Regular Interval Sounds (RIS) | Department of Physiology, Development and Neuroscience

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Here are two examples of Regular Interval sounds (RIS) and a comparable noise, The RIS were constructed using a 16 ms delay and 8 iterations.

Noise
RIS with a fixed pitch
RIS that plays a melody

This figure shows the auditory images of RIS constructed in AIM, with the associated autocorrelograms.

Patterson, R. D., Uppenkamp, S., Johnsrude, I., and Griffiths, T. D. (2002). The processing of temporal pitch and melody information in auditory cortex, Neuron, 36, 767-776.

These brain images show the activity produced by RIS in auditory cortex.