M, and S, which have pigments that respond best to the light of long (especially 560 nm), medium (530 nm), and short (420 nm) wavelengths respectively.

10. (C) In the anatomy of humans and various other tetrapods, the eardrum, also called the tympanic membrane or myringa, is a thin, cone-shaped membrane that separates the external ear from the middle ear.

11.(B) The interaural time difference (or ITD) when concerning humans or animals, is the difference in arrival time of a sound between two ears. It is important in the localization of sounds, as it provides a cue to the direction or angle of the sound source from the head.

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