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. 2005 Aug 17;25(33):7575–7585. doi: 10.1523/JNEUROSCI.0915-05.2005

Figure 2.

Figure 2.

Stimulus construction. A, ITD/ILD stimulus set. Frozen noise was filtered through a cat HRTF, averaged over spatial location to give the location-independent spectral characteristics of the pinnae and ear canal. The noise was then copied into two streams, on which an ITD and an ILD were placed. B, SN/ILD stimulus set. The frozen noise was filtered through one of five HRTFs showing a prominent SN, split into two streams and attenuated relative to one another. C, ABI/ILD stimulus set. As in A, the frozen noise was filtered through the spatially averaged HRTF. It was then attenuated to one of five levels before being split into two streams that are attenuated relative to one another. The ILD was imposed such that the ABI was preserved. D, The five HRTFs used in the SN/ILD stimulus set. All were taken from the midline, at 0° azimuth. Note the prominent first SN, which shifts to higher frequencies as the elevation is increased. The SN/ILD stimulus set was resampled before presentation such that the notch for 15° elevation fell on the BF. avg, Average; attn, attenuation; contra, contralateral; ipsi, ipsilateral; DC, zero frequency.