01:830:301 Lecture Notes - Lecture 17: Heptatonic Scale, Music Perception, Sensory Neuron
2 May 2016
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Document Summary
Restoration of complex sounds: listeners use higher-order source of info, not just auditory info, to restore missing segments, gaps in a sound stream are less detrimental if filled with noise rather than with silence. Octave- interval between 2 sounds frequencies with a ratio of 2:1. As you go up through a range of frequencies (to higher pitch heights), each doubling spans an octave. Octaves are then subdivided into recurring sequences of evenly spaced musical notes. Position on the helix is the pitch height and its tonal quality called its chroma. Classic western division is 7 notes an octave- heptatonic scale (doh-ray-me-fa-so-la- tee) Another scale is 5 notes- pentatonic scale- staples of blues, jazz, and rock music. Rhythm- pattern of timing in auditory sequences, including regular variation in emphasis. Some rhythm is external, but some is totally in you head- evenly spaced sounds are often heard as rhythmic when they are not.
