| Records |
| Author |
Awasthi, B.; Sowman, P.F.; Friedman, J.; Williams, M.A. |
| Title |
Distinct spatial scale sensitivities for early categorisation of Faces and Places: Neuromagnetic and Behavioural Findings |
Type |
Journal Article |
| Year |
2013 |
Publication |
Frontiers in Human Neuroscience |
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| Volume |
7 |
Issue |
91 |
Pages |
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| Abstract |
Research exploring the role of spatial frequencies in rapid stimulus detection and categorisation report flexible reliance on specific spatial frequency bands. Here, through a set of behavioural and magnetoencephalography (MEG) experiments, we investigated the role of low spatial frequency (LSF)(25 cpf) information during the categorisation of faces and places. Reaction time measures revealed significantly faster categorisation of faces driven by LSF information, while rapid categorisation of places was facilitated by HSF information. The MEG study showed significantly earlier latency of the M170 component for LSF faces compared to HSF faces. Moreover, the M170 amplitude was larger for LSF faces than for LSF places, whereas the reverse pattern was evident for HSF faces and places. These results suggest that spatial frequency modulates the processing of category specific information for faces and places. |
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1662-5161 |
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67 |
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| Author |
Noy, L.; Alon, U.; Friedman, J. |
| Title |
Corrective jitter motion shows similar individual frequencies for the arm and the finger |
Type |
Journal Article |
| Year |
2015 |
Publication |
Experimental Brain Research |
Abbreviated Journal |
Exp Brain Res |
| Volume |
233 |
Issue |
4 |
Pages |
1307-1320 |
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| Abstract |
A characteristic of visuomotor tracking of non-regular oscillating stimuli are high-frequency jittery corrective motions, oscillating around the tracked stimuli. However, the properties of these corrective jitter responses are not well understood. For example, does the jitter response show an idiosyncratic signature? What is the relationship between stimuli properties and jitter properties? Is the jitter response similar across effectors with different inertial properties? To answer these questions, we measured participants' jitter frequencies in two tracking tasks in the arm and the finger. Thirty participants tracked the same set of eleven non-regular oscillating stimuli, vertically moving on a screen, once with forward-backward arm movements (holding a tablet stylus) and once with upward-downward index finger movements (with a motion tracker attached). Participants' jitter frequencies and tracking errors varied systematically as a function of stimuli frequency and amplitude. Additionally, there were clear individual differences in average jitter frequencies between participants, ranging from 0.7 to 1.15 Hz, similar to values reported previously. A comparison of individual jitter frequencies in the two tasks showed a strong correlation between participants' jitter frequencies in the finger and the arm, despite the very different inertial properties of the two effectors. This result suggests that the corrective jitter response stems from common neural processes. |
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English |
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0014-4819 |
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PMID:25630905 |
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no |
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76 |
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| Author |
Awasthi, B.; Williams, M.A.; Friedman, J. |
| Title |
Examining the role of red background in magnocellular contribution to face perception |
Type |
Journal Article |
| Year |
2016 |
Publication |
PeerJ |
Abbreviated Journal |
PeerJ |
| Volume |
4 |
Issue |
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Pages |
e1617 |
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| Abstract |
This study examines the role of the magnocellular system in the early stages of face perception, in particular sex categorization. Utilizing the specific property of magnocellular suppression in red light, we investigated visually guided reaching to low and high spatial frequency hybrid faces against red and grey backgrounds. The arm movement curvature measure shows that reduced response of the magnocellular pathway interferes with the low spatial frequency component of face perception. This finding provides behavioral evidence for magnocellular contribution to non-emotional aspect of face perception. |
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en |
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2167-8359 |
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no |
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81 |
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| Author |
Raveh, E.; Friedman, J.; Portnoy, S. |
| Title |
Visuomotor behaviors and performance in a dual-task paradigm with and without vibrotactile feedback when using a myoelectric controlled hand |
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Journal Article |
| Year |
2018 |
Publication |
Assistive Technology |
Abbreviated Journal |
Assistive Technology |
| Volume |
30 |
Issue |
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Pages |
274-280 |
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| ISSN |
1040-0435 |
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no |
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85 |
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| Author |
Shaklai, S.; Mimouni-Bloch, A.; Levin, M.; Friedman, J. |
| Title |
Development of finger force coordination in children |
Type |
Journal Article |
| Year |
2017 |
Publication |
Experimental Brain Research |
Abbreviated Journal |
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| Volume |
235 |
Issue |
12 |
Pages |
3709–3720 |
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| Abstract |
Coordination is often observed as body parts moving together. However, when producing force with multiple fingers, the optimal coordination is not to produce similar forces with each finger, but rather for each finger to correct mistakes of other fingers. In this study, we aim to determine whether and how this skill develops in children aged 4-12 years. We measured this sort of coordination using the uncontrolled manifold hypothesis (UCM). We recorded finger forces produced by 60 typically developing children aged between 4 and 12 years in a finger-pressing task. The children controlled the height of an object on a screen by the total amount of force they produced on force sensors. We found that the synergy index, a measure of the relationship between “good” and “bad” variance, increased linearly as a function of age. This improvement was achieved by a selective reduction in “bad” variance rather than an increase in “good” variance. We did not observe differences between males and females, and the synergy index was not able to predict outcomes of upper limb behavioral tests after controlling for age. As children develop between the ages of 4 and 12 years, their ability to produce negative covariation between their finger forces improves, likely related to their improved ability to perform dexterous tasks. |
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| ISSN |
1432-1106 |
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no |
| Call Number |
Shaklai2017 |
Serial |
86 |
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