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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Psychoneuroendocrinology. 2011 May;36(4):547–556. doi: 10.1016/j.psyneuen.2010.08.009

Figure 1.

Figure 1

Comparative time-domain and spectrographic representations of the standard noise burst (panels A and C) and biologically salient yap (panels B and D) startle stimuli. It is evident that these are highly contrastive physical stimuli. The noise burst offsets precede the onsets of the energetic portion of the yaps. Yap onsets are relatively graded in comparison to noise bursts. Yaps are also harmonically complex (possess distinct formants), segment, and extend in time.