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Visual Adaptation And Spatial Auditory Processing

Visual Adaptation And Spatial Auditory Processing. Peter Lok ša, Norbert Kopčo Collaborators: Jenni Groh, Barb Shinn-Cunningham, I-Fan Lin. Way to go Red Sox!. Way to go Red Sox!. Introduction. Visual stimuli can affect the perception of sound location. e.g. the Ventriloquism Effect.

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Visual Adaptation And Spatial Auditory Processing

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  1. Visual Adaptation And Spatial Auditory Processing Peter Lokša, Norbert Kopčo Collaborators:Jenni Groh, Barb Shinn-Cunningham, I-Fan Lin

  2. Way to go • Red Sox! • Way to go • Red Sox! Introduction • Visual stimuli can affect the perception of sound location • e.g. the Ventriloquism Effect • e.g. the Ventriloquism Afterffect • But does effect persist? • But does effect persist? • - barn owls: prism adaptation (Knudsen et al.) • - monkeys: “ventriloquism aftereffect” (Woods and • Recanzone, Curr. Biol. 2004)

  3. What is reference frame • What is the • reference frame? • Eye-centered? • ? • ? • Oculomotor? • Head (ear) -centered?

  4. Methods • Basic idea: • 1. Pre-adaptation baseline: Measure auditory saccade accuracy • 2. Adaptation phase: Present combined visual-auditory stimuli, with visual location shifted • 3. Compare auditory saccade accuracy pre- and post-adaptation

  5. Expected behavior • Magnitude (°) • Stimulus Location (°) Method: center • Fix head to face 0° • Induce shift: • - in only one region of space • - from a single fixation point • Test to see if shift generalizes • to the same sub-region in: • - head-centered space • - eye-centered space • Experiment divided into • 1-hour blocks: • (12 for humans, 16 for monkeys) • Within a block, 3 types of • randomly interleaved trials: • - Training AV stim: 50% • - Test A-only stimuli: 50% (25% from trained, 25% shifted FP) • Audiovisual display • Speakers • LEDs • FP

  6. Follow-up • Are results independent of where ventriloquism is introduced? • - Spatial auditory resolution is lower in the periphery • - Maier et al. 2009 – binaural cue adaptation only in center • Eye-centered? • ? • ? • Oculomotor? • Head (ear) -centered?

  7. Method: periphery • Fix head to face 0° • Induce shift: • - in only one region of space • - from a single fixation point • Test to see if shift generalizes • to the same sub-region in: • - head-centered space • - eye-centered space • Experiment divided into • 1-hour blocks: • (12 for humans, 16 for monkeys) • Within a block, 3 types of • randomly interleaved trials: • - Training AV stim: 50% • - Test A-only stimuli: 50% (25% from trained, 25% shifted FP) • Expected behavior • Audiovisual display • Speakers • Magnitude (°) • LEDs • FP • Stimulus Location (°)

  8. Results: AV-shifted data

  9. Results: AV-aligned Baseline • Humnas: • Monkeys:

  10. Summary • The main results are consistent across species and regions: • it’s possible to locally introduce ventriloquism aftereffect • the reference frame is a mixture between head- and eye-centered • But • Visual stimuli influence saccade responses to auditory stimuli even when the AV-stimuli are spatially aligned: • Expanding the auditory spatial map outside the trained area • In an head-centered way when AV training is in center • In a way that is modulated by eye-centered representation when AV training is in periphery

  11. Collaborators • Jenni Groh, Duke University • I-Fan Lin, NTT Tokio • Barb Shinn-Cunningham, BU

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