AUDITORY SCENE ANALYSISPsychology 3041/6014 Spring, 2019AUDITORY SCENE ANALYSISFundamental Question: What is out there, and where is it?1. Auditory Scene Analysisa) Auditory system used to analyze, or parse the scene, or world around us2. Auditory Scenea) Sum of all auditory events, all sound sources (note, focus is on the sound-producing events, not the sounds)3. Auditory Streamsa) The sounds that denote a single, continuous sound-producing event4. Stream Segregationa) Top-downi. Automatic schema activationii. Voluntary schema activation1 of 3Psychology 3041/6014 Spring, 2019b) Bottom-up: primitive auditory scene analysisi. Use acoustic regularities to “calculate” likely stream segregationsii. GESTALT principles describe some segregation processes (strategies??)iii. Unrelated sounds seldom start/stop at the same time 1. Common fate2. Good continuation- “Old plus new”- “Tone through noise”iv. Gradualness of change1. Single sounds change slowly and smoothly2. Sequences of sounds from the same source change slowly3. Note: Takes some time (~4 sec) to build up evidence for a streamv. Harmonic relatedness2 of 3Psychology 3041/6014 Spring, 2019vi. Holistic effects1. Co-modulation masking release (CMR)5. Streaming and Gestalt Principles (Summary)GESTALT Principle Stream Effect or ExampleProximity (Nearness) Frequency, time or space proximitySimilarity Harmonic relatednessConnectedness Pitch glides pass through noiseGood continuation Gradual increase in loudness of approaching trainCommon fate Musical counterpointSymmetry Rising pitches tend to fall againClosure Masking, CMR3 of
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