The Isolation of Numerals at the Semantic Level

Thioux, Marc; Pillon, Agnesa; Samson, Dana; Courtray, Marie-Pierre de Partz de; Noël, Marie-Pascale; Serón, Xavier

doi:10.1080/13554799808410633

Cited by 60 publications

(12 citation statements)

References 51 publications

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“…This allows us to exclude category size as a cause of MMV's selective deficit with numbers. These results are similar to those obtained by other individuals (Thioux et al, 1998;Domahs et al, 2006). Finally, we might consider whether it is number words per se that are affected or any words that refer to quantity-words such as many, few, enough, etc.…”

Section: The Special Status Of Numbers?supporting

confidence: 85%

“…Other categories of words within this set would be highly automatised sequences such as the letters of the alphabet, days of the week, months of the year. In fact the individuals described by Cohen et al (1997), Bachoud-Levi et al (2003), Cipolotti et al (1991), and Thioux, Pillon, Samson, De Partz, Noel & Seron (1998) had poor performance with words from ordered sequences as well as with numerals (letters, days of week, names of month). However, MMV was able to repeat days of the week and months of the year without making the lexical errors he made in number word repetition (Table 2) and his auditory comprehension of words from these categories (as assessed by auditory-written word matching was close to perfect; 95% for days of week and 98% for months).…”

Section: The Special Status Of Numbers?mentioning

confidence: 93%

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Deafness for the meanings of number words

et al. 2008

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We describe the performance of an aphasic individual who showed a selective impairment affecting his comprehension of auditorily presented number words and not other word categories. His difficulty in number word comprehension was restricted to the auditory modality, given that with visual stimuli (written words, Arabic numerals and pictures) his comprehension of number and non-number words was intact. While there have been previous reports of selective difficulty or sparing of number words at the semantic and post-semantic levels, this is the first reported case of a pre-semantic deficit that is specific to the category of number words. This constitutes evidence that lexical semantic distinctions are respected by modality-specific neural mechanisms responsible for providing access to the meanings of words.

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Section: The Special Status Of Numbers?supporting

confidence: 85%

Section: The Special Status Of Numbers?mentioning

confidence: 93%

Deafness for the meanings of number words

et al. 2008

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“…Naming difficulty is reported in clinical series (Grossman et al, 2004;Kompoliti et al, 1998) and in autopsy-proven cases of CBD (Kertesz, Hudson, Mackenzie, & Munoz, 1994;Murray et al, in press;Wenning, Litvan, & Jankovic, 1998), but comprehension single words appears to be relatively preserved (Grossman et al, submitted;Kertesz, Hudson, Mackenzie, & Munoz, 1994;Sakurai, Hashida, & Uesugi, 1996). Moreover, several case studies of brain-damaged patients dissociate language and calculation (Rossor, Warrington, & Cipolotti, 1995;Thioux et al, 1998). The CBD patients examined in the present study are not aphasic.…”

Section: Discussionmentioning

confidence: 48%

Too much to count on: Impaired very small numbers in corticobasal degeneration

Halpern

Clark

Moore

et al. 2007

Brain and Cognition

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Patients with corticobasal degeneration (CBD) have calculation impairments. This study examined whether impaired number knowledge depends on verbal mediation. We focused particularly on knowledge of very small numbers, where there is a precise relationship between a cardinality and its number concept, but little hypothesized role for verbal mediation. We evaluated accuracy and reaction time (RT) for matching dot arrays and Arabic numerals involving smaller (2-4) and larger (5-9) cardinalities in non-aphasic patients with CBD (n=16), frontotemporal dementia (FTD; n=23), and healthy controls (n=15). CBD were less accurate and slowed at judging smaller Arabic numeraldot array stimuli compared to FTD patients and controls. Moreover, only CBD showed longer RTs judging successively larger number-dot array pairs among the smaller cardinalities. Difficulty judging very small numbers is impaired in CBD, suggesting degraded representation of precise number knowledge that does not depend on language functioning.

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“…Several single-case studies indicate that numbers doubly dissociate from other categories of words at the semantic level. On the one hand, spared calculation and number comprehension abilities have been described in patients with grossly deteriorated semantic processing (Thioux, Pillon, Samson, De Partz, Noel, & Seron, 1998) or semantic dementia ). In both cases, the lesions broadly affected the left temporo-frontal cortices while sparing the intraparietal regions.…”

Section: Neuropsychological Evidencementioning

confidence: 99%

Three Parietal Circuits for Number Processing

Dehaene

Piazza

Pinel

et al. 2003

Cognitive Neuropsychology

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208

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Did evolution endow the human brain with a predisposition to represent and acquire knowledge about numbers? Although the parietal lobe has been suggested as a potential substrate for a domain-specific representation of quantities, it is also engaged in verbal, spatial, and attentional functions that may contribute to calculation. To clarify the organisation of number-related processes in the parietal lobe, we examine the three-dimensional intersection of fMRI activations during various numerical tasks, and also review the corresponding neuropsychological evidence. On this basis, we propose a tentative tripartite organisation. The horizontal segment of the intraparietal sulcus (HIPS) appears as a plausible candidate for domain specificity: It is systematically activated whenever numbers are manipulated, independently of number notation, and with increasing activation as the task puts greater emphasis on quantity processing. Depending on task demands, we speculate that this core quantity system, analogous to an internal "number line," can be supplemented by two other circuits. A left angular gyrus area, in connection with other left-hemispheric perisylvian areas, supports the manipulation of numbers in verbal form. Finally, a bilateral posterior superior parietal system supports attentional orientation on the mental number line, just like on any other spatial dimension.

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The Isolation of Numerals at the Semantic Level

Cited by 60 publications

References 51 publications

Deafness for the meanings of number words

Deafness for the meanings of number words

Too much to count on: Impaired very small numbers in corticobasal degeneration

Three Parietal Circuits for Number Processing

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