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Schizophrenia PET scan

The Striatum; part of the basal ganglia; neural pathways between the striatum and the frontal lobe have been implicated in planning function.

Cognitive planning is one of the executive functions, it encompases the neurological processes involved in the formulation, evaluation and selection of a sequence of thoughts and actions to achieve a desired goal. Various studies utilizing a combination of neuropsychological, neuropharmacological and functional neuroimaging approaches have suggested there is a positive relationship between impaired planning ability and damage to the frontal lobe.

A specific area within the mid-dorsolateral frontal cortex located in the frontal lobe has been implicated as playing an intrinsic role in both cognitive planning and associated executive traits such as working memory.

Disruption of the neural pathways, via various mechanisms such as traumatic brain injury, or the effects of neurodegenerative diseases between this area of the frontal cortex and the basal ganglia specifically the striatum (cortico-striatal pathway), may disrupt the processes required for normal planning function.[1]

Individuals who were born Very Low Birth Weight (<1500 grams) and Extremely Low BirthWeight (ELBW) are at greater risk for various cognitive deficits including planning ability.[2][3]

Neuropsychological TestsEdit

File:Tower of Hanoi 4.gif

There are a variety of neuropsychological tests which can be used to measure variance of planning ability between the subject and controls.

  • Tower of Hanoi (TOH-R), a puzzle invented in 1883 by the French mathematician Édouard Lucas. There are different variations of the puzzle, the classic version consists of three rods and usually seven to nine discs of subsequently smaller size. Planning is a key component of the problem solving skills necessary to achieve the objective, which is to move the entire stack to another rod, obeying the following rules:
    • Only one disk may be moved at a time.
    • Each move consists of taking the upper disk from one of the rods and sliding it onto another rod, on top of the other disks that may already be present on that rod.
    • No disk may be placed on top of a smaller disk.[4][5]
  • Tower of London (TOL) is another test that was developed in 1992 (Shallice 1992) specifically to detect deficits in planning as may occur with damage to the frontal lobe. test participants with damage to the left anterior frontal lobe demonstrated planning deficits (i.e., greater number of moves required for solution).

In test participants with damage to the right anterior, and left or right posterior areas of the frontal lobes showed no impairment. The results implicating the left anterior frontal lobes involvement in solving the TOL were supported in concomitant neuroimaging studies which also showed a reduction in regional cerebral blood flow to the left pre-frontal lobe. For the number of moves, a significant negative correlation was observed for the left prefrontal area: i.e. subjects that took more time planning their moves showed greater activation in the left prefrontal area.[6]

See alsoEdit


  1. Owen AM.Cognitive planning in humans: neuropsychological, neuroanatomical and neuropharmacological perspectives. Prog Neurobiol. 1997 Nov;53(4):431-50.PMID 9421831
  2. Harvey JM, O'Callaghan MJ, Mohay H. Executive function of children with extremely low birthweight: a case control study. Dev Med Child Neurol. 1999 May;41(5):292-7.PMID 10378753
  3. Aarnoudse-Moens CS, Weisglas-Kuperus N, van Goudoever JB, Oosterlaan J.Meta-analysis of neurobehavioral outcomes in very preterm and/or very low birth weight children. Pediatrics. 2009 Aug;124(2):717-28. Epub 27 July 2009. PMID 19651588
  4. Welsh MC, Huizinga M. The development and preliminary validation of the Tower of Hanoi-revised. Assessment. 2001 Jun;8(2):167-76.PMID 11428696
  5. Anderson JR, Albert MV, Fincham JM.Tracing problem solving in real time: fMRI analysis of the subject-paced Tower of Hanoi. J Cogn Neurosci. 2005 Aug;17(8):1261-74.PMID 16197682
  6. Shallice, T. (1982). Specific impairments of planning. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 298 (1089): 199–209.


Cognitive Planning: The Psychological Basis of Intelligent Behaviour by J P Das, Binod C Kar, Rauno K Parrila. Publisher: Sage Publications Pvt. Ltd; illustrated edition edition Language: English ISBN 0-8039-9287-4 ISBN 978-0-8039-9287-0

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