Introduction Research Methods Fall 2010 Tamás Bőhm.

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Presentation transcript:

Introduction Research Methods Fall 2010 Tamás Bőhm

What is psychophysics? Subdiscipline of experimental psychology Measuring the relationship between physical stimuli and their subjective correlates (percepts) Physical dimensions: light intensity, sound intensity, sound frequency etc. Subjective/perceptual dimensions: brightness, loudness, pitch, etc. Psychophysics: usually refers to vision Psychoacoustics: hearing

Why do we need psychophysics? Physical dimensions ≠ perceptual dimensions Light intensity ≠ brightness

Why do we need psychophysics? Physical dimensions ≠ perceptual dimensions –If you double the intensity of a tone, you won’t hear it twice as loud! (only 60% louder) –If you change the frequency of a tone, loudness will also change (loudness depends both on intensity and on frequency) Sound intensity ≠ loudness

Why do we need psychophysics? Physical dimensions ≠ perceptual dimensions

Some practical uses Absolute threshold of hearing

Some practical uses Aging and the absolute threshold of hearing Wikipedia

Some practical uses Hearing aids: compensating for audibility loss by measuring individual audibility curves pure-tone audiometry Fletcher, 1929

Some practical uses Mp3 music coding: 1:10 compression by applying results from psychoacoustics –Absolute and difference thresholds –Properties of binaural hearing (joint stereo) –Masking effects

Some practical uses Military camouflage: detectability of patterns (different shapes and colors) from different viewing distances, under different conditions