Intraparietal sulcus
| Brain: Intraparietal sulcus | ||
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| Lateral surface of left cerebral hemisphere, viewed from the side. (Intraparietal sulcus visible at upper right, running horizontally.) | ||
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| Principal fissures and lobes of the cerebrum viewed laterally. (Fissures not labeled, but parietal lobe is colored yellow.) | ||
| Latin | sulcus intraparietalis | |
| Gray's | subject #189 822 | |
| Part of | Parietal lobe | |
| Acronym(s) | IPS | |
| NeuroNames | hier-79 | |
| NeuroLex ID | birnlex_4031 | |
The intraparietal sulcus (IPS) is located on the lateral surface of the parietal lobe, and consists of an oblique and a horizontal portion. The IPS contains a series of functionally distinct subregions that have been intensively investigated using both single cell neurophysiology in primates[1][2] and human functional neuroimaging.[3] Its principal functions are related to perceptual-motor coordination (for directing eye movements and reaching) and visual attention.
The IPS is also thought to play a role in other functions, including processing symbolic numerical information,[4] visuospatial working memory [5] and interpreting the intent of others.[6]
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[edit] The IPS role in numerical cognition
Behavioral studies suggest that the IPS is associated with impairments of basic numerical magnitude processing and that there is a pattern of structural and functional alternations in the IPS and in the PFC in dyscalculia.[7] Children with developmental dyscalculia were found to have less gray matter in the left IPS.[8]
[edit] Other roles of the IPS
Five regions of the intraparietal sulcus (IPS): anterior, lateral, ventral, caudal, and medial
- LIP & VIP: involved in visual attention and saccadic eye movements
- VIP & MIP: visual control of reaching and pointing
- AIP: visual control of grasping and manipulating hand movements
- CIP: perception of depth from stereopsis
All of these areas have projections to the frontal lobe for executive control.
[edit] Additional images
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Lateral surface of left cerebral hemisphere, viewed from above.
[edit] References
- ^ Colby C.E., Goldberg M.E. (1999). "Space and attention in parietal cortex". Annual Review of Neuroscience 22: 319–349. doi:10.1146/annurev.neuro.22.1.319. PMID 10202542.
- ^ Andersen R.A. (1989). "Visual and eye movement functions of the posterior parietal cortex". Annual Review of Neuroscience 12: 377–403. doi:10.1146/annurev.ne.12.030189.002113. PMID 2648954.
- ^ Culham, J.C.; Nancy G. Kanwisher (April 2001). "Neuroimaging of cognitive functions in human parietal cortex". Current Opinion in Neurobiology 11 (2): 157–163. doi:10.1016/S0959-4388(00)00191-4.
- ^ Cantlon J, Brannon E, Carter E, Pelphrey K (2006). "Functional imaging of numerical processing in adults and 4-y-old children.". PLoS Biol 4 (5): e125. doi:10.1371/journal.pbio.0040125. PMC 1431577. PMID 16594732. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1431577. link
- ^ Todd JJ, Marois R (2004). "Capacity limit of visual short-term memory in human posterior parietal cortex". Nature 428 (6984): 751–754. doi:10.1038/nature02466. PMID 15085133.
- ^ Grafton, Hamilton (2006). "Dartmouth Study Finds How The Brain Interprets The Intent Of Others.". Science Daily. http://www.sciencedaily.com/releases/2006/02/060216191651.htm.
- ^ Ansari D., Karmiloff-Smith A. (2002). "Atypical trajectories of numver development: a neuroconstructivist perspective". Trends in Cognitive Science 6 (12): 511–516. doi:10.1016/S1364-6613(02)02040-5. PMID 12475711.
- ^ Kucian K. et al. (2006). "Impaired neural networks for approximate calculation in dyscalculic children: a functional MRI study". Behavior and Brain Function 2: 31. doi:10.1186/1744-9081-2-31. PMC 1574332. PMID 16953876. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1574332.
[edit] External links
- Illustrations at ssc.uwo.ca
- intraparietal+sulcus at eMedicine Dictionary
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