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Walsh,2003A theory of magnitude

Mikael Skagenholt
be used in the sensorimotor transformations that are the main goal of these areas of cortex [5,6].
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 20-21 | Added on Sunday, March 10, 2013 12:59:19 PM
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I argue that the arrangement of the inferior parietal cortex reflects the common need for space, time and quantity information to
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 19-19 | Added on Sunday, March 10, 2013 12:59:15 PM
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This position addresses the question of why the parietal cortex, of paramount importance here, should contain subregions that are important for reaching, grasping, space, quantity and time.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 16-18 | Added on Sunday, March 10, 2013 12:58:53 PM
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That number can be represented spatially is, of course, well accepted and forms a basis for research into spatial aspects of numerical processing. Links between number and time or between space and time, on the other hand, are rarely discussed and the shared properties of all three systems have not been considered. I propose here that time, space and quantity are part of a generalized magnitude system. I outline A Theory Of Magnitude (ATOM) as a conceptually new framework within which to re-interpret the cortical processing of these elements of the environment.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 4-8 | Added on Sunday, March 10, 2013 12:58:03 PM
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Correspondingly, experiments in which responses are made to two or more magnitudes on successive trials should show cross-domain, withinmagnitude priming.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 183-184 | Added on Sunday, March 10, 2013 1:24:00 PM
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It is also important to extend ATOM to considerations of how the parietal cortex interacts with other structures involved in temporal processing, particularly the cerebellum and the prefrontal cortex
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 184-185 | Added on Sunday, March 10, 2013 1:23:36 PM
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Some strong predictions can be made from ATOM: the SNARC effect (spatial numerical association of response codes), in which small number judgments are associated with response codes in left space and large numbers with response codes in right space, should prove to be a SQUARC effect (spatial quantity association of response codes) in which any spatially or action-coded magnitude will yield a relationship between magnitude and space.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 180-183 | Added on Sunday, March 10, 2013 1:23:11 PM
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Does the spatial numerical association of response codes generalize to other magnitudes?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 175-176 | Added on Sunday, March 10, 2013 1:22:24 PM
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Are there interference or priming effects between the magnitudes?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 175-175 | Added on Sunday, March 10, 2013 1:22:21 PM
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Have we underestimated the co-occurrence of magnitude deficits in patients with damage to the brain areas involved in magnitude processing?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 174-175 | Added on Sunday, March 10, 2013 1:22:15 PM
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Is there a perception?action distinction for time as there is for space?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 173-174 | Added on Sunday, March 10, 2013 1:22:09 PM
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How do the key brain areas (PFC, PPC, basal ganglia, cerebellum) implicated in time, space and quantity processing interact?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 172-173 | Added on Sunday, March 10, 2013 1:21:54 PM
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Questions for Future Research
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 171-172 | Added on Sunday, March 10, 2013 1:21:49 PM
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How do an infant?s perception and behaviour of the time, space and quantity interact?
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 172-172 | Added on Sunday, March 10, 2013 1:21:45 PM
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In terms of ATOM, I want to suggest that attention is unlikely to add to the study of common mechanisms of magnitude and that some studies in which attention has been invoked as a post-hoc explanation of temporal processing may be reinterpreted with regard to common magnitude components in the tasks used.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 155-157 | Added on Sunday, March 10, 2013 1:21:07 PM
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If one considers standard behavioural timing models, so far attention has been attributed to all possible levels of the temporal process: at the level of the pacemaker [12], the switch between the pacemaker and accumulator [49], the accumulator [50], the store or comparator and the planned time of movements [30]. Correspondingly, temporal attention mechanisms have been located in every brain region that has been associated with attention in general: the right and left parietal cortex [16,30], the right and left dorsolateral prefrontal cortex [51], the cingulate cortex [51] and the visual cortex [52].
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 157-163 | Added on Sunday, March 10, 2013 1:20:42 PM
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The case for ATOM so far is based on the view that the main function, or at least the linking function, of the many capacities of the parietal cortex is the need to encode information about the magnitudes in the external world that are used in action. In other words, the parietal cortex transformations that are often assumed to compute ?where? in space, really answer the questions ?how far, how fast, how much, how long and how many? with respect to action. This view marks a departure from the view that the linking function of the parietal cortex is attention. Attention has too many incarnations, and explanations based on it too many degrees of freedom to be addressed in full here. However, it is worth looking at how attention has been used in at least one magnitude domain to illustrate its inadequacies.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 149-155 | Added on Sunday, March 10, 2013 1:19:28 PM
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I cannot address in this article the interactions between the anterior and posterior magnitude systems but, as the number sense is built upon the magnitude system, and the magnitude representation appears to have a spatial basis, it is important to consider the extent to which the actionbased magnitude system influences or even determines some features of the anterior system.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 140-143 | Added on Sunday, March 10, 2013 1:17:32 PM
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temporal information in
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 128-128 | Added on Sunday, March 10, 2013 1:16:18 PM
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these regions may be coded in neurons with multiplex properties and/or in cell assemblies with overlapping connections in the same region?.
Walsh,2003A theory of magnitude - Mikael Skagenholt - Your Highlight Location 128-129 | Added on Sunday, March 10, 2013 1:16:13 PM
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