Cortical connections and the functional organization of posterior parietal cortex

1980 ◽  
Vol 3 (4) ◽  
pp. 511-513 ◽  
Author(s):  
Deepak N. Pandya ◽  
Benjamin Seltzer
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Functional Organization ◽  
Cortical Connections ◽  
Posterior Parietal

scholarly journals Functional organization of human posterior parietal cortex: grasping- and reaching-related activations relative to topographically organized cortex

2013 ◽  
Vol 109 (12) ◽  
pp. 2897-2908 ◽  
Author(s):  
Christina S. Konen ◽  
Ryan E. B. Mruczek ◽  
Jessica L. Montoya ◽  
Sabine Kastner
Keyword(s):  
Neural Networks ◽  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Functional Organization ◽  
Macaque Monkey ◽  
Superior Parietal Lobule ◽  
Movement Type ◽  
The Neural Networks ◽  
Posterior Parietal ◽  
The Relationship

The act of reaching to grasp an object requires the coordination between transporting the arm and shaping the hand. Neurophysiological, neuroimaging, neuroanatomic, and neuropsychological studies in macaque monkeys and humans suggest that the neural networks underlying grasping and reaching acts are at least partially separable within the posterior parietal cortex (PPC). To better understand how these neural networks have evolved in primates, we characterized the relationship between grasping- and reaching-related responses and topographically organized areas of the human intraparietal sulcus (IPS) using functional MRI. Grasping-specific activation was localized to the left anterior IPS, partially overlapping with the most anterior topographic regions and extending into the postcentral sulcus. Reaching-specific activation was localized to the left precuneus and superior parietal lobule, partially overlapping with the medial aspects of the more posterior topographic regions. Although the majority of activity within the topographic regions of the IPS was nonspecific with respect to movement type, we found evidence for a functional gradient of specificity for reaching and grasping movements spanning posterior-medial to anterior-lateral PPC. In contrast to the macaque monkey, grasp- and reach-specific activations were largely located outside of the human IPS.

scholarly journals Cortical Connections of the Caudal Portion of Posterior Parietal Cortex in Prosimian Galagos

2015 ◽  
Vol 26 (6) ◽  
pp. 2753-2777 ◽  
Author(s):  
Iwona Stepniewska ◽  
Christina M. Cerkevich ◽  
Jon H. Kaas
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Cortical Connections ◽  
Caudal Portion ◽  
Posterior Parietal

scholarly journals Architecture and organization of mouse posterior parietal cortex relative to extrastriate areas

2018 ◽  
Author(s):  
Karoline Hovde ◽  
Michele Gianatti ◽  
Menno P. Witter ◽  
Jonathan R. Whitlock
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Muscarinic Acetylcholine Receptor ◽  
Thalamic Nuclei ◽  
Cortical Connections ◽  
Posterior Parietal ◽  
Definition Of ◽  
Anterograde Tracer ◽  
Higher Visual Areas ◽  
Extrastriate Areas

ABSTRACTThe posterior parietal cortex (PPC) is a multifaceted region of cortex, contributing to several cognitive processes including sensorimotor integration and spatial navigation. Although recent years have seen a considerable rise in the use of rodents, particularly mice, to investigate PPC and related networks, a coherent anatomical definition of PPC in the mouse is still lacking. To address this, we delineated the mouse PPC using cyto- and chemoarchitectural markers from Nissl-, parvalbumin- and muscarinic acetylcholine receptor M2-staining. Additionally, we performed bilateral triple anterograde tracer injections in primary visual cortex (V1) and prepared flattened tangential sections from one hemisphere and coronal sections from the other, allowing us to co-register the cytoarchitectural features of PPC with V1 projections. In charting the location of extrastriate areas and the architectural features of PPC in the context of each other, we reconcile different, widely used conventions for demarcating PPC in the mouse. Furthermore, triple anterograde tracer injections in PPC showed strong projections to associative thalamic nuclei as well as higher visual areas, orbitofrontal, cingulate and secondary motor cortices. Retrograde circuit mapping with rabies virus further showed that all cortical connections were reciprocal. These combined approaches provide a coherent definition of mouse PPC that incorporates laminar architecture, extrastriate projections, thalamic, and cortico-cortical connections.

