Overlapping representations for grip type and reach direction

Fabbri, Sara; Strnad, Lukas; Caramazza, Alfonso; Lingnau, Angelika

doi:10.1016/j.neuroimage.2014.03.017

Cited by 63 publications

(88 citation statements)

References 68 publications

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“…(2011) and Fabbri et al. (2014), which provided evidence of distinct representations for reaching‐only and reach‐to‐grasp actions, distributed across a wide frontoparietal network; (5) replicating the findings of Monaco et al. (2015) on the representation of the object size during reach‐to‐grasp actions.…”

Section: Introductionsupporting

confidence: 73%

“…However, Fabbri et al. (2014) focused their attention only on the left hemisphere, discarding possible results within the right hemisphere, whereas here we show that the lack of grasp type selectivity characterizes both contralateral and ipsilateral SPOC.…”

Section: Discussioncontrasting

confidence: 47%

“…In contrast, our results are consistent with the study of Fabbri et al. (2014), in which the comparison between PG and WHG actions toward a spherical object of constant size did not reveal any grasp type selectivity for the left SPOC. However, Fabbri et al.…”

Section: Discussionmentioning

confidence: 92%

“…(2014). Specifically, SPLa broadly corresponds to monkey ventral intraparietal area (VIP; Mars et al.…”

Section: Discussionmentioning

confidence: 99%

“…2011; Fabbri et al. 2014). We then trained a support vector machine (SVM) classifier (see Pereira et al.…”

Section: Introductionmentioning

confidence: 99%

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Probing the reaching–grasping network in humans through multivoxel pattern decoding

et al. 2015

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IntroductionThe quest for a putative human homolog of the reaching–grasping network identified in monkeys has been the focus of many neuropsychological and neuroimaging studies in recent years. These studies have shown that the network underlying reaching‐only and reach‐to‐grasp movements includes the superior parieto‐occipital cortex (SPOC), the anterior part of the human intraparietal sulcus (hAIP), the ventral and the dorsal portion of the premotor cortex, and the primary motor cortex (M1). Recent evidence for a wider frontoparietal network coding for different aspects of reaching‐only and reach‐to‐grasp actions calls for a more fine‐grained assessment of the reaching–grasping network in humans by exploiting pattern decoding methods (multivoxel pattern analysis—MVPA).MethodsHere, we used MPVA on functional magnetic resonance imaging (fMRI) data to assess whether regions of the frontoparietal network discriminate between reaching‐only and reach‐to‐grasp actions, natural and constrained grasping, different grasp types, and object sizes. Participants were required to perform either reaching‐only movements or two reach‐to‐grasp types (precision or whole hand grasp) upon spherical objects of different sizes.ResultsMultivoxel pattern analysis highlighted that, independently from the object size, all the selected regions of both hemispheres contribute in coding for grasp type, with the exception of SPOC and the right hAIP. Consistent with recent neurophysiological findings on monkeys, there was no evidence for a clear‐cut distinction between a dorsomedial and a dorsolateral pathway that would be specialized for reaching‐only and reach‐to‐grasp actions, respectively. Nevertheless, the comparison of decoding accuracy across brain areas highlighted their different contributions to reaching‐only and grasping actions.ConclusionsAltogether, our findings enrich the current knowledge regarding the functional role of key brain areas involved in the cortical control of reaching‐only and reach‐to‐grasp actions in humans, by revealing novel fine‐grained distinctions among action types within a wide frontoparietal network.

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Section: Introductionsupporting

confidence: 73%

Section: Discussioncontrasting

confidence: 47%

Section: Discussionmentioning

confidence: 92%

“…(2014). Specifically, SPLa broadly corresponds to monkey ventral intraparietal area (VIP; Mars et al.…”

Section: Discussionmentioning

confidence: 99%

“…2011; Fabbri et al. 2014). We then trained a support vector machine (SVM) classifier (see Pereira et al.…”

Section: Introductionmentioning

confidence: 99%

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Probing the reaching–grasping network in humans through multivoxel pattern decoding

et al. 2015

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Structural connectivity and functional properties of the macaque superior parietal lobule

et al. 2019

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Despite the consolidated belief that the macaque superior parietal lobule (SPL) is entirely occupied by Brodmann's area 5, recent data show that macaque SPL also hosts a large cortical region with structural and functional features similar to that of Brodmann's area 7. According to these data, the anterior part of SPL is occupied by a somatosensory-dominated cortical region that hosts three architectural and functional distinct regions (PE, PEci, PEip), and the caudal half of SPL by a bimodal somato-visual region that hosts four areas: PEc, MIP, PGm, V6A.To date, the most studied areas of SPL are PE, PEc, and V6A. PE is essentially a high-order somatomotor area, while PEc and V6A are bimodal somatomotor-visuomotor areas, the former with predominant somatosensory input, the latter with predominant visual input. The functional properties of these areas and their anatomical connectivity strongly suggest their involvement in the control of limb movements. PE is suggested to be involved in the preparation/execution of limb movements, in particular the movements of the upper limb; PEc in the control of movements of both upper and lower limbs, as well as in their interaction with the visual environment; V6A in the control of reach-to-grasp movements performed with the upper limb.In humans, SPL is traditionally considered to have a different organization with respect to macaques. Here, we review several lines of evidence suggesting that this is not the case, showing a similar structure for human and nonhuman primate SPLs.

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Action goals and the praxis network: an fMRI study

et al. 2022

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The praxis representation network (PRN) of the left cerebral hemisphere is typically linked to the control of functional interactions with familiar tools. Surprisingly, little is known about the PRN engagement in planning and execution of tool-directed actions motivated by non-functional but purposeful action goals. Here we used functional neuroimaging to perform both univariate and multi-voxel pattern analyses (MVPA) in 20 right-handed participants who planned and later executed, with their dominant and non-dominant hands, disparate grasps of tools for different goals, including: (1) planning simple vs. demanding functional grasps of conveniently vs. inconveniently oriented tools with an intention to immediately use them, (2) planning simple—but non-functional—grasps of inconveniently oriented tools with a goal to pass them to a different person, (3) planning reaching movements directed at such tools with an intention to move/push them with the back of the hand, and (4) pantomimed execution of the earlier planned tasks. While PRN contributed to the studied interactions with tools, the engagement of its critical nodes, and/or complementary right hemisphere processing, was differently modulated by task type. E.g., planning non-functional/structural grasp-to-pass movements of inconveniently oriented tools, regardless of the hand, invoked the left parietal and prefrontal nodes significantly more than simple, non-demanding functional grasps. MVPA corroborated decoding capabilities of critical PRN areas and some of their right hemisphere counterparts. Our findings shed new lights on how performance of disparate action goals influences the extraction of object affordances, and how or to what extent it modulates the neural activity within the parieto-frontal brain networks.

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Overlapping representations for grip type and reach direction

Cited by 63 publications

References 68 publications

Probing the reaching–grasping network in humans through multivoxel pattern decoding

Probing the reaching–grasping network in humans through multivoxel pattern decoding

Structural connectivity and functional properties of the macaque superior parietal lobule

Action goals and the praxis network: an fMRI study

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