class+14+lecture+posted - Sensation and Perception Class...

Info icon This preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Sensation and Perception Class XIV: Auditory Scene Perception & Somatosensation
Image of page 1

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

View Full Document Right Arrow Icon
Sound Localization How do you locate a sound in space? Conceptually, this is a similar challenge to determining how far away a visual object is The solution is also similar: Compare the inputs to the two ears, which (like the two eyes) are in different places in space. Azimuth: The angle of a sound source on the horizon relative to a point in the center of the head between the ears Measured in degrees, with 0 degrees being straight ahead Angle increases clockwise, with 180 degrees being directly behind
Image of page 2
Figure 10.1 Position detection by the visual and auditory systems
Image of page 3

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

View Full Document Right Arrow Icon
Sound Localization Interaural time differences (ITD): The difference in time between a sound arriving at one ear versus the other
Image of page 4
Figure 10.3 Interaural time differences for sound sources varying in azimuth
Image of page 5

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

View Full Document Right Arrow Icon
Figure 10.4 Interaural time differences for different positions around the head
Image of page 6
Sound Localization Physiology of ITD Medial superior olive (MSO): A relay station in the brain stem where inputs from both ears contribute to detection of ITDs ITD detectors form connections from inputs coming from two ears during the first few months of life
Image of page 7

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

View Full Document Right Arrow Icon
Sound Localization Interaural level difference (ILD): The difference in level (intensity) between a sound arriving at one ear versus the other For frequencies greater than 1000 Hz, the head blocks some of the energy reaching the opposite ear ILD is largest at 90 degrees and –90 degrees; nonexistent for 0 degrees and 180 degrees ILD generally correlates with angle of sound source, but correlation is not quite as great as it is with ITDs
Image of page 8
Figure 10.2 Ears receive slightly different inputs when the sound source is located on different sides
Image of page 9

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

View Full Document Right Arrow Icon
Figure 10.6 Interaural level differences for tones of different frequencies presented at different positions (Part 1)
Image of page 10
Figure 10.6 Interaural level differences for tones of different frequencies presented at different positions (Part 2)
Image of page 11

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

View Full Document Right Arrow Icon
Sound Localization Physiology of ILDs:
Image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern