Direction detection depends on head size

• Time delay is a function of head width

  • Human = 0.5 msec
  • Mouse (1 cm head width) = 0.03 msec
  • Smaller animals canít do this

• Phase difference is maximum when wavelength = 2 x distance between the ears

  • Mouse could respond to 12-20 kHz
  • Humans could respond to 1 kHz

• Diffraction effect is greatest with wavelengths 2-5x head width

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