A4

Stream:
Classical equivalent:
Mapped to Glasser: ???

MNI Coordinates

• Right:
• Left:
• Source: (Paper, Jahr)

Anatomical location

• A4 may correspond to cytoarchitectonic area Te3 (Morosan et al., 2005).
• supero-medial border with PBelt (Glasser et al. (2016) - Nature)
• inferior neighbour A5 (Glasser et al. (2016) - Nature)
• medial neighbour TA2 (Glasser et al. (2016) - Nature)

Function(s)

• A4 vs A5: differs in functional connectivity (this gradient defined the boundary) (Glasser et al. (2016) - Nature)
• more myelin than A5 (statistically), but myelin peak ≠ FC peak location (Glasser et al. (2016) - Nature)
• A4 vs TA2: more myelin + different FC (Glasser et al. (2016) - Nature)
  • A4 is more activated in LANGUAGE MATH and STORY contrasts (Glasser et al. (2016) - Nature)
  • A4 is less activated in CUE-AVG (Glasser et al. (2016) - Nature)

Connectivity

• differs in FC to A5
• effective connectivity to MT and MST (Rolls et al. (2023) - Cerebral Cortex)
  • which connect to superior parietal regions forming a Auditory Where-Stream (Dorsal) involved in actions in space. (Rolls et al. (2023) - Cerebral Cortex)
• functional connectivity (FC) between A4, PBelt, 7AL, 8Am, 7PC (Rolls et al. (2023) - Cerebral Cortex)
  • auditory inputs to Auditory Where-Stream (Dorsal) (Rolls et al. (2023) - Cerebral Cortex)
  • maybe more shifting visual attention and eye position (Rolls et al. (2023) - Cerebral Cortex)

Projections

• to BA44, 44 (Rolls et al. (2023) - Cerebral Cortex)

PFC targets

Summary

see also

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• Tags: neuroscience science brainregion

Superlink: 050 🧠Neuroscience
Created: 2025-11-13 15:52