1-Consciousness-Sense-Hearing-Physiology-Frequency-Spectrum

audibility curve

At each audible frequency, people have an intensity threshold {audibility curve}.

equal loudness curve

At each audible frequency, specific sound-pressure levels (SPL) cause people to hear equal loudness {equal loudness curve}.

isointensity curve

At constant amplitude, auditory-neuron firing rate depends on frequency {isointensity curve}. For amplitude 20 dB at characteristic frequency, firing rate is 180 per second. For amplitude 20 dB at 500 Hz below or 500 Hz above characteristic frequency, firing rate is 50 per second. For amplitude 20 dB at 1300 Hz to 1400 Hz above characteristic frequency, auditory neurons have spontaneous firing rate.

threshold tuning curve

At each frequency, people have a sound-intensity threshold {threshold tuning curve}.

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Date Modified: 2022.0225