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. 2002 May 15;22(10):4241–4247. doi: 10.1523/JNEUROSCI.22-10-04241.2002

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Fig. 1. — Binaural 1 sec stimuli evoked the greatest efferent-induced changes in DPOAE levels. A, Binaural auditory stimulation at 5.6 kHz, L₁ =L₂ = 65 dB SPL, produced a larger decrement (filled circles) than did monaural stimulation (open circles). ISI, Interstimulus interval. B, The shaded region denotes differences between baseline monaural (open circles) and binaural efferent (filled circles) stimulation in the same animal shown in A for the frequency region from 2.8 to 11.3 kHz (L₁ =L₂ = 65 dB SPL) and points out the variation in efferent effects across frequencies. C, The formula used to determine the average efferent strength (E).