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Magnitude systems

Mikael Skagenholt
Moreover, we documented a striking asymmetrical interaction between numbers and time processing, such that time can either be modulated by numerical magnitude in control participants and in patient CB, or it can be dramaticallyimpaired by the mere presentation of numerical stimuli in JT. Our data can be explained by the hypothesis of a partly shared magnitude system between magnitude dimensions, and endorse the proposal that asymmetries between number, time and space may relate to intrinsic, paradigm-free differences between these dimensions, with number being the strongest.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 588-592 | Added on Saturday, March 9, 2013 7:18:36 PM
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However, parietal lesions can often result in space impairment (see Rorden et al., 2006), therefore more cases need to be examined before reaching firm conclusions on the role of the parietal lobes in space processing
Magnitude systems - Mikael Skagenholt - Your Highlight Location 587-588 | Added on Saturday, March 9, 2013 7:18:00 PM
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Space processing was spared in our two patients.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 586-587 | Added on Saturday, March 9, 2013 7:17:51 PM
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The locus of the magnitude system shared among number, time and space processing has been originally proposed in the right inferior parietal cortex (e.g. Walsh, 2003). However, the selectively impaired numerical and temporal processing shown here, together with preserved space processing in both patients are difficult to accommodate within this proposal.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 568-571 | Added on Saturday, March 9, 2013 7:15:58 PM
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Finally, the idea that time is a vulnerable dimension found support in JT?s performance in temporal tasks showing that her temporal processing was destroyed by numerical stimuli even when they were task-irrelevant. Notably, such impairment did not emerge in case of space, again reinforcing the proposal that magnitude dimensions differ intrinsically, with time but not space or number being a weak dimension.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 565-568 | Added on Saturday, March 9, 2013 7:15:34 PM
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Whether numbers are a more salient dimension also relative to space remains to be established as our paradigms only explored the effect of numerical magnitude on length but not the opposite.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 556-557 | Added on Saturday, March 9, 2013 7:14:37 PM
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we suggest that asymmetric relations between magnitude dimensions are due to intrinsic differences between these dimensions, with numbers thought to be a more salient dimension or more automatically accessed relative to time.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 555-556 | Added on Saturday, March 9, 2013 7:14:28 PM
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we have shown that the asymmetry in the interaction occurred between dimensions whose representation is considered abstract, namely numbers and time, rather than between ?abstract? and more ?concrete? concepts such as space. We have also shown that numbers interacted with space
Magnitude systems - Mikael Skagenholt - Your Highlight Location 551-553 | Added on Saturday, March 9, 2013 7:13:47 PM
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However, we showed that the same interaction of number on time occurred in very different paradigms requiring temporal estimation and discrimination respectively.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 543-544 | Added on Saturday, March 9, 2013 7:10:44 PM
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This suggests that both symbolic and non-symbolic number stimuli seem to modulate time processing.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 539-540 | Added on Saturday, March 9, 2013 7:09:12 PM
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These asymmetries between dimensions are not in line with the original proposals of a fully shared mechanism, which predicts that time and numbers would only interact symmetrically
Magnitude systems - Mikael Skagenholt - Your Highlight Location 532-533 | Added on Saturday, March 9, 2013 7:07:37 PM
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Our data suggest that the relation between dimensions is asymmetrical, with numbers appearing as the most dominant dimension and time the weakest.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 528-529 | Added on Saturday, March 9, 2013 7:07:18 PM
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A partly shared mechanism would account for interactions as well as dissociations among dimensions, which can be explained by dimension-specific processes being impaired rather than the common magnitude system.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 526-527 | Added on Saturday, March 9, 2013 7:06:52 PM
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Instead, we suggest that our results are best explained by the proposal of a magnitude system partly shared among dimensions. This is the idea that besides sharing an approximate magnitude system number, time and space are also implemented by dimension-specific processes
Magnitude systems - Mikael Skagenholt - Your Highlight Location 523-525 | Added on Saturday, March 9, 2013 7:06:34 PM
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Our results indicate that: (i) number processing was impaired in JT but not in CB; (ii) in JT time processing was preserved unless numbers were part of the experimental paradigm even as taskirrelevant stimuli; (iii) in CB selectively impaired time processing was nevertheless modulated by numerical value, similar to controls; and that (iv) space processing was preserved in both patients.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 516-518 | Added on Saturday, March 9, 2013 7:06:08 PM
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Despite this impairment, CB?s temporal estimation and discrimination were influenced by the magnitude of the numerical stimuli, similar to control participants: small numerical stimuli or small numerical primes resulted in a significantly more underestimation of temporal durations relative to larger numerical stimuli or larger numerical primes. Contrasting with his time impairment, CB?s number and space processing were spared. He was accurate at estimating the numerosity of sets of stimuli, regardless as to whether these consisted of coloured circles or of numbers. Spatial processing was also entirely preserved, as CB was accurate at indicating the longer of two lines irrespective of the prime used.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 496-501 | Added on Saturday, March 9, 2013 7:04:53 PM
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In contrast, CB with a right hemisphere lesion was selectively impaired in processing time whereas number and space processing were preserved. His time impairment affected the ability to estimate temporal intervals as well as the ability to discriminate between temporal durations. For instance, CB?s underestimation of temporal intervals could be up to 1/3 of their veridical duration (e.g. 18 s for a veridical 60 s interval) and he was equally impaired irrespective of the stimuli displayed, i.e. coloured circles or Arabic numbers.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 493-496 | Added on Saturday, March 9, 2013 7:04:31 PM
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JT was equally accurate at discriminating the length of two line stimuli whether they were preceded by task-irrelevant numerical primes or by a non-numerical prime.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 491-492 | Added on Saturday, March 9, 2013 7:04:05 PM
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Strikingly, the same temporal interval was correctly judged as lasting approximately 1 min when coloured circles were displayed. Similarly, JT could correctly discriminate which of two line stimuli lasted longer in the presence of task-irrelevant symbols or letter primes, but she performed at chance when the identical stimuli were preceded by numerical primes.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 488-490 | Added on Saturday, March 9, 2013 7:03:41 PM
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Our results indicated that JT with a left parietal lesion was selectively impaired in processing numbers as indicated by the lack of the classical distance effect when comparing Arabic numerals, by her poor performance in arithmetic tasks and in numerosity estimation. Time processing was entirely accurate unless it was tested in the context of numbers even if these were taskirrelevant.
Magnitude systems - Mikael Skagenholt - Your Highlight Location 484-487 | Added on Saturday, March 9, 2013 7:03:12 PM
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