PSYCH 3A03 Lecture Notes - Basilar Membrane, Arnold Tongue, Band-Pass Filter
5 Nov 2013
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Document Summary
Threshold tuning curves display the spl sound required to cause the neuron"s firing rate to go just above the cell"s spontaneous firing rate as a function of frequency. Range of tuning reflects dynamic range of neuron (see i/o function) how widely tuned, how much frequency information the cell passes through. Effective bandwidth (bw) of tuning curve increases with cf. Cells tuned to higher frequencies have higher frequency curves greater bandwidth. Bandwidth reflects how well it can encode from threshold to were it saturates (30-40db dynamic range in amplitude) Shape and width of neural tuning curve reflects bandpass filter properties (frequency selectivity) of mechanical tuning of basilar membrane. Spike (action potential) timing to frequencies <5khz is non-random (period of the stimulus is too short and we have entered the refractory period of the neuron) Spikes often occur at specific times (phases) of sinusoid stimulus. Such spikes are said to be phase locked because they follow certain phase of stimulus (following response)
