Auditory Cortex — Function, Location & Quiz
Primary auditory cortex is tucked into Heschl’s gyrus inside the lateral sulcus, so it is easy to point to the exposed superior temporal surface and miss the actual primary field. Its tonotopic map organizes sound frequency before auditory information separates into identity and location streams.
One-sided cortical injury rarely produces complete deafness because auditory pathways have bilateral representation. The more revealing deficits are difficulty localizing sound or recognizing what a heard sound means, while bilateral injury is required for cortical deafness.
Test this anatomy in the Brain Regions Quiz: 15 Questions With Answers or explore it on the interactive 3D brain.
Where is the Auditory Cortex located?
Sound processing, pitch discrimination, auditory perception.
What does the Auditory Cortex do?
- Processing sound frequency, intensity, timing
- Tonotopic organization — frequency map like a piano keyboard
- Sound localization (binaural cues)
- Speech sound discrimination
Auditory Cortex pathways and connections
- MGN (medial geniculate nucleus of thalamus) → A1
- A1 → Auditory 'what' stream (ventral, temporal — sound identity)
- A1 → Auditory 'where' stream (dorsal, parietal — sound location)
What happens when the Auditory Cortex is damaged?
- Bilateral lesion → cortical deafness (rare — need both sides damaged)
- Unilateral lesion → difficulty localizing sound, subtle deficits
- Auditory agnosia — can hear but can't recognize sounds or music (amusia)
Auditory Cortex key facts
Atlas category: cortical. Brodmann areas or landmark: BA 41, 42 (primary auditory — Heschl's gyrus).
- Heschl's gyrus is buried in the lateral sulcus — not visible from outside
- Tonotopic: low frequencies lateral, high frequencies medial
- Planum temporale (behind Heschl's) is larger on the left — asymmetry linked to language lateralization
Auditory Cortex exam tip
A1 is in Heschl's gyrus (hidden in the Sylvian fissure). Don't confuse with superior temporal gyrus (Wernicke's).
Common questions
Where is the primary auditory cortex?
It lies in Heschl’s transverse temporal gyrus, buried within the lateral sulcus. It corresponds mainly to Brodmann areas 41 and 42.
What is tonotopic organization?
Tonotopy is an ordered cortical map of sound frequency, with neighbouring neurons responding best to neighbouring frequencies, comparable to arranging notes along a keyboard.
Does one auditory cortex lesion cause deafness?
Usually not. A unilateral lesion causes subtler deficits such as impaired sound localization, while bilateral cortical damage is generally needed for cortical deafness.
When does the Auditory Cortex light up?
- 🎵 When you get goosebumps from music: The auditory cortex decodes the music's melody, harmony, and rhythm.
- 👂 When you hear your name in a crowd: Your auditory cortex processes the acoustic signal, separating your name from background noise.
- 📱 When you get a notification on your phone: The auditory cortex registers the notification chime, even before you consciously notice it.
- 🎵 When you listen to music: The auditory cortex decodes pitch, melody, and harmony from incoming sound.
- 💃 When you dance: Your auditory cortex breaks the music into rhythm, timing, and pitch.
- ⏰ When you wake up to an alarm: The auditory cortex picks up the alarm's sharp tones.
- ⏰ When you hit snooze: Your auditory cortex decodes the blaring alarm as a sound you need to respond to.
- 🧠 When you learn a new language: The auditory cortex breaks down unfamiliar phonemes into acoustic patterns.