Auditory input is represented tonographically in auditory cortex (analogous to the topographical representation of visual cortex). What does this specifically mean in the case of audition?

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BlackTom AI · Accepted Answer

In this question, we’re asked to interpret what it means for auditory input to be tonographically represented in the auditory cortex.
Option 1 posits that the location of sound sources in the environment is directly mapped onto different cortical areas, creating a spatial representation of the auditory world. While there is a separate process for auditory spatial localization, tonotopy specifically refers to how sound frequency is represented, not the external position of sounds.
Option 2 claims that the volume (loudness) of sounds is mapped spatially across the auditory cortex, with quiet sounds anterior and loud sounds posterior. This is not how auditory cortex organization is described; brightness or loudness mapping is not the defining feature of tonotopy.
Option 3 states that different frequencies are represented in an orderly manner along the surface of the auditory cortex, with low frequencies at the anterior end and high frequencies at the posterior end. This aligns with the concept of tonotopic (frequency-based) organization, where neighboring neurons respond to nearby frequencies and the spatial arrangement mirrors the cochlear frequency map.
Option 4 suggests that the timing of auditory inputs is represented spatially, with simultaneous sounds activating adjacent areas of the cortex. Temporal aspects like timing and simultaneity are important in audition, but tonotopy specifically concerns the orderly spatial mapping of frequency, not the representation of timing per se.
In summary, the essence of tonotopic organization is a structured, frequency-based map across the auditory cortex, making Option 3 the accurate depiction of tonographic representation, while the other options describe different auditory processing concepts or misinterpret the nature of tonotopy.

PSC 135 001 SQ 2025 Lecture 12 Quiz: Auditory perception

Auditory input is represented tonographically in auditory cortex (analogous to the topographical representation of visual cortex). What does this specifically mean in the case of audition?

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