Mental number line disruption in a right-neglect patient after a left-hemisphere stroke

Pia, Lorenzo; Corazzini, Luca Latini; Folegatti, Alessia; Gindri, Patrizia; Cauda, Franco

doi:10.1016/j.bandc.2008.05.007

Cited by 37 publications

(29 citation statements)

References 42 publications

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“…Blind individuals consistently showed a leftward bias in bisecting numerical intervals, with the magnitude of the leftward bias being comparable to that reported in a matched group of blindfolded sighted participants (Experiment 2). Notably, in both blind and sighted participants, the directional bias was constant (i.e., to the left), regardless of the order (ascending or descending) in which the numerical pairs were presented (see Loftus et al, 2009;Longo & Lourenco, 2007;Pia et al, 2009). …”

Section: Discussionmentioning

confidence: 99%

“…In fact, whereas the order of presentation of the numbers seems not to affect the direction of the bisection bias (Doricchi, Guariglia, Gasparini, & Tomaiuolo, 2005;Longo & Lourenco, 2007;Pia et al, 2009), presenting numbers in ascending versus descending order may modulate the magnitude of the bisection bias, with the leftward bias being larger for numbers presented in descending order (see Loftus et al, 2009;Longo & Lourenco, 2007). To verify whether this is also the case for blind individuals, we carried out a second experiment in which a group of blind participants underwent the same task as in Experiment 1, but with numerical pairs presented in both ascending and descending order.…”

Section: Methodsmentioning

confidence: 97%

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Blind individuals show pseudoneglect in bisecting numerical intervals

Cattaneo

Fantino

Silvanto³

et al. 2011

Atten Percept Psychophys

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Blind individuals show pseudoneglect in bisecting numerical intervals

Cattaneo

Fantino

Silvanto³

et al. 2011

Atten Percept Psychophys

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“…In the absence of such measures it is impossible to evaluate the validity and generality of the working memory and mental number line account. For instance, studies by Pia et al (2009) and by Cocchini et al (2006) recently reported left hemisphere lesion patients displaying a pattern of performance that is not the same as that of GG. As these studies did not report working memory performance it is hard to judge the theoretical impact of their results.…”

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confidence: 99%

Non-spatial neglect for the mental number line

et al. 2011

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A c c e p t e d M a n u s c r i p t A within-subject double dissociation between physical and number-space neglect is described This double dissociation extended to ordinal sequences and was non-spatial in natureThe number-space neglect was associated with a position-based deficit in working memory Pointers towards a new theory for the relation between numbers and space are discussed *Research HighlightsPage 2 of 58 A c c e p t e d M a n u s c r i p t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 Non-Spatial Neglect for the Mental Number LineIn 1880 Galton published two papers in which he described people who report vivid spatial experiences when processing numbers, forming what he called "natural lines of thought" (Galton, 1880a(Galton, , 1880b. This observation supported the intuitive idea that the processing of number and space are tightly linked. It is only in the last two decades, however, that the relation between numbers and space has become the subject of systematic investigation and now, about 100 years after Galton"s classical observation, it is widely accepted that the processing of numbers is intimately related to the processing of spatial information at both functional and anatomical levels (e.g. Dehaene, Piazza, Pinel, & Cohen, 2003;Fias & Fischer, 2005;Hubbard, Piazza, Pinel, & Dehaene, 2005; Umilta, Priftis, & Zorzi, 2007).One of the most convincing and robust phenomena that demonstrate the interaction between numbers and space is the SNARC-effect. When asked to indicate whether a number is odd or even with a left or right key press, participants tend to react faster to relatively small numbers (e.g. 1) with their left hand than with their right hand side, while they are faster to relatively large numbers (e.g. 9) when the responses are executed with the right hand side. Dehaene et al. (1993) called this finding the spatial-numerical association of response codes (SNARC) effect and postulated that it was attributable to the mental organization of numbers, taking the form of a horizontally oriented mental number line (MNL) with small numbers located on the left and large numbers on the right. Since then, this effect has been replicated in a wide variety of experimental tasks, for example, magnitude comparison (Brysbaert, 1995) or phoneme monitoring (Fias, Brysbaert, Geypens, & d'Ydewalle, 1996), for a re...

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“…For example, patients with hemi-neglect following brain damage show biases when asked to 'bisect' numerical intervals analogous to those shown when they bisect physical lines (Zorzi et al, 2002;Pia, Corazzini, Folegatti, Gindri, & Cauda, 2009;Priftis, Zorzi, Meneghello, Marenzi, & Umiltà, 2006; but, for an alternate view, see Doricchi, Guariglia, Gasparini, & Tomaiuolo, 2005;van Dijck, Gevers, Lafosse, Doricchi, & Fias, 2011). Similarly, neurologically healthy adults show small leftward biases ('pseudoneglect') when bisecting physical lines and underestimation when bisecting numerical intervals, consistent with the left-to-right organization of the mental number line (Göbel et al, 2006;Longo & Lourenco, 2007a;Loftus et al, 2009).…”

Section: Bisecting Approaching Numbersmentioning

confidence: 85%

Approaching stimuli bias attention in numerical space

2012

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Increasing evidence suggests that common mechanisms underlie the direction of attention in physical space and numerical space, along the mental number line. The small leftward bias (pseudoneglect) found on paper-and-pencil line bisection is also observed when participants 'bisect' number pairs, estimating (without calculating) the number midway between two others. Here we investigated the effect of stimulus motion on attention in numerical space. A two-frame apparent motion paradigm manipulating stimulus size was used to produce the impression that pairs of numbers were approaching (size increase from first to second frame), receding (size decrease), or not moving (no size change). The magnitude of pseudoneglect increased for approaching numbers, even when the final stimulus size was held constant. This result is consistent with previous findings that pseudoneglect in numerical space (as in physical space) increases as stimuli are brought closer to the participant. It also suggests that the perception of stimulus motion modulates attention over the mental number line and provides further support for a connection between the neural representations of physical space and number.

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Mental number line disruption in a right-neglect patient after a left-hemisphere stroke

Cited by 37 publications

References 42 publications

Blind individuals show pseudoneglect in bisecting numerical intervals

Blind individuals show pseudoneglect in bisecting numerical intervals

Non-spatial neglect for the mental number line

Approaching stimuli bias attention in numerical space

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