Search Results - "Hamstra, S.J."

Comparative Effectiveness of Virtual Reality Versus Box Trainer Simulators for Laparoscopic Surgery Training: A Systematic Review & Meta-Analysis by Zendejas, B, Cook, D.A, Brydges, R, Hamstra, S.J, Bingener, J

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QS439. Getting Agreement Among Surgeons About Error: A Statistical Problem by Arble, E, Gauger, P.G, Minter, R.M, Hamstra, S.J, Hauge, L.S

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Interpretation of three-dimensional structure from two-dimensional endovascular images: implications for educators in vascular surgery by Sidhu, R.S., Tompa, D., Jang, R., Grober, E.D., Johnston, K.W., Reznick, R.K., Hamstra, S.J.

“…Endovascular therapy has had a major effect on vascular surgery; surgeons perform tasks in three dimensions (3D) while viewing two-dimensional (2D) displays…”
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Dissociation of discrimination thresholds for time to contact and for rate of angular expansion by Regan, D, Hamstra, S J

“…It is well known that, if a rigid sphere is moving at constant speed towards the eye along the line of sight then, for small values of theta, T = theta/theta,…”
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Can teamwork and situational awareness (SA) in ED resuscitations be improved with a technological cognitