Tonotopic position determines the structure of hair bundles in the cochlea. The height of hair bundles increases from base to apex and the number of stereocilia decreases (i.e. hair cells located at the base of the cochlea contain more stereo cilia than those located at the apex).
What is tonotopic arrangement?
Tonotopic organization means that cells responsive to different frequencies are found in different places at each level of the central auditory system, and that there is a standard (logarithmic) relationship between this position and frequency. Each cell has a characteristic frequency (CF).
What does tonotopic map represent?
Tonotopic organization expresses gradients in the representation (maps) of sound properties. Such properties are frequency of tones, frequency ratios between harmonics and the pitch of complex sounds, speed and direction of frequency sweeps, sound intensity and location of sound in space.
What is the relationship between the basilar membrane and tonotopic organization?
What is the relationship between the basilar membrane and tonotopic organization? the basilar membrane is organized tonotopically – meaning each segment has a frequency of greatest sensitivity. essentially the 4 main tonotopic areas move from closest to the oval window (high frequency) to farthest away (low frequency).
Is the basilar membrane tonotopic?
As the frequency of the sound is lowered, the place of maximal amplitude of vibration shifts toward the cochlear apex. Because of this resonance gradient, the basilar membrane is said to be “tonotopically” organized.
Why is tonotopic organization important?
The experiments demonstrate that tonotopic representation is crucial to complex pitch perception and provide a new tool in the search for the neural basis of pitch.
What is tonotopic map in auditory cortex?
Tonotopic maps are a striking feature of the mammalian auditory cortex and underlie the representation of complex sounds, such as speech. This spatial separation of frequencies originates in the inner ear, where high frequencies are processed in the base of the cochlea and low frequencies in the apex.
Is basilar membrane tonotopic?
What is meant by a tonotopic map quizlet?
Tonotopic Map. An ordered map of frequencies created by the responding of neurons within structures in the auditory system.
Where is the tonotopic map?
auditory cortex
Tonotopic maps are a striking feature of the mammalian auditory cortex and underlie the representation of complex sounds, such as speech. This spatial separation of frequencies originates in the inner ear, where high frequencies are processed in the base of the cochlea and low frequencies in the apex.
Is a curve that indicates the sound pressure level at threshold for frequencies across the audible spectrum?
0-phon curve
The 0-phon curve represents the threshold of normal hearing. We can hear some sounds at intensity levels below 0 dB. For example, a 3-dB, 5000-Hz sound is audible, because it lies above the 0-phon curve. The loudness curves all have dips in them between about 2000 and 5000 Hz.
What is a Tonotopic map quizlet?
Tonotopic Map. An ordered map of frequencies created by the responding of neurons within structures in the auditory system. There is a tonotopic map of neurons along the length of the cochlea, with neurons at the apex responding best to low frequencies and neurons at the base responding best to high frequencies.
What is the structure of the basilar membrane?
Structure. The basilar membrane is widest (0.42–0.65 mm) and least stiff at the apex of the cochlea, and narrowest (0.08–0.16 mm) and most stiff at the base. High-frequency sounds localize near the base of the cochlea (near the round and oval windows), while low-frequency sounds localize near the apex.
What is the tonotopic organization of the cochlea?
It is this proper tonotopic organization of the hair cells in the cochlea that allows for correct perception of frequency as the proper pitch. In the cochlea, sound creates a traveling wave that moves from base to apex, increasing in amplitude as it moves along a tonotopic axis in the basilar membrane (BM).
Why does the basilar membrane present the first level of frequency analysis?
The basilar membrane (BM) presents the first level of frequency analysis in the cochlea because of its changing stiffness and nearly constant unit mass from base to apex. This forms a frequency-tuned delay line.
What is tonotopy in auditory system?
Tonotopy in the auditory system begins at the cochlea, the small snail-like structure in the inner ear that sends information about sound to the brain.
