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Notes on the internal hearing system
Typology: Lecture notes
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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