| Records |
| Author |
Liebermann, D.G.; Franks I.M. |
| Title |
Video-feedback and information technologies |
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Book Chapter |
| Year |
2008 |
Publication |
Essentials of notational analysis |
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E & FN Spon Pub |
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I.M. Franks; M. Hughes |
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48 |
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| Author |
Goodman, D.; Liebermann, D.G. |
| Title |
Time-to-contact as a determiner of action: vision and motor control |
Type |
Book Chapter |
| Year |
1992 |
Publication |
Vision and Motor Control |
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Pages |
335-349 |
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Elsevier Pub. Co |
Place of Publication |
Amsterdam, Holland |
Editor |
D. Elliott; J. Proteau |
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43 |
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Liebermann, D.G.; Berman, S.; Weingarden H.; Levin, M.F.; Weiss, P.L. |
| Title |
Kinematic features of arm and trunk movements in stroke patients and age-matched healthy controls during reaching in virtual and physical environments |
Type |
Conference Article |
| Year |
2009 |
Publication |
Virtual Rehabilitation International Conference |
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179-184 |
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Motor performance of stroke patients and healthy individuals was compared in terms of selected kinematic features of arm and trunk movements while subjects reached for visual targets in virtual (VR) and physical (PH) environments. In PH, the targets were placed at an extended arm distance, while in VR comparably placed virtual targets were presented via GestureTek's IREX system. Our goal was to obtain further insights into research methods related to VR-based rehabilitation. Eight right-hemiparetic stroke patients (age =46-87 years) and 8 healthy adults (age =51-73 years) completed 84 reaching movements in VR and PH environments while seated. The results showed that arm and trunk movements differed in the two environments in patients and to a lesser extent in healthy individuals. Arm motion of patients became jerkier in VR, with larger paths and longer movement durations, and presented greater arm torsion (i.e., larger elbow rotations around the hand-shoulder axis). Interestingly, patients also showed a significant reduction of compensatory trunk movements during VR reaching. The findings indicate that when targets were perceived to be beyond hand reach, stroke patients may be less able to estimate 3D virtual target locations obtained from the 2D TV planar displays. This was not the case for healthy participants. |
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52 |
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| Author |
Liebermann, D.G.; Raz, T.; Dickinson, J. |
| Title |
On Intentional and Incidental Learning and Estimation of Temporal and Spatial Information |
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Journal Article |
| Year |
1988 |
Publication |
Journal of Human Movement Studies |
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15 |
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191-204 |
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54 |
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Liebermann, D.G.; Ben-David, J.; Schweitzer, N.; Apter, Y.; Parush, A. |
| Title |
A field study of braking reactions during driving I: Triggering and modulation |
Type |
Journal Article |
| Year |
1995 |
Publication |
Ergonomics |
Abbreviated Journal |
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38 |
Issue |
9 |
Pages |
1894-1902 |
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The present experiment was carried out to explore the response of driving subjects to emergency braking. The field trial consisted of driving behind a leading vehicle while the following drivers' responses were recorded by telemetry. A group of 51 individuals performed a series of trials at two driving speeds (60 and 80km/h), two following distances (6 and 12 m), and two braking conditions (real and dummy braking). Not all of these subjects completed all conditions or the minimum number of trials. The dependent variables were the total braking time (TBT) and its subcomponents: braking reaction time (BRT), and accelerator-to-brake movement time (MT). These data were analysed in three separate three-way ANOVAs with repeated measures on all factors. The results showed that when subjects were not aware of the forthcoming braking, the distance and braking conditions had major effects on all dependent variables. At the shorter following distance drivers reacted and moved faster. Similarly, when the brakes were real compared with dummy (i.e. brake lights only) drivers reacted faster. In addition, drivers reacted to onset of brake lights in 83% of the cases when dummy braking was applied, compared with 97% when real brakes were applied. Speed of driving did not show any significant effects and did not appear to influence the cognitive or attentional set to anticipate an emergency manoeuvre. These findings suggest that changes in angular velocity during optic expansion of the leading vehicle may be used as a cue to modulate braking movement, while onset of brake lights alone may be enough to trigger a ‘ballistic’ preventive response. |
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