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PSYB51H3 (306)
Chapter 10

Chapter 10 Notes

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Department
Psychology
Course
PSYB51H3
Professor
Matthias Niemeier
Semester
Fall

Description
Chapter 10: Hearing in the Environment Sound Localization Sounds are processed in same place in ear no matter where it comes from Having 2 ears allows us to tell location o Closer objects heard at one ear first (timing), intensity greater (louder) Interaural Time Difference Interaural time difference (ITD): diff in time btw sound getting to an ears Azimuth: angle of object relative to imaginary circle around us o i.e. horizontal plane Largest ITD is at extreme LR (90) w delay of 640 microseconds o As we move further away from extremes delays are less Directly to the front and back, there are is no ITD PHYSIOLOGY OF ITDs Medial superior olives (MSOs): relay station in brain stem, inputs from ears combine to detect ITD ITD detectors form connections in first few months of life Size of head is important for interpreting ITDs Interaural Difference Interaural level difference (ILD): diff in intensity btw sound arriving at one ear o Similar properties as ITD Sounds more intense for closer ear ILD largest at extreme LR (90), none at frontback Btw angles not as correlated bc of head shape ILD greatest for high freq tones o Because low freq bends better o ILD is almost zero below 1000Hz (low freq) PHYSIOLOGY OF ILDs Lateral superior olives (LSOs): relay station in brain stem, inputs from ears combine to detect ILD LSO is excitedinhibited o Excited by ipsilateral ear e.g. excitatory connections from L LSO comes from L cochlea o Inhibited by contralateral ear Via medial nucleus of trapezoid body (MNTB) www.notesolution.com
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