For frequencies less than 2400 Hz, frequency detection depends on cooperation between neuron groups firing in phase {volley theory} {volley code}. For frequencies less than 800 Hz, auditory-neuron subsets fire every cycle. For frequencies above 800 Hz and less than 1600 Hz, auditory-neuron subsets fire every other cycle. For frequencies above 1600 Hz and less than 2400 Hz, auditory-neuron subsets fire every third cycle {volley principle}. For example, three neurons firing at 600 Hz every third cycle can represent frequency of 1800 Hz.
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Date Modified: 2022.0224