scholarly journals Prominent activation of the intraparietal and somatosensory areas during angle discrimination by intra-active touch

2011 ◽  
Vol 33 (12) ◽  
pp. 2957-2970 ◽  
Author(s):  
Jiajia Yang ◽  
Hongbin Han ◽  
Dehua Chui ◽  
Yong Shen ◽  
Jinglong Wu
Keyword(s):  
Active Touch ◽  
Angle Discrimination ◽  
Somatosensory Areas

Organisation of Sensorimotor Integration during Active Touch: an fMRI study

NeuroImage ◽  
2009 ◽  
Vol 47 ◽  
pp. S131
Author(s):  
F. Kurth ◽  
K. Zilles ◽  
L.E. Wang ◽  
M. Dafotakis ◽  
K. Amunts ◽  
...  
Keyword(s):  
Sensorimotor Integration ◽  
Active Touch ◽  
Fmri Study

Toward an agreement on terminology of nuclear and subnuclear divisions of the motor thalamus

1997 ◽  
Vol 86 (4) ◽  
pp. 670-685 ◽  
Author(s):  
Giorgio Macchi ◽  
Edward G. Jones
Keyword(s):  
Nonhuman Primates ◽  
Experimental Studies ◽  
Medial Lemniscus ◽  
Nuclear Mass ◽  
Content Type ◽  
Human Thalamus ◽  
Human Motor ◽  
Motor Thalamus ◽  
Fine Print ◽  
Somatosensory Areas

✓ The nomenclature most commonly applied to the motor-related nuclei of the human thalamus differs substantially from that applied to the thalamus of other primates, from which most knowledge of input—output connections is derived. Knowledge of these connections in the human is a prerequisite for stereotactic neurosurgical approaches designed to alleviate movement disorders by the placement of lesions in specific nuclei. Transfer to humans of connectional information derived from experimental studies in nonhuman primates requires agreement about the equivalence of nuclei in the different species, and dialogue between experimentalists and neurosurgeons would be facilitated by the use of a common nomenclature. In this review, the authors compare the different nomenclatures and review the cyto- and chemoarchitecture of the nuclei in the anterolateral aspect of the ventral nuclear mass in humans and monkeys, suggest which nuclei are equivalent, and propose a common terminology. On this basis, it is possible to identify the nuclei of the human motor thalamus that transfer information from the substantia nigra, globus pallidus, cerebellum, and proprioceptive components of the medial lemniscus to prefrontal, premotor, motor, and somatosensory areas of the cerebral cortex. It also becomes possible to suggest the principal functional systems involved in stereotactically guided thalamotomies and the functional basis of the symptoms observed following ischemic lesions in different parts of the human thalamus.

scholarly journals Angle discrimination depends on the shape of the triangle

2004 ◽  
Vol 4 (8) ◽  
pp. 660-660
Author(s):  
G. J. Kennedy ◽  
H. S. Orbach ◽  
G. Loffler
Keyword(s):  
Angle Discrimination

scholarly journals Investigating key functions of hand movements by individuals with visual impairment: Improving teaching practices in special education through research

2016 ◽  
Vol 6 (1) ◽  
pp. 02 ◽  
Author(s):  
Vassilios Sotirios Argyropoulos ◽  
Sofia Chamonikolaou
Keyword(s):  
Visual Impairment ◽  
Teaching Practices ◽  
Active Touch ◽  
Hand Movements ◽  
Second Phase ◽  
Geometric Shapes ◽  
Think Aloud Protocols ◽  
Global Properties ◽  
Exploratory Movement ◽  
Active Exploration

AbstractResearch is still ongoing with regard to types of exploratory movement by active touch and its key functions in individuals with visual impairment. The aim of the present study was to describe and identify different types of exploratory movement performed by individuals with visual impairment in their exploration of geometric shapes. A total of twelve participants were asked to explore a number of simple and complex geometric shapes. The research design consisted of two research phases. In the first phase, the participants were asked to describe and, if possible, to identify the properties of each shape. In the second phase, the participants were asked to describe their hand movements during active exploration. The findings indicated that the participants utilized different movements to extract the featural and global properties of the shapes. It was also observed that some patterns of exploratory movement were present in all of the participants’ strategies, which indicated issues of laterality. Finally, the research highlighted that by observing patterns of exploratory movement, educators of students with visual impairment can determine which strategies may be worth exploring with a view to their adoption in teaching practices and instruction. Keywords: visual impairment, active touch, geometric shapes, think -aloud protocols, laterality, teaching practices

scholarly journals Edge orientation perception during active touch

2018 ◽  
Vol 120 (5) ◽  
pp. 2423-2429 ◽  
Author(s):  
Derek Olczak ◽  
Vaishnavi Sukumar ◽  
J. Andrew Pruszynski
Keyword(s):  
Motor System ◽  
Active Touch ◽  
Contact Forces ◽  
Edge Orientation ◽  
Passive Touch ◽  
Per Se ◽  
Orientation Perception ◽  
Psychophysical Studies ◽  
Psychophysical Task ◽  
Better Than

Previous studies investigating the perceptual attributes of tactile edge orientation processing have applied their stimuli to an immobilized fingertip. Here we tested the perceptual attributes of edge orientation processing when participants actively touched the stimulus. Our participants moved their finger over two pairs of edges, one pair parallel and the other nonparallel to varying degrees, and were asked to identify which of the two pairs was nonparallel. In addition to the psychophysical estimates of edge orientation acuity, we measured the speed at which participants moved their finger and the forces they exerted when moving their finger over the stimulus. We report four main findings. First, edge orientation acuity during active touch averaged 12.4°, similar to that previously reported during passive touch. Second, on average, participants moved their finger over the stimuli at ~20 mm/s and exerted contact forces of ~0.3 N. Third, there was no clear relationship between how people moved their finger or how they pressed on the stimulus and their edge orientation acuity. Fourth, consistent with previous work testing tactile spatial acuity, we found a significant correlation between fingertip size and orientation acuity such that people with smaller fingertips tended to have better orientation acuity. NEW & NOTEWORTHY Edge orientation acuity expressed by the motor system during manipulation is many times better than edge orientation acuity assessed in psychophysical studies where stimuli are applied to a passive fingertip. Here we show that this advantage is not because of movement per se because edge orientation acuity assessed in a psychophysical task, where participants actively move their finger over the stimuli, yields results similar to previous passive psychophysical studies.

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