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Biology of Hearing Systems, Lecture notes of Biology

Notes on the internal hearing system

Typology: Lecture notes

2018/2019

Uploaded on 09/15/2023

carol-rojas-18
carol-rojas-18 🇺🇸

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Dorsal pathway
Ipsialter: What
Ventral Pathway: (first to superior olive, then IC) “Where”
Ipsilaterla and contralalteral
Afferent fibers
Most pass through inferior colliulus (IC)
Main locus of afferent convergence
Integrates what and where auditory cures
Uniedied sound percept
9:48 next slide
Mammal-rat diagram
Anatomy of cat-next slide
IC - firs stop nuclue of lateral lemniscus, via the fiber tracts
Cyan line
Superior olivary complex
Some form cochlear nucleus go straight to the interfrior collicul
Ventral stream
Grey-inhibtory
White-exchitatory
DNLL-Dorsal nucleus
Ipsilaterla right side
Contralaterla-left side
CI integrates sneoryt o creat auditory percepts
Medial middle
Lateral side
Outsdide two regions
-ICDC:dorsal cortex
-ICX: external nucleus/external cortex
70% are binaural: allow you to create maps
DCIC-monoaural from contralateral
Sound onsets: sharp responses in the voice
Stimulus epcific adaptation: if sound is repeated multiple times,
PSTH-ton ebusrt, neurotransmitter adaptation, adaptation adapts in short term response
Here happens in tens of seconds
ICC
Easier to get to, getting an elextorde, easier to just keep going
Intrinsic neurons: neurons native to the structure,
Discshaped cell, large and well defined orientation
pf3
pf4

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Dorsal pathway ● Ipsialter: What Ventral Pathway: (first to superior olive, then IC) “Where” ● Ipsilaterla and contralalteral Afferent fibers ● Most pass through inferior colliulus (IC) ● Main locus of afferent convergence ● Integrates what and where auditory cures ● Uniedied sound percept 9:48 next slide

Mammal-rat diagram Anatomy of cat-next slide

IC - firs stop nuclue of lateral lemniscus, via the fiber tracts Cyan line ● Superior olivary complex ● Some form cochlear nucleus go straight to the interfrior collicul Ventral stream

Grey-inhibtory White-exchitatory DNLL-Dorsal nucleus Ipsilaterla right side Contralaterla-left side

CI integrates sneoryt o creat auditory percepts Medial middle Lateral side Outsdide two regions -ICDC:dorsal cortex -ICX: external nucleus/external cortex

70% are binaural: allow you to create maps

DCIC-monoaural from contralateral ● Sound onsets: sharp responses in the voice ● Stimulus epcific adaptation: if sound is repeated multiple times, PSTH-ton ebusrt, neurotransmitter adaptation, adaptation adapts in short term response ● Here happens in tens of seconds ICC ● Easier to get to, getting an elextorde, easier to just keep going ● Intrinsic neurons: neurons native to the structure, ● Discshaped cell, large and well defined orientation

● Can take inputs form other neurons, stacked within each straiton ● Each disc represents a neuron ● Gets input form LSO LOSc and DCN ● Integration from many different regions bc of large area ● ● Stellate: orthogonal orientation (90 degrees) ○ Across these cells ALl kinds of responses bc of inputs from so many regions ● Chopper go up and down ● Chopper onset, initial is chopper and then primary adaptive, little spontaneous activity that gets suppressed ● Pauser no chop: initial response spiking, pause, ● Onset choppdf Same CF different kinds of tuning fork ● Both have CF around 8kHz Tonptopic ● Each line is a iso frequency band laminae ● Each layer is imialrly tuned ● Electrode, all neurons are tuned to same frequency ● Dorsal to ventral; low to high frequency ● As you go down, they bend backwards ● Faster change in frequency towards the back ● In order to maintain information in a different channel, ● Discrete jumps in CF going tdorsal to ventral ● 200 microns ● Corresponds to the thickness of the band ○ Layer of cake ● Thicker more towards the middle Q value: ● Tonotpy as a function fo space ○ Quantificaition of how wide it is Varied responses; ● Complex inhibtiona nd excitation

MT-minimum threshold - spectral receptive field: one single rneuron ● Lowest sound level to evoke a response ● Grey region: reduce the spiking within the neuron ○ Outside fo tuning curve ■ Reduced activity of spontaneous activity Game: grey region exitatory SRF ● Tuning curve is just the edge ● Darker grey area: the more excitatory ● Stripes(inhibitory ● (grey aea where red) - increased spiking