1. High frequency sounds are localized by interaural _________ differences, whereas low frequency sounds are localized by interaural __________ differences.

First blank	A. time	B. intensity	C. wavelength	D. pitch
Second blank	A. time	B. intensity	C. wavelength	D. pitch

2. Front-back distinctions in sound localization are made possible by the presence and absence, respectively, of reflections off the ridges of the pinnae.  T or F

3. The frequency response of the pinna colouration is similar to that of a ________ filter.

A. low-pass

B. high-pass

C. bandpass

D. comb

4. The differences in high frequencies reaching each ear are caused by their inability to _________ around the head.

A. reflect

B. diffract

C. diffuse

D. refract

5. Angular displacement in horizontal localization is called ___________.

A. projicience

B. azimuth

C. echolocation

D. phase

6. Which technique does NOT produce in-head localization in headphone listening?

A. phantom imaging

B. panning

C. kunstkopf recording

D. phasing

7. The HRTF for localization is characterized as having notches around 8 and 13 kHz. T or F

8. In monophonic mode the main spatial dimension is that of _________, whereas the stereophonic mode adds the dimension of _______.

First blank	A. laterality	B. space	C. height	D. depth
Second blank	A. laterality	B. space	C. height	D. depth

9. Cocktail party effect describes the ability to focus on a particular sound, such as a voice, in the midst of other sounds where the most important cue is its  _________.

A. timbre

B. direction

C. pitch

D. loudness

10. The auditory system's ability to supress later arriving sounds within about 40 ms, such as reverberation, is called ________.

A. echolocation

B. masking

C. cocktail party effect

D. precedence effect

11. Hearing loss may make it more difficult to focus on a particular sound in the presence of noise.  T or F

12. A phantom image is produced when a sound comes from two loudspeakers with equal ________ and the listener is exactly in the middle.

A. amplitudes

B. phase differences

C. time differences

D. echoes

13. When a signal is sent to multiple loudspeakers, and the level of one speaker is raised, as in electroacoustic diffusion, the speaker with the raised level is perceived as being the source of the sound, because of __________.

A. echolocation

B. masking

C. cocktail party effect

D. precedence effect

14. The area over which a sound wave can be heard may be measured and shown as the ________ of the sound.

A. acoustic horizon

B. isobel map

C. free field

D. acoustic profile

15. The acoustic horizon diminishes with rising ambient noise levels. T or F

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