Psych 304 Lecture Notes - Nov.18th

Psych 304 Lecture Notes - Nov.18th - Psych 304 Lecture...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Psych 304 Lecture Notes Nov.18 th , 2008 Auditory Lecture: Sound Waves: - sounds are vibrations of air molecules that stimulate the auditory system - unlike visual stimuli, sounds can go around obstacles and they work as well in the dark as in the light Frequency: - cycles per second - measured in Hertz (Hz) - pitch = our perception of frequency (increased frequency = higher pitch; decreased frequency = lower pitch) - humans hear between 20 - 20000 Hz Amplitude: - intensity or loudness - sound pressure measured in decibels (dB) - sound intensity at the Lions vs. Riders game on Sunday? - Riders practiced with 8 large speakers at 110 decibels (normally - game was “within 5-10% of a jet engine” at BC place - that's pretty loud considering the threshold of pain from sound is 130-140 decibels - threshold of hearing = 0 - whisper at 3 feet = 20 - very quiet; normal conversation at 3 feet = 60 - very annoying; prolonged exposure produces damage to hearing = 100 - threshold of severe pain; risk hearing loss = 140 - high-amplitude sound waves such as those generated by a rock band have greater energy than low- amplitude waves and a greater impact on the sensitive structure of the ear How do small vibrations of air molecules become the speech, music and other sounds we hear? How is the mechanical force of sound transduced into neural activity? Auditory System: - outer ear - middle ear - inner ear - transduction of mechanical energy into neural activity - auditory neural pathways - Picture of ear from textbook Outer Ear: - captures, focuses and filters sound - Pinna: - shape - modifies character of sound that reaches the middle and inner ear and aids in sound localization (some frequencies are enhanced (eg. Human speech), other frequencies are suppressed) - function - channel sound waves into the ear canal
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/09/2009 for the course PSYC 304 taught by Professor Comeau during the Fall '08 term at The University of British Columbia.

Page1 / 4

Psych 304 Lecture Notes - Nov.18th - Psych 304 Lecture...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online