Psychology 2115A/B Lecture : Unit 2 Complete
19 Dec 2012
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Stimulus is movement of air molecules due to a vibration of a physical object. As the object vibrates, the molecules compress and spread out (rarifying) Sends out high pressure and low pressure type of stimulus; works towards ear to elicit an auditory response. Travels at a constant rate of speed; under water medium has the same results as in an air medium; waves travel faster in water. Sound waves: frequency: how many times they repeat themselves in a second. Measure in cps (cycles per second) or hz (hertz) Distance is regarded as a wave length from peak to peak. Direct trade off from length and its frequency. Less peak = greater distance between them (and vise versa) How much energy was put into the stimulus. Height of the sound wave (strength) : amplitude. Less pressure putting into creating the wave. Larger amplitude = louder sound: phase. Bel scale: measures how much oomph was put into that sound.
