scholarly journals Cortical connections of area 2 and posterior parietal area 5 in macaque monkeys

2018 ◽  
Vol 527 (3) ◽  
pp. 718-737 ◽  
Author(s):  
Jeffrey Padberg ◽  
Dylan F. Cooke ◽  
Christina M. Cerkevich ◽  
Jon H. Kaas ◽  
Leah Krubitzer
Keyword(s):  
Macaque Monkeys ◽  
Parietal Area ◽  
Cortical Connections ◽  
Area 5 ◽  
Posterior Parietal

scholarly journals Lesions in Posterior Parietal Area 5 in Monkeys Result in Rapid Behavioral and Cortical Plasticity

2010 ◽  
Vol 30 (39) ◽  
pp. 12918-12935 ◽  
Author(s):  
J. Padberg ◽  
G. Recanzone ◽  
J. Engle ◽  
D. Cooke ◽  
A. Goldring ◽  
...  
Keyword(s):  
Cortical Plasticity ◽  
Parietal Area ◽  
Area 5 ◽  
Posterior Parietal

Cortical connections of the second somatosensory area and the parietal ventral area in macaque monkeys

2003 ◽  
Vol 462 (4) ◽  
pp. 382-399 ◽  
Author(s):  
Elizabeth Disbrow ◽  
Evangelos Litinas ◽  
Gregg H. Recanzone ◽  
Jeffrey Padberg ◽  
Leah Krubitzer
Keyword(s):  
Macaque Monkeys ◽  
Somatosensory Area ◽  
Cortical Connections ◽  
Ventral Area

scholarly journals Neurophysiology of Prehension. III. Representation of Object Features in Posterior Parietal Cortex of the Macaque Monkey

2007 ◽  
Vol 98 (6) ◽  
pp. 3708-3730 ◽  
Author(s):  
Esther P. Gardner ◽  
K. Srinivasa Babu ◽  
Soumya Ghosh ◽  
Adam Sherwood ◽  
Jessie Chen
Keyword(s):  
Parietal Cortex ◽  
Posterior Parietal Cortex ◽  
Macaque Monkey ◽  
Firing Rates ◽  
Video Recordings ◽  
Object Properties ◽  
Area 5 ◽  
Somatosensory Input ◽  
Posterior Parietal ◽  
Object Features

Neurons in posterior parietal cortex (PPC) may serve both proprioceptive and exteroceptive functions during prehension, signaling hand actions and object properties. To assess these roles, we used digital video recordings to analyze responses of 83 hand-manipulation neurons in area 5 as monkeys grasped and lifted objects that differed in shape (round and rectangular), size (large and small spheres), and location (identical rectangular blocks placed lateral and medial to the shoulder). The task contained seven stages—approach, contact, grasp, lift, hold, lower, relax—plus a pretrial interval. The four test objects evoked similar spike trains and mean rate profiles that rose significantly above baseline from approach through lift, with peak activity at contact. Although representation by the spike train of specific hand actions was stronger than distinctions between grasped objects, 34% of these neurons showed statistically significant effects of object properties or hand postures on firing rates. Somatosensory input from the hand played an important role as firing rates diverged most prominently on contact as grasp was secured. The small sphere—grasped with the most flexed hand posture—evoked the highest firing rates in 43% of the population. Twenty-one percent distinguished spheres that differed in size and weight, and 14% discriminated spheres from rectangular blocks. Location in the workspace modulated response amplitude as objects placed across the midline evoked higher firing rates than positions lateral to the shoulder. We conclude that area 5 neurons, like those in area AIP, integrate object features, hand actions, and grasp postures during prehension.

Reaching-related Neurons in Superior Parietal Area 5: Influence of the Target Visibility

2016 ◽  
Vol 28 (11) ◽  
pp. 1828-1837 ◽  
Author(s):  
Emiliano Brunamonti ◽  
Aldo Genovesio ◽  
Pierpaolo Pani ◽  
Roberto Caminiti ◽  
Stefano Ferraina
Keyword(s):  
Visual Information ◽  
Posterior Parietal Cortex ◽  
Hand Movement ◽  
Visual Signals ◽  
Hand Position ◽  
Movement Initiation ◽  
Starting Position ◽  
Area 5 ◽  
Posterior Parietal ◽  
Target Visibility

Reaching movements require the integration of both somatic and visual information. These signals can have different relevance, depending on whether reaches are performed toward visual or memorized targets. We tested the hypothesis that under such conditions, therefore depending on target visibility, posterior parietal neurons integrate differently somatic and visual signals. Monkeys were trained to execute both types of reaches from different hand resting positions and in total darkness. Neural activity was recorded in Area 5 (PE) and analyzed by focusing on the preparatory epoch, that is, before movement initiation. Many neurons were influenced by the initial hand position, and most of them were further modulated by the target visibility. For the same starting position, we found a prevalence of neurons with activity that differed depending on whether hand movement was performed toward memorized or visual targets. This result suggests that posterior parietal cortex integrates available signals in a flexible way based on contextual demands.

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