Click-evoked auditory brainstem response thresholds are most closely correlated with behavioral thresholds for which frequency range?

Click-evoked auditory brainstem response thresholds are most closely correlated with behavioral thresholds for which frequency range?

• A. 1000 Hz only
• B. 250-500 Hz
• C. 500-1000 Hz
• D. 2000-4000 Hz

Answer: (D)

Click-evoked ABR thresholds mirror the part of the cochlea that contributes most reliably to the onset response. A brief click stimulates a broad range of frequencies, but the early ABR waves are dominated by synchronous neural firing from the basal portion of the cochlea, which corresponds to the higher-frequency region around 2–4 kHz. Because of this, the ABR threshold to a click provides the best estimate of behavioral hearing in that mid-to-high frequency range. At frequencies well below this range (like 250–500 Hz or 500–1000 Hz), the ABR’s onset response is less robust and less tightly tied to behavioral thresholds, so the correlation is poorer. Therefore, the closest match to behavioral thresholds when using a click is the 2000–4000 Hz range.

Click-evoked ABR thresholds mirror the part of the cochlea that contributes most reliably to the onset response. A brief click stimulates a broad range of frequencies, but the early ABR waves are dominated by synchronous neural firing from the basal portion of the cochlea, which corresponds to the higher-frequency region around 2–4 kHz. Because of this, the ABR threshold to a click provides the best estimate of behavioral hearing in that mid-to-high frequency range. At frequencies well below this range (like 250–500 Hz or 500–1000 Hz), the ABR’s onset response is less robust and less tightly tied to behavioral thresholds, so the correlation is poorer. Therefore, the closest match to behavioral thresholds when using a click is the 2000–4000 Hz range.