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Abstract
Frequency- and intensity-difference limens were measured in two passerine species, the red-wing blackbird (Agelaius Phoeniceus) and the brown-headed cowbird (Molothrus Ater). Operant conditioning techniques which we described previously were employed. The techniques made use of key pecks as observing and report responses. Birds were reenforced with food for reporting changes in frequency or intensity in an ongoing train of tone bursts. Smallest Weber fractions were obtained at 4 kHz where the mean JND was 30 Hz or Δf/f=0.0075. The mean value of Δf/f was 0.015 at 1 kHz and 0.02 at 8 kHz. Birds were more sensitive to upward frequency shifts than to downward shifts at 1 and 2 kHz. Mean intensity JND's were 2.5 dB for a 1-kHz tone at 50 dB SL and 5.4 dB for a 20-dB-SL tone. [This work was supported by a grant from NINCDS.]
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