aud_present_b

aud_present_b - X.B.3. Neural mechanisms of calculating...

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Unformatted text preview: X.B.3. Neural mechanisms of calculating target distance FM-FM cells FM-FM Cells show selectivity for pulse-echo pairs X.B.3.a FM-FM cells show selectivity form pulse echo pairs so its not only pulse or only echo 120 90 60 quency(kHz) 30 Freq se cond) time time time Respons (Spikes/sec time time Pulse alone echo alone Pulse and echo Axis of responses time No response No response Big response M M cells sho selecti it form p lse echo pairs so it's not onl p lse or onl echo FM-FM cells show selectivity form pulse echo pairs so it's not only pulse or only echo What is it in the stimulus to which the cells are responding? Does the cell require all 8 components? FM-FM Cells selectivity is due solely to two FM components (example FM1-FM3 cell) X.B.3.b. FM-FM cells selectivity is due to only two FM components (example FM1-FM3 cell) Below is an example of an FM1-FM3 cell that only requires these two components (FM1 pulse and FM 3 echo). All other combos of pulse and echo components do not drive this cell. Some example of the many other combinations are shown in the first two columns FM3-FM4 (kHz) 120 FM1-CF2 FM1-FM3 Frequency( 90 60 30 esponse es/second) Re (Spike time time time Only responds when FM1 and FM3 are present with the correct delay What is it in the stimulus to which the cells are responding? FM-FM cells are sharply tuned for the delay between pulse and echo X.B.3.c. FM-FM cells are sharply tuned for the delay between pulse and echo 120 kHz) Delay= 7 ms Delay= 9 ms Delay= 5 ms Delay= 3 ms 90 60 30 Frequency(k ponse s/second) Resp (Spikes me me me me time time time time This cell is sharply tuned for a 7 ms delay FM-FM Cells are broadly tuned for Doppler shift 120 z) X.B.3.d. FM-FM cells are broadly tuned for Doppler shift 90 60 equency(kH 30 Fr esponse Re 120 Hz) 90 60 30 requency(kH Fr esponse time time time time Re This cell responds to a wide range of Doppler shift Target distance is topographically mapped. X.B.3.e. FM-FM cortical areas have maps of echo delay cortical area has a map of echo 6 ms 3 ms m) (2 m) FM1-FM3 M1 M4 A cortical area has a map of echo delay based on neurons that are tuned for the delay in the 12 ms (1 m) (4 m) FM1-FM4 M1- M2 returning echo (see below) 25 ms FM1 FM2 s X.B.4. Neural Mechanisms of calculating target velocity -- CF-CF neurons CF-CF neurons show selectivity form pulse echo pairs X.B.4.a. CF-CF neurons show selectivity form pulse echo pairs kHz) Pulse alone Echo alone Pulse + Echo 120 quency (k 60 90 Fre 30 ponse es/sec) Weak or no response Strong response Weak or no response Resp (spike Try every combination involving an FM component and dont get a response Three examples of such stimuli (taken from an earlier slide) are shown below) 120 (kHz) FM1-FM3 FM3-FM4 FM1-CF2 90 60 30 Frequency( time time time No Response No Response No Response CF-CF cells selectivity is due to only two CF components (example CF1-CF3 cell) X.B.4.b. CF-CF cells selectivity is due to only two CF components (for example CF1-CF3 cell)...
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This note was uploaded on 11/16/2011 for the course NPB NPB 100 taught by Professor Campbell during the Spring '10 term at UC Davis.

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aud_present_b - X.B.3. Neural mechanisms of calculating...

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