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Midterm

PSYC 211 Study Guide - Midterm Guide: Vestibular Duct, Tectorial Membrane, Basilar Membrane


Department
Psychology
Course Code
PSYC 211
Professor
Yogita Chudasama
Study Guide
Midterm

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NEURO&&
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Audition:&&
Sounds&vary&in&pitch,'loudness'&'timbre.&They&are&vibrations&of&air&molecules&that&are&produced&by&
objects&
If&the&vibration&ranges&between&30&and&20,000&times&per&second,&it&stimulates&receptor&cells&in&
the&ears&&
Pitch:'determined&by&the&frequency&of&vibration&measured&in&Hertz&(cycles&per&second)&&
Loudness:&function&of&intensity.&More&vigorous&vibrations&of&an&object&produce&more&intense&sound&waves&
and&hence&louder&ones.&&
Timbre:&provides&information&about&the&nature&of&the&particular&sound,&complexity&of&the&sound&&
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Sound&is&funneled&through&the&pinna&(external&ear)&through&the&ear&canal&to&the&tympanic&membrane&
(eardrum),&which&vibrate&with&sound.&These&vibrations&are&transferred&to&the&middle&ear&&
Middle&ear:&hollow&region&behind&the&tympanic&membrane,&contains&ossicles&&
The&malleus&(hammer)&&
Incus&(anvil)&&
Stapes&(stirrup)&&
These&transmit&vibration&to&the&cochlea,&through&the&oval&window&
The&cochlea&is&part&of&the&inner&ear&and&is&filled&with&fluid&
Scala&vestibuli&
Scala&media&
Scala&tympani&
The&organ&of&Corti:&is&surrounded&by&the&three&sections&of&the&cochlea&
Basilar&membrane&&
Hair&cells&&
Tectorial&membrane&&
Hair&cells:&auditory&receptor&cells&anchored&by&Deiter’s&cells&to&the&basilar&membrane&&
The&cilia&of&the&hair&cells&pass&through&the&reticular&membrane&and&some&of&the&ends&attach&to&
the&fairly&rigid&tectorial&membrane&&
Sound&waves&cause&the&basilar&membrane&to&move&relative&to&the&tectorial&membrane,&which&
bends&the&cilia&of&the&hair&cells&which&produces&receptor&potentials&&
The&bending&of&the&basilar&membrane&is&determined&by&the&frequency&of&the&sound:&&
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