Dataset for "Amplitude- and latency-growth functions of human electrocochleographic and brainstem responses"

This dataset supports the findings outlined in Temboury-Gutierrez, M., Megyik, O., Encina-Llamas, G., and Dau, T. (<b>2025</b>). "Amplitude- and latency-growth functions of human electrocochleographic and brainstem responses." The Journal of the Acoustical Society of America, 158, 4512–4524. https://doi.org/10.1121/10.0041759The dataset contains normative data for 20 young test participants with normal hearing thresholds.<br>The Readme file provides a description of the dataset's content and the related article. The data collected were:<br>Population data: age, gender, tested ear, and head width and lengthAudiogramsAuditory evoked potentials (AEP)Population DataDataset providing population information for the 20 participants (<code>tp</code>) tested in the study. The data summarizes the participants' <code>age</code>, <code>gender</code>, tested ear (<code>ear</code>), and their head <code>width</code> (measured ear-to-ear, in the frontal plane) and head <code>length</code> (measured from the glabella to the external occipital protuberance, in the median plane) in cm.AudiogramAudiometric thresholds (<code>thresh</code>) were collected for 20 participants (t<code>p</code>), at frequencies (<code>freq</code>) of 0.125, 0.25, 0.5, 1, 2, 4, 8, 10, 12.5, 14, and 16 kHz. The thresholds are given in dB Hearing Level (HL).Auditory Evoked Potentials (AEP)Click- and LS CE chirp-evoked (Kristensen and Elberling, 2012) compound action potentials (CAP) and auditory brainstem responses (ABR) were recorded for 20 participants (<code>tp</code>) at 8 stimulus intensities (10 to 80 dB nHL in 10-dB steps). Stimulus calibration followed RETSPL values of 35.5 dB (click) and 31.5 dB (chirp) (Gøtsche-Rasmussen <i>et al</i>., 2012). CAPs were measured using a differential montage from the <b>eardrum to ipsilateral mastoid</b>, and ABRs from <b>vertex to ipsilateral mastoid</b>.The file <code>evoked_data.npz</code> contains:<code>fs</code> — Sampling frequency (in Hz), used for all waveforms.<code>time_vector</code> — Time vector (in ms) for waveforms.Response Measures (all arrays are shaped <code>(20, 8)</code>, where axis 0 is participant, axis 1 is intensity):<code>amp_chirp_cap</code> — Peak-to-trough amplitudes for chirp CAP.<code>amp_chirp_abr</code> — Peak-to-trough amplitudes for chirp ABR.<code>amp_click_cap</code> — Peak-to-trough amplitudes for click CAP.<code>amp_click_abr</code> — Peak-to-trough amplitudes for click ABR.<code>peak_lat_chirp_cap</code> — Latencies (in ms) of N₁ peak for chirp CAP.<code>peak_lat_chirp_abr</code> — Latencies of wave-V peak for chirp ABR.<code>peak_lat_click_cap</code> — Latencies of N₁ peak for click CAP.<code>peak_lat_click_abr</code> — Latencies of wave-V peak for click ABR.<code>trough_lat_chirp_cap</code> — Latencies (in ms) of subsequent trough (P₁) for chirp CAP.<code>trough_lat_chirp_abr</code> — Latencies of wave-V trough for chirp ABR.<code>trough_lat_click_cap</code> — Latencies of P₁ for click CAP.<code>trough_lat_click_abr</code> — Latencies of wave-V trough for click ABR.Averaged Waveforms:Each waveform is a 2D array of shape <code>(20, n_time)</code>, where <code>n_time</code> corresponds to the number of samples in the time vector (<code>time_vector</code>):<code>waveform_chirp_cap</code> — Averaged chirp CAP waveforms.<code>waveform_chirp_abr</code> — Averaged chirp ABR waveforms.<code>waveform_click_cap</code> — Averaged click CAP waveforms.<code>waveform_click_abr</code> — Averaged click ABR waveforms.<b>Note</b>: Intensities are ordered from 10 to 80 dB nHL across axis 1 of all latency and amplitude arrays. All waveforms were baseline-corrected and averaged across trials and resampled to 10 kHz before being saved. The amplitudes and latencies were obtained from the waveforms prior to resampling (fs=16384 Hz).Ethical statementAll listeners were financially compensated for their time and gave written informed consent. Ethical approval for the study was provided by the Science-Ethics Committee for the Capital Region of Denmark (reference H-16036391).AcknowledgmentsThe authors thank the Interacoustics Research Unit (IRU) for kindly providing the waveforms for the LS CE chirp stimuli.ReferencesKristensen, S. G. B., and Elberling, C. (2012). “Auditory brainstem responses to level-specific chirps in normal-hearing adults,” J Am Acad Audiol, 23, 712–721. doi:10.3766/jaaa.23.9.5<br>Gotsche-Rasmussen, K., Poulsen, T., and Elberling, C. (2012). “Reference hearing threshold levels for chirp signals delivered by an ER-3A insert earphone,” Int J Audiol, 51, 794–799. doi:10.3109/14992027.2012.705901<br>