AS localising sound Flashcards
What is the primary function of the auditory system?
Identify and process complex sounds
This includes forming a full spatial map and locating sound sources in space.
What are the two known mechanisms for localizing sound?
- Interaural time difference
- Interaural intensity difference
Other mechanisms may also exist.
Which nucleus computes sound arrival at the two ears?
Medial Superior Olive
It determines the interaural time difference by processing signals from both ears.
What is the role of the Lateral Superior Olive (LSO)?
Locates sound sources by comparing inputs from both ears
It integrates excitatory and inhibitory signals to determine sound location.
Fill in the blank: The delay in arrival of a sound wave at one ear relative to the next is known as _______.
Interaural time difference
What does tonotopic organization refer to in the auditory system?
Matching across frequency bands
This allows for different frequencies to be processed in distinct areas.
True or False: The inferior colliculus is involved in sound feature processing.
True
What is the principal relay to the cortex in the auditory system?
Medial Geniculate Cortex
What type of synaptic transmission occurs at the Calyx of Held?
Reliable synaptic transmission
This ensures fast and reliable communication between neurons even at high input frequencies.
What is the function of the Acoustic Stria in the auditory pathway?
- Dorsal
- Intermediate
- Ventral
These structures play roles in processing and relaying auditory information.
Fill in the blank: The _______ is responsible for processing interaural level difference.
Lateral Superior Olive
What is the role of the Dorsal Cochlear Nucleus?
Processes complex sounds
It is one of the primary nuclei involved in auditory processing.
How does the LSO determine sound location?
By integrating excitatory inputs from the ipsilateral ear and inhibitory inputs from the contralateral ear
The balance between these signals determines the net excitation.
What is the significance of delay lines in the auditory system?
They act as coincidence detectors for sound localization
They are accurate up to 10 ms.
What anatomical structures are involved in the auditory pathway for localizing sound?
- Cochlea
- Auditory Nerve
- Dorsal Cochlear Nucleus
- Antero Ventral Cochlear Nucleus
- Postero Ventral Cochlear Nucleus
- Medial Superior Olive
- Lateral Superior Olive
- Lateral Lemniscus
- Inferior Colliculus
- Medial Geniculate Cortex
