Auditory_Localization_part_2_covered_in_class

Auditory_Localization_part_2_covered_in_class - Different...

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Different amounts of excitation and inhibition result in different graded potentials Resting potential Neuron threshold Here, the target neuron receives more excitation than inhibition. The graded potential is above threshold. The target neuron generates action potentials Resting potential Presynaptic neuron Target neuron Here, the inhibitory neurons send stronger signals, release more neurotransmitter, cause more hyperpolarization. The target neuron receives more inhibition than excitation. The graded potential is below threshold. The target neuron does not generate action potentials.
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IID Binaural neurons are “azimuth detectors. Fires most when IID is 20 17 12 0 (dBs) Fires most when the source 90o 60 o 30 o 0 o Each IID neuron responds most to a specific ratio of inhibition/excitation and thus responds most to sources from a specific azimuth. That azimuth is “its” azimuth. Strength of the excitatory input to the IID neuron. Strength of the inhibitory input to the IID neuron.
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Interaural intensity difference (IID) is a cue to azimuth IID Azim. 20dB 90 o 15dB 45 o 8dB 20 o To each azimuth (and each frequency) corresponds a specific IID. (See Slide 7.) Information about IID is coded in the rate of firing of IID binaural neurons. Specific IID binaural neurons respond most to each IID. The brain compares firing rates, “knows” which IID neurons are firing the most, and uses this information to infer IID the perceiver locates the sound at the corresponding azimuth. E.g., if the sound wave’s frequency is 10,000Hz, IID= 20dB for azimuth=90 o ; IID= 15dB for azimuth=45 o , etc. Brain infers Perceived sound location IID Binaural neurons’ firing rate
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(ITD) for long wave length sound waves The sound wave reaches both ears at the same time. ITD=0
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Auditory_Localization_part_2_covered_in_class - Different...

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