Week 9.1 Auditory Percep

Question 1

what is sound

Answer 1

waves of changing pressure travelling through air

Question 2

a pure tone has

Answer 2

an amplitude
a frequency

Question 3

amplitude is

Answer 3

maximum air pressure in each cycle

Question 4

frequency is

Answer 4

number of cycles of changing air pressure per second

Question 5

in pure tone, perceived pitch is equivalent to

Answer 5

frequency

Question 6

natural sounds consist of

Answer 6

pure tones of many frequencies added together

Question 7

perceived loudness is related to

Answer 7

amplitude

Question 8

increasing amplitude 10x causes loudness to

Answer 8

increase approx 4x

Question 9

auditory transduction occurs in

Answer 9

cochlea
basilar membrane
hair cells

Question 10

hair cells are X that transduce X that send X

Answer 10

mechanoreceptors
transduce vibration of the basilar membrane
send elec signals to brain through auditory nerve

Question 11

place coding of sound frequency in the cochlea

Answer 11

each part of basilar membrane vibrates to particular frequency
frequency = highest at base (oval window)
lowest at tip (apex) of cochlea
- each hair cell signals amplitude of one range of frequencies in the sound

Question 12

perception of loudness is based on

Answer 12

firing rate of hair cells

Question 13

max range of frequencies a person can hear

Answer 13

20Hz - 20kHz

Question 14

3 physical dimensions of sound

Answer 14

frequency
amplitude
complexity

Question 15

3 dimensions of sound determine what we hear

Answer 15

pitch
loudness
timbre

Question 16

LCD

Answer 16

frequencies in sound = integer multiples of a single number = least common denominator (LCD) of component frequencies

Question 17

harmonic structure

Answer 17

complex sounds where all components share an integer LCD

Question 18

fundamental frequency

Answer 18

the lowest frequency component of the sound