Neuroscience Animations

John H. Krantz, Hanover College,

Using the Media






Skin Senses

Statistical Concepts

Hanover College
Psychology Department


  • Processing frequency
    • Ohm's Acoustical Law.  Experience how our auditory system can hear individual frequencies out of a complex tone.
    • Fourier Analysis in Audition.  Illustration of how Fourier Analysis can break down a complex waveform into the individual frequencies.
    • The Decibel Scale.  Get a sense of the perceptual significance of the decibel scale by hearing sequences of tones differing by different numbers of decibels.
  • The encoding of frequency
    • The Place Theory.  See how different frequencies impact the travelling wave which forms the basis of place theory.
    • Frequency Theory.  See how the frequency of a stimulus is related to the firing rate of a single neuron which forms the basis of frequency theory.
    • Volley Principle.  Illustration of how having multiple neurons allows the encoding of higher frequency tones in Frequency Theory.
  • Masking
    • Tone Masking.  Examine what it takes for one tone at one frequency to block the perception of a tone at another frequency.  this is called Tone Masking.  It turns out that it is easier to for a tone of a lower frequency to mask a tone of a higher frequency than in the opposite situation.
    • The Ear and Tone Masking.  See an illustration of how tone masking works by viewing the impact of two tones on the motion of the basilar membrane in the cochlea.

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