Evidence for two types of spatial representations: Hemispheric specialization for categorical and coordinate relations.

Kosslyn, Stephen M.; Koenig, Olivier; Barrett, Anna M.; Cave, Carolyn Backer; Tang, Joyce; Gabrieli, John D. E.

doi:10.1037/0096-1523.15.4.723

Cited by 343 publications

(381 citation statements)

References 18 publications

(35 reference statements)

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“…This group result was confirmed at the single subject level, where all ten subjects participating in the study showed activation in those regions, and only four out of ten showed some activated voxels in the left hemisphere, all in small clusters inconsistently located even within these four subjects. The identification of such right lateralized circuit confirms previous behavioural studies that used tachistoscopic presentation and neurosychological reports suggesting a right hemisphere superiority for numerosity estimation (Kimura, 1996;Kosslyn et al, 1989b;McGlone and Davidson, 1973;Warrington and James, 1967;Young and Bion, 1979). Our results also revealed that the activation of the right lateralised circuit involved in estimation was not modulated by the modality (visual or auditory) in which stimuli were presented.…”

Section: An A-modal Right Hemisphere Superiority For Approximate Numesupporting

confidence: 90%

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Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Piazza

Mechelli

Price³

et al. 2006

Brain Research

198

161

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Human adults can assess the number of objects in a set (numerosity) by approximate estimation or by exact counting. There is evidence suggesting that numerosity estimation depends on a dedicated mechanism that is a-modal and non-verbal. By contrast, counting requires the coordination between the pre-existing numerosity estimation abilities with language and one-to-one correspondence principles. In this paper we investigate with fMRI the neural correlates of numerosity estimation and counting in human adults, using both visual and auditory stimuli. Results show that attending to approximate numerosity correlates with increased activity of a right lateralized fronto-parietal cortical network, and that this activity is independent of the stimuli presentation's modality. Counting activates additional left prefrontal, parietal, and bilateral premotor areas, again independently from stimulus modality. These results dissociate two neuronal systems that underlie different numerosity judgements. SECTION:Cognitive and Behavioural Neuroscience

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Section: An A-modal Right Hemisphere Superiority For Approximate Numesupporting

confidence: 90%

“…Indeed, a right hemisphere superiority in quantity estimation was replicated using unilateral tachistoscopic presentation of stimuli to normal subjects (Kosslyn et al, 1989a;McGlone and Davidson, 1973;Young and Bion, 1979).…”

Section: Estimationmentioning

confidence: 94%

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Piazza

Mechelli

Price³

et al. 2006

Brain Research

198

161

View full text Add to dashboard Cite

show abstract

“…However, whereas this might be the case when processing the relative or exact positions of objects (i.e., binding processes), this does not seem likely when merely remembering categorical or coordinate position information. Kosslyn et al (1989) showed that healthy participants could evaluate categorical representations better when they were initially presented to the left hemisphere, whereas coordinate representations were evaluated better when information was initially presented to the right hemisphere (Kosslyn et al, 1989). Similar effects were found when examining the processing of categorical and coordinate position information in patients with focal lesions in either the left or right hemisphere (Laeng, 1994).…”

Section: Introductionsupporting

confidence: 52%

“…Categorical relations would be primarily subserved by brain areas in the left hemisphere, whereas the more ''purely'' spatial nature of coordinate representations suggests that they are more effectively encoded by the right hemisphere. This lateralization effect might be related to the fact that language processes depend on the left hemisphere, whereas spatial processes (e.g., navigation) depend on the right hemisphere (Kosslyn et al, 1989). However, whereas this might be the case when processing the relative or exact positions of objects (i.e., binding processes), this does not seem likely when merely remembering categorical or coordinate position information.…”

Section: Introductionmentioning

confidence: 98%

“…This type of information ignores the exact spatial position of an object, and categorizes objects according to a certain relation (above/below, left/right, inside/outside). In contrast, coordinate representations contain fine-grained, metric information, which can be used to guide actions, particularly when visual information is not at hand or insufficient, such as when walking around in the dark (Kosslyn et al, 1989). Arguably, encoding of coordinate spatial information and of categorical spatial information rely on distinct subsystems.…”

Section: Introductionmentioning

confidence: 99%

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Categorical and coordinate spatial representations within object-location memory

Asselen

Kessels

Kappelle

et al. 2008

Cortex

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a b s t r a c tAn important aspect of spatial memory is the ability to remember the positions of objects around us. There is evidence that spatial information can be represented in different ways, involving a coordinate representation (fine-grained, metric information) and a categorical representation (above/below, right/left relations). The current study is aimed at investigating possible lateralization effects for categorical and coordinate information when encoding position information alone and when integrating position information and object information in memory. Twenty-five patients who had suffered from a stroke and 36 healthy controls were tested with different tests assessing categorical and coordinate position memory, and categorical and coordinate object-to-position memory. The identity task that was used by (Laeng, 1994) was included as well as a control task for measuring lateralization effect for categorical and coordinate information. Moreover, object-recognition and visuo-spatial perception were assessed. The results showed that processing categorical and coordinate spatial information were impaired by a lesion in the left and right hemisphere, respectively. No lateralization effects were found when spatial information had to be integrated with object information. These results bear on the functional components of object-location memory and their underlying hemispheric basis. ª 2007 Elsevier Masson Srl. All rights reserved. IntroductionObject-location memory is an important aspect of spatial memory, enabling us to remember the positions of objects in our environment. Milner (1981, 1989) showed that object-location memory is impaired by damage to the right medial temporal lobe (MTL) (Kopelman et al., 1997). In particular, the right parahippocampal gyrus (Milner et al., 1997) and the right hippocampus (Crane and Milner, 2004; Stepankova et al., 2004) seem to be involved in processing object-location information in memory. Importantly, however, object-location memory is not a unitary construct, but can be subdivided into a number of components. Processing object information and position information clearly deal with distinct aspects (Moscovitch et al., 1995), whereas a third process is responsible for the integration of these two features. These components can be selectively impaired, as was shown by examining patients with focal lesions with

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Hemispheric preference in visuospatial processing: A complementary approach with fMRI and lesion studies

Ng¹,

Eslinger²,

Williams³

et al. 2000

Hum. Brain Mapp.

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Historically, the left cerebral hemisphere has been considered specialized for language, whereas the right cerebral hemisphere is aligned with spatial processes. However, studies have called into question adherence to this model and suggested that both hemispheres participate in language and spatial cognition. Using functional Magnetic Resonance Imaging (fMRI) and human brain lesion studies, we determined whether these complementary techniques could clarify issues of hemispheric dominance. Using a modified Benton Judgement of Line Orientation (JLO) test, considered a relatively pure spatial processing task, we found robust and significant (p < 0.0005) bilateral superior parietal lobe activation on fMRI in ten right-handed male adult volunteers. This was corroborated by lesion data in a cohort of 17 patients who showed significant JLO impairments after either right or left parietal lobe damage, with right parietal damage associated with somewhat more severe deficit. Detailed wavelet analysis of the fMRI time-series did, however, reveal a more dominant role of the right parietal lobe in "kick-starting" the task. To our knowledge, this is a novel way of using fMRI to address functional hemispheric differences in a cognitive task that is known to have bilateral representation.

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Evidence for two types of spatial representations: Hemispheric specialization for categorical and coordinate relations.

Cited by 343 publications

References 18 publications

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Exact and approximate judgements of visual and auditory numerosity: An fMRI study

Categorical and coordinate spatial representations within object-location memory

Hemispheric preference in visuospatial processing: A complementary approach with fMRI and lesion studies

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