Efferent effects extend 0.5-2 octaves around the probe frequency.

Evidence

The tuning of the efferent effect can extend 0.5–2 octaves above and below the frequency range of interest (spontaneous OAEs) or probe frequency (stimulus-frequency OAEs), as measured using simultaneous ipsilateral/contralateral tones (Lilaonitkul and Guinan 2009 ; Zhao and Dhar 2012 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953

The tuning of the efferent effect can extend 0.5–2 octaves above and below the frequency range of interest (spontaneous OAEs) or probe frequency (stimulus-frequency OAEs), as measured using simultaneous ipsilateral/contralateral tones (Lilaonitkul and Guinan 2009 ; Zhao and Dhar 2012 ). In most cases the tone/narrowband noise eliciting the efferent effect has maximal effect above a presentation level of 60 dB SPL, and in some cases the efferent effect has been shown to be more pronounced if the elicitor/precursor sound is about 0.5–1 octave below the probe frequency (e.g., Mott et al. 1989 ; Harrison and Burns 1993 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5979

Categorization

• corroborated: 2 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953; Dijk, Pim van, Physiology, Psychoacoustics and…, 5979