Dissociating estimation from comparison and response eliminates parietal involvement in sequential numerosity perception

Cavdaroglu, Seda; Katz, Curren; Knops, André

doi:10.1016/j.neuroimage.2015.04.019

Cited by 38 publications

(50 citation statements)

References 70 publications

(132 reference statements)

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“…Congruently with previous studies using delayed comparison tasks (Cavdaroglu and Knops, 2018;Cavdaroglu et al, 2015) we observed that match trials, during which a comparison was made, elicited stronger signals in intraparietal areas with respect to sample trials. Once again, our analysis methods allowed us to more precisely pin down the location of these activations within the IPS than done previously, and compare it to the ones observed during mere perception.…”

Section: Discussionsupporting

confidence: 88%

Mapping numerical perception and operations in relation to functional and anatomical landmarks of human parietal cortex

Castaldi

Vignaud

Eger

2019

Preprint

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Human functional imaging has identified the middle part of the intraparietal sulcus (IPS) as an important brain substrate for different types of numerical tasks. This area is often equated with the macaque ventral intraparietal area (VIP) where neuronal selectivity for non-symbolic numbers is found. However, the low spatial resolution and whole-brain averaging analysis performed in most fMRI studies limit the extent to which an exact correspondence of activation in different numerical tasks with specific sub-regions of the IPS can be established.Here we disentangled the functional neuroanatomy of numerical perception and operations (comparison and calculation) by acquiring high-resolution 7T fMRI data in a group of human adults, and relating the activations in different numerical contrasts to anatomical and functional landmarks on the cortical surface. Our results reveal a functional heterogeneity within human intraparietal cortex where the visual field map representations in superior/medial parts of IPS and superior parietal gyrus are involved predominantly in numerosity perception, whereas numerical operations predominantly recruit lateral/inferior parts of IPS. Since calculation and comparison-related activity fell mainly outside the field map representations considered the functional equivalent of the monkey VIP/LIP complex, the areas most activated during such numerical operations in humans are likely different from VIP.

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Section: Discussionsupporting

confidence: 88%

Mapping numerical perception and operations in relation to functional and anatomical landmarks of human parietal cortex

Castaldi

Vignaud

Eger

2019

Preprint

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“…When sighted participants listened to sequences of tones, the numerosity of the tones could be decoded from spatial patterns of activity within the IPS. This finding replicates the results of one previous fMRI study, which found that activity patterns in the IPS can be used to discriminate between auditory sequences of different quantities (Cavdaroglu et al, 2015).…”

Section: Representations Of Number In the Ips Are Modality Independentsupporting

confidence: 91%

“…As in previous work, we found that numerosity could also be decoded from activity patterns in primary auditory cortex, A1 (Cavdaroglu et al, 2015). However, relative to the IPS, decoding in A1 was more influenced by low-level properties of the stimuli (i.e., overall amount of sound).…”

Section: Representations Of Number In the Ips Are Modality Independentsupporting

confidence: 83%

“…In humans, repeated presentations of visual sets of the same quantity causes neural adaptation in the IPS with ratio-dependent recovery in activity following deviant quantities (Piazza, Pinel, Bihan, Dehaene, & Cedex, 2004;Piazza et al, 2007). Furthermore, numerical magnitudes elicit different spatial patterns of activity in the IPS (Bluthe, De Smedt, & Op de Beeck, 2015;Cavdaroglu, Katz, & Knops, 2015;Eger et al, 2009;Harvey, Klein, For example, sets of 4, 8, 16 or 32 objects evoke different patterns of IPS activity. After training, a linear support vector machine can use these IPS activity patterns to predict which quantity the participant viewed on a given trial (Eger et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Neural basis of approximate number system develops independent of visual experience

Kanjlia¹,

Feigenson²,

Bedny³

2019

Preprint

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Thinking about numerical quantities is an integral part of daily human life that is supported by the intraparietal sulcus (IPS). The IPS is recruited during mathematical calculation and neuronal populations within the IPS code for the quantity of items in a set. Is the developmental basis of IPS number representations rooted in visual experience? We asked if the IPS possesses population codes for auditory quantities in sighted individuals and, critically, whether it does in the absence of any visual experience in congenitally blind individuals. We found that sequences of 4, 8, 16 and 32 tones each elicited unique patterns of fMRI activity in the IPS of both sighted and congenitally blind individuals, such that the quantity a participant heard on a given trial could be reliably predicted based on the pattern of observed IPS activity. This finding suggests that the IPS number system is resilient to dramatic changes in sensory experience. 43 -72 36 8.99 Right subcentral gyrus and sulci 56 -13 16 8.79 Right precuneus 6 -72 48 8.54 Right inferior occipital gyrus and sulcus 45 -72 -7 8.49 Right middle temporal gyrus 64 -46 0 8.24 Right inferior temporal gyrus 56 -46 -23 7.95 Right straight gyrus 5 47 -17 7.65

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“…Recent studies with careful response localization on the cortical surface show numerosity information at NPC map locations 15 , or at NPC map locations together with the IPS 14 . However, IPS activation probably reflects responses to comparison tasks (which our subjects did not perform) rather than numerosity [45][46][47] . Furthermore, most studies use larger numerosities than the preferred numerosities that we find.…”

Section: Nature Human Behaviourmentioning

confidence: 99%

A network of topographic numerosity maps in human association cortex

2017

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Sensory and motor cortices each contain multiple topographic maps with the structure of sensory organs (such as the retina or cochlea) mapped onto the cortical surface. These sensory maps are hierarchically organized. For example, visual field maps contain neurons that represent increasingly large parts of visual space with increasingly complex responses 1 . Some visual neurons respond to stimuli with a particular numerositythe number of objects in a set. We recently discovered a parietal topographic numerosity map in which neural numerosity preferences progress gradually across the cortical surface . Here we use ultra-highfield (7 Tesla, 7T) functional magnetic resonance imaging (fMRI) and neural-model-based analyses to reveal numerosityselective neural populations organized into six widely separated topographic maps in each hemisphere. Although we describe subtle differences between these maps, their properties are very similar, unlike in sensory map hierarchies. These maps are found in areas implicated in object recognition, motion perception, attention control, decision-making and mathematics. Multiple numerosity maps may allow interactions with these cognitive systems, suggesting a broad role for quantity processing in supporting many perceptual and cognitive functions.Topographic maps have an orderly organization of neurons with similar functions. The close proximity of neurons with similar functions minimizes local connection lengths to increase neural processing efficiency [10][11][12] . Furthermore, topographic maps allow simple one-to-one projections between maps. Finally, most neural processes are context-dependent. Topographic maps allow easy computations of context through comparisons between neighbouring neurons. Therefore, topographic organization has several benefits and gives a theoretical framework to explain why maps emerge in cognitive processing, as we recently demonstrated 2 and extend here. Together with this numerosity map, we also demonstrated that another quantity, object size, is processed in a distinct object size map that largely overlaps with this parietal numerosity map, showing correlated numerosity and object size preferences 13 . The parietal numerosity map that we have described encompasses part of a network implicated in numerosity processing, extending into occipital, parietal and frontal areas [14][15][16][17][18][19] . The fine-scale organization elsewhere in this numerosity network is unknown. We hypothesize that, like sensory maps, a hierarchy of several numerosity maps throughout human association cortices underlies this numerosity network. To investigate this hypothesis, we adapted our approach to reconstruct numerosity maps throughout the brain.We displayed visual stimuli of changing numerosity while collecting ultra-high-field (7T) fMRI data covering the occipital, parietal, posterior-superior frontal and temporal lobes. We distinguished between responses to numerosity and co-varying stimulus features using several stimulus configurations 2,16 . We summarized the fMRI...

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Dissociating estimation from comparison and response eliminates parietal involvement in sequential numerosity perception

Cited by 38 publications

References 70 publications

Mapping numerical perception and operations in relation to functional and anatomical landmarks of human parietal cortex

Mapping numerical perception and operations in relation to functional and anatomical landmarks of human parietal cortex

Neural basis of approximate number system develops independent of visual experience

A network of topographic numerosity maps in human association cortex

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