scholarly journals Differences in Intrinsic Functional Organization Between Dorsolateral Prefrontal and Posterior Parietal Cortex

2013 ◽  
Vol 24 (9) ◽  
pp. 2334-2349 ◽  
Author(s):  
F. Katsuki ◽  
X.-L. Qi ◽  
T. Meyer ◽  
P. M. Kostelic ◽  
E. Salinas ◽  
...  
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Functional Organization ◽  
Dorsolateral Prefrontal ◽  
Posterior Parietal

scholarly journals State Estimation in Posterior Parietal Cortex: Distinct Poles of Environmental and Bodily States

2019 ◽  
Author(s):  
W. Pieter Medendorp ◽  
Tobias Heed
Keyword(s):  
Parietal Cortex ◽  
Information Seeking ◽  
Posterior Parietal Cortex ◽  
Functional Organization ◽  
Novelty Detection ◽  
The Body ◽  
Main Role ◽  
Motor Processing ◽  
Posterior Parietal ◽  
And Function

Posterior parietal cortex (PPC) has been implicated in sensory and motor processing, but its underlying organization is still debated. Sensory-based accounts suggest that PPC is mainly involved in attentional selection and multisensory integration, serving novelty detection and information seeking. Motor-specific accounts suggest a parietal subdivision into lower-dimensional, effector-specific subspaces for planning motor action. More recently, function-based interpretations have been put forward based on coordinated responses across multiple effectors evoked by circumscribed PPC regions. In this review, we posit that an overarching interpretation of PPC’s functional organization must integrate, rather than contrast, these various accounts of PPC. We propose that PPC’s main role is that of a state estimator, which extends into two poles: a rostral, body-related pole, which projects the environment onto the body and a caudal, environment-related pole that projects the body into an environment landscape. The combined topology interweaves perceptual, motor, and function-specific principles, and suggests that actions are specified by top-down guided optimization of body-environment interactions.

The functional organization of posterior parietal association cortex

1980 ◽  
Vol 3 (4) ◽  
pp. 485-499 ◽  
Author(s):  
James C. Lynch
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Functional Organization ◽  
Sensory Information ◽  
Current Data ◽  
Neural Mechanisms ◽  
Oculomotor Control ◽  
Association Cortex ◽  
Parietal Association Cortex ◽  
Posterior Parietal

AbstractPosterior parietal cortex has traditionally been considered to be a sensory association area in which higher-order processing and intermodal integration of incoming sensory information occurs. In this paper, evidence from clinical reports and from lesion and behavioral-electrophysiological experiments using monkeys is reviewed and discussed in relation to the overall functional organization of posterior parietal association cortex, and particularly with respect to a proposed posterior parietal mechanism concerned with the initiation and control of certain classes of eye and limb movements. Preliminary data from studies of the effects of posterior parietal lesions on oculomotor control in monkeys are reported.The behavioral effects of lesions of posterior parietal cortex in monkeys have been found to be similar to those which follow analogous damage of the minor hemisphere in humans, while behavioral-electrophysiological experiments have disclosed classes of neurons in this area which have functional properties closely related to the behavioral acts that are disrupted by lesions of the area. On the basis of current data from these areas of study, it is proposed that the sensory association model of posterior parietal function is inadequate to account for the complexities of the present evidence. Instead, it now appears that many diverse neural mechanisms are locatedin partin parietal cortex, that some of these mechanisms are involved in sensory processing and perceptual functions, but that others participate in motor control, and that still others are involved in attentional, motivational, or emotional processes. It is further proposed that the elementary units of these various neural mechanisms are distributed within posterior parietal cortex according to the columnar hypothesis of Mountcastle.

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