Audition and Sound Processing

Front

What are sounds in terms of physics?

Back

Sounds are mechanical waves propagating through the air.

Front

How did the ear and balance organs evolve?

Back

The ear, together with balance organs, evolved from the lateral line in fish, which detects water waves.

Front

What is the relationship between sound intensity and decibels?

Back

Sound intensity is measured in decibels (dB) and is related to wave amplitude.

Front

What does sound tone depend on?

Back

Sound tone depends on frequency.

Front

What is the significance of the Organ of Corti?

Back

The Organ of Corti is responsible for sound sensing and contains hair cells.

Front

What is the difference between inner and outer hair cells?

Back

Inner hair cells are highly innervated and transduce signals, while outer hair cells have reduced innervation and are involved in signal modulation.

Front

What is endolymph and where is it found?

Back

Endolymph is contained in the scala media (membranous labyrinth) and is highly positively charged compared to perilymph.

Front

What is perilymph and where is it found?

Back

Perilymph is contained in the bony labyrinth and has a similar ionic composition to extracellular space.

Front

What is the role of the cochlear hair cells?

Back

Cochlear hair cells do not possess real cilia but have cytoplasmic prolongations called stereocilia.

Front

What is the main mechanism of sound signal transduction in mammals?

Back

The main mechanisms involve different cilia sizes, mechanical properties of the basilar membrane, and the action of outer hair cells.