The acoustic startle stimulus was a 50-ms 105-dB(A) burst of white noise (20 Hz-20 kHz) with instantaneous rise- and fall-times, presented binaurally
through Sony MDR-P70 headphones, and generated by a custom-made noise acoustic stimulator from the facilities of the University of Murcia.
The results of this investigation clearly suggest that both the detection and identification of speech information presented binaurally
against a background of competing speech messages is significantly enhanced when the target phrase is located in the right hemifield.
The stimulus was a 100 Hz tone presented binaurally
though Sony DR-7 stereophonic headphones.
Stimuli were presented binaurally
through MR-compatible headphones with a sound absorption of 30 dBA (Resonance Technology).
In contrast, the effects of 3 to 5 months of symmetrical sound deprivation in rats that were binaurally
deprived of sound (through bilateral ligation at 10 days of age) showed that binaural interaction was essentially normal.
The acoustic startle probe consisted of a 50-ms 105-dB(A) burst of white noise (20Hz-20KHz) with instantaneous rise time, presented binaurally
through headphones, and generated by a custom-made noise stimulator from the facilities of the University of Murcia.
The spatial audio cues -- broadband (20-Hz to 10-kHz) noise bursts delivered at regular intervals until the participant responded -- were presented binaurally
through a set of USAF PRU-57 active noise reduction headphones and were generated so as to be perceived as emanating from varying positions in the horizontal plane (see Figure 1).
"Comite Consultatif International Telegraphique et Telephonique" (CCITT) speech noise was presented binaurally
by means of insert earphones (E-A-RTONE3A, Aero Company, USA).
All verbalizations were presented binaurally
at an intensity of 60 dB(A) at the participant's ear.
The NH participants listened to the stimuli binaurally
through a pair of headphones (AKG, K 271).
Auditory warning tones - pulsed pink noises with a cutoff frequency of 11 kHz - were presented binaurally
to participants via a set of Sennheiser HD 250 II Studio Monitor headphones.
For the stereo condition the frequency and duration values were the same as the standard (90 ms, 1kHz), but the signal was conveyed through both headphones binaurally