Signal amplification and information

Benjamin Lindner

Description

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

Sujets

• Lindner
• Hearing

Informations

• Publié par: pefav
• Nombre de lectures: 25
• Langue: English
• Poids de l'ouvrage: 6 Mo

Extrait

0102 ,62 yraunaJ ,yadseuT  nedserD emetsyS rexelpmok  kisyhP rüf tutitsnI-kcnalP-xaM      puorg skpipm Benjamin Lindner Department of Biological Physics Stochastic Processes  in Biophysics transmission in neural systems Signal amplification and information

Tues Outline •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 -Summary day, January 26, 2010 0 0 0 0 12  emit . . . 1 item 2 3 3

PART 1 •HAIRBUNDLE DYNAMICS Tuesday, January 26, 2010

0102 ,62 yraunaJ ,yadseuT   ycneuqerf ni segnahc %1 < gniraeh ni ecnereffid elbitpecreP Difference of 6% Two neighboring piano keys Hearing range: 20Hz - 20kHz Range of frequencies and frequency resolution

Tue Range of s    ound amplitudes Wide dynamic range (6 orders of magnitude in sound pressure) s 0 dB sound pressure level (SPL) absolute hearing threshold for humans 9 !20 ! 10 % of the normal air pressure 120 dB sound pressure level (SPL) day, January 26, 2010 oLdur co krguop 3 !20 ! 10 % of the normal air pressure

Tuesday, January 26, 2010 www.vestibular.org

Tu Position 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