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Signal amplification and information


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75 Pages


Signal amplification and information transmission in neural systems Stochastic Processes in Biophysics mpipks group Benjamin Lindner Department of Biological Physics Max-Planck-Institut für Physik komplexer Systeme Dresden Tuesday, January 26, 2010

  • hearing

  • enhanced signal

  • short-term plasticity

  • frequency-dependent info

  • analytical approach

  • max-planck institut für



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0102 ,62 yraunaJ ,yadseuT nedserD emetsyS rexelpmok kisyhP rüf tutitsnI-kcnalP-xaM     puorg skpipmBenjamin LindnerDepartment of Biological PhysicsStochastic Processes in Biophysicstransmission in neural systemsSignal amplification and information
TuesOutline•Dynamics of coupled hair bundles -enhanced signal amplification by means of coupling-induced noise reduction- Intro- Numerical simulation approach- Experimental approach- Analytical approach•Effects of short-term plasticity on neural information transfer- Intro- Broadband coding of information for    a simple rate-coded signal- different presynaptic populations:   frequency-dependent info transfer   by additional noise -Summaryday, January 26, 2010000012 emit...1item233
PART 1HAIRBUNDLE DYNAMICS Tuesday, January 26, 2010
0102 ,62 yraunaJ ,yadseuT  ycneuqerf ni segnahc %1 < gniraeh ni ecnereffid elbitpecrePDifference of 6%Two neighboring piano keys Hearing range: 20Hz - 20kHzRange of frequencies and frequency resolution
TueRange of s  ound amplitudesWide dynamic range (6 orders of magnitude in sound pressure)s0 dB sound pressure level (SPL)absolute hearing threshold for humans9!20!10% of the normal air pressure120 dB sound pressure level (SPL)day, January 26, 2010oLdur co krguop3!20!10% of the normal air pressure
Tuesday, January 26, 2010www.vestibular.org
TuPosition of maximum vibration depends on frequency“tonotopic mapping”http://www1.appstate.edu/~kms/classes/psy3203/Ear/Neurotransmitter causes action potentials that are sent to the brain esday, January 26, 2010