What does the place theory of pitch perception suggest? Differont amplitudes of the basilar membrane are sensitive to sounds of different waves: Receptors on different portions of the basilar membrane are sensitive to sounds of different frequencies Different portions of the ear are sensitive to sounds of ditferent decibels. Receptors on different sections of the malleus, incus, and stapes are sensitive to sounds of different frocuencies.
The Correct Answer and Explanation is:
Correct Answer:
Receptors on different portions of the basilar membrane are sensitive to sounds of different frequencies.
Explanation:
The place theory of pitch perception is a key concept in auditory neuroscience and psychology. It proposes that different parts of the cochlea’s basilar membrane respond to different frequencies of sound, allowing the brain to perceive pitch based on which region of the membrane is activated.
The basilar membrane is located within the cochlea of the inner ear. It varies in stiffness and width along its length. At the base of the cochlea, the membrane is narrow and stiff, making it more responsive to high-frequency sounds. Toward the apex (the top end), it becomes wider and more flexible, which makes it better suited for detecting low-frequency sounds.
When a sound wave enters the ear, it travels through the auditory canal, hits the eardrum, and is transmitted via the ossicles (malleus, incus, and stapes) into the cochlea. Inside the cochlea, the wave causes a specific region of the basilar membrane to vibrate, depending on the sound’s frequency. Hair cells located along this membrane convert the mechanical vibration into electrical signals, which are then sent to the brain via the auditory nerve. The brain interprets the location of the vibration along the basilar membrane as a specific pitch.
This theory is particularly effective in explaining how we perceive higher-frequency sounds, though lower-frequency sounds are better explained with the frequency theory, which focuses on the rate of nerve firing.
In summary, place theory helps explain how the auditory system distinguishes between various pitches based on the physical properties of the basilar membrane and its response to different sound frequencies, not decibels or ossicles.