Recordings from neurons selective for short and long intervals Neuron A – selective for short intervals Neuron B – selective for long intervals
Models of long-interval selectivity Edwards et al (2008) Model A – Each pulse produces an EPSP followed by an IPSP. IPSP and EPSP from following pulse overlap at fast rates (short intervals). Model B – There is depression of excitation at fast pulse repetition rates.
Human speech also has periodic AM flatounet.net
Principles of Auditory Cortex –Tonotopy, columnar organization of cells with similar binaural interaction –Unilateral lesion in auditory cortex: No deficit in understanding speech. But, Localization deficit. –Lesion in striate cortex: Complete blindness in one visual hemifield –Different frequency band information: Parallel processing e.g. frequency-specific localization deficit assoc. with small lesion. Neuronal Response Properties –Frequency tuning: Similar characteristic frequency –Isofrequency bands: Similar characteristic frequency, diversity among cells –Multiple computational maps- Bat auditory cortex. Auditory Cortex