7b lies just rostral/lateral to 7a. Pandya and Selzer call it PF (maybe PFG).
“Somatosensory Spatial Planning???”
(Robinson and Burton, JCN 80a, 80b via Andersen’s handbook chapter): 80% cells shows a somatosensory response. A crude topography exists: head is medial near IPS, lower trunk and legs are lateral near S2. (also Hyvarinen 1981)
Matelli, Gallese, and Rizzolatti, 1984:“The effect of unilateral surgical ablations of lateral part of inferior parietal lobule (area 7b) has been studied in the macaque monkey. The following neurological deficits were found: 1) A hemi-inattention for tactile stimuli applied to the hemiface and hand contralateral to the lesion; 2) A hemi-inattention for visual stimuli in the contralateral peripersonal space; 3) A reluctance to use the contralateral arm; 4) A mild and transient deficit in mouth grasping movements towards stimuli contralaterally presented; 5) postural abnormalities of the hand contralateral to the lesion. It is proposed that area 7b is involved in the perception of the peripersonal space and in the organization of movements towards stimuli presented in that space.”
7b is connected to (all due to AAES):
Little visual input. AAES: “area 5 projects only to area 7b in the IPL, and this route probably represents one of the most direct pathways for somatosensory information to flow into the lobule.”