Details

Autor(en) / Beteiligte

• Whitmer, William M.
• Dye, Raymond H.

Titel

The effect of frequency modulation of the ability to judge dynamic changes in interaural level differences

Ist Teil von

• The Journal of the Acoustical Society of America, 1999-10, Vol.106 (4_Supplement), p.2237-2238

Erscheinungsjahr

1999

Quelle

Scitation (American Institute of Physics)

Beschreibungen/Notizen

• The cues for apparent auditory motion include dynamic interaural temporal differences, level changes, and frequency modulation (FM) [Rosenblum, Perception 16, 175–186 (1987)]. The manner in which these cues interact was examined in a task in which listeners judged the point at which a stimulus having dynamic changes in interaural level difference (ILD) passed through the intracranial midline. In base-line conditions, stimuli were 2.0–2.5-s, 0.5- or 2-kHz sinusoids presented through headphones. In experimental conditions, a frequency-modulated tone was added. Frequency was modulated by a linear ramp or according to a Doppler-based algorithm. The midpoint of the frequency-sweep occurred either at the instant that the ILD passed through 0 dB, acting as a task cue, or at some other point. FM rate and magnitude, temporal position of frequency-sweep midpoint, and direction of apparent movement were randomized across trials. Results indicated that the presence of FM had a significant effect on the perception of intracranial midline. This effect was obtained across FM parameter values. Results were considered in terms of how dynamic cues for perceived motion perceptually interact. [Work supported by NIH and AFOSR.]