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Perceptual and neuronal patterns of auditory distance processing in humans

Perceptual and neuronal patterns of auditory distance processing in humans. Norbert Kopčo and Jana E štočinová Perception and Cognition Laboratory P.J. Šafárik University in Košice , Slovakia. Workshop 28.5.2014 Košice, SLOVAKIA

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Perceptual and neuronal patterns of auditory distance processing in humans

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  1. Perceptual and neuronal patterns of auditory distance processing in humans Norbert Kopčo and Jana Eštočinová Perception and Cognition Laboratory P.J. Šafárik University in Košice, Slovakia Workshop 28.5.2014 Košice, SLOVAKIA Cognitive neuroscience of auditory and cross-modal perception

  2. The brain can “hear distance” Kopco et al., PNAS‘12

  3. Experimental design Distance discrimination task

  4. Behavioral results

  5. FMRI- adaptation

  6. Summary of Kopčo et al. (2012) Neuronal representation of distance in human auditory cortex based on intensity independent cues ILD & DRR= optimal cues to study intensity-independent distance processing Two questions: Are we really looking at distance area, or is it area encoding one of the acoustic cues ILD and DRR? Which cues did the subjects actually use? DRR or ILD?

  7. Acoustic analysis of the stimuli Two questions: Are we really looking at distance area, or is it area encoding one of the acoustic cues ILD and DRR? Which cues did the subjects actually use? DRR or ILD? DRR should dominate (Kopco et al 2011) and these data

  8. Current study: 3 behavioral experiments Exp 1: • Is DRR a stronger cue than ILD? • Does incongruent DRR-ILD stimulation cause a weaker distance percept than congruent presentation? I.e., is this a good stimulus for fMRI?

  9. Current study: 3 behavioral experiments Exp 1: • Is DRR a stronger cue than ILD? • Does incongruent DRR-ILD stimulation cause a weaker distance percept than congruent presentation? I.e., is this a good stimulus for fMRI? Exp 2: What happened in Exp 1??? Exp 3: What happened in Exp 2??? Exp 1: What happens if Exp 1 follows Exp 3???

  10. Results: Exp 1

  11. Results: Exp2 • Exp 1 Exp 2

  12. Results: Exp3

  13. Results: Exp1 after Exp 3 Experiment 1 done after Exp 3 Experiment 1 done first

  14. Summary • Distance cue weighting critically dependent on previous experience (Exp 1&3): • ILD weighted more if many conditions with consistent ILD included • DRR weighted more if conditions with DRR-only cue more frequent • DRR-based performance persists to performance on following days in the same virtual room • Perceived direction is not critical for DRR-based distance judgments (Exp 2): • Performance with diotic stimuli (perceived within the median plane) is better than performance for monaural stimulus (perceived in direction consistent with stimulus) • Incongruent stimulation weakens distance percept • We have good stimuli for fMRI

  15. Collaborators JyrkiAhveninen andAuditory Cognitive Neuroscience LabMartinos Center, MGH & HMS • This work is the result of the Project implementation: University Science Park TECHNICOM for Innovation Applications Supported by Knowledge Technology, ITMS: 26220220182, supported by the Research & Development Operational Programme funded by the ERDF. • [This contribution was supported by Slovak Research and Development Agency under grant project APVV-0452-12.] Acknowledgement

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