Lecture_11_16

Lecture_11_16 - X.B.3.e. FM-FM cortical areas have maps of...

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Target distance is topographically mapped. A cortical area has a map of echo delay based on neurons that are tuned for the delay in the returning echo (see below) 25 ms 12 ms 6 ms 3 ms X.B.3.e. FM-FM cortical areas – have maps of echo delay (1 m) (4 m) (2 m) FM1-FM3 FM1-FM4 FM1-FM2
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X.B.4. Neural Mechanisms of calculating target velocity -- CF-CF neurons
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CF-CF neurons show selectivity form pulse echo pairs Frequency (kHz) Response (spikes/sec) Pulse alone Echo alone Pulse + Echo Weak or no response Strong response Weak or no response 30 60 90 120 X.B.4.a. CF-CF neurons show selectivity form pulse echo pairs
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120 90 60 30 Frequency(kHz) time time FM1-FM3 FM3-FM4 FM1-CF2 time Try every combination involving an FM component and don’t get a response Three examples of such stimuli (taken from an earlier slide) are shown below) No Response No Response No Response
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CF-CF cells selectivity is due to only two CF components (example CF1-CF3 cell) Only CF2 pulse and CF 3 echo Only CF3 pulse and CF 4 echo No response No response Remove pulse 1 and echo 3 No response Only CF1 pulse and CF 3 echo Big response frequency response X.B.4.b. CF-CF cells selectivity is due to only two CF components (for example CF1-CF3 cell)
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120 90 60 30 Frequency(kHz) Response 120 90 60 30 time time time time CF-CF -neurons are tuned sharply for Doppler shift X.B.4.c. CF-CF -neurons are tuned sharply for Doppler shift
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CF-CF cells are broadly tuned for delay 120 90 60 30 Frequency(kHz) Response (Spikes/second) time time time time Delay= 7 ms Delay= 9 ms Delay= 5 ms Delay= 3 ms At delay =15 maybe no response At delay = -7 maybe no response X.B.4.d. CF-CF cells are broadly tuned for delay
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There is a map of velocity by combinations of frequencies in CF-CF maps of several cortical areas in mustached bats 88 kHz 89 kHz 90 kHz 91 kHz 29 kHz 30 kHz 31 kHz X.B.4.e. CF-CF cortical areas have maps for Doppler shift by double tonotopic axis
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X.C. Sound localization in barn owls X.C.1. Cues
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There are several different kinds of information the brain can use to compute a map of auditory space. Two important cues
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This note was uploaded on 11/22/2009 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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Lecture_11_16 - X.B.3.e. FM-FM cortical areas have maps of...

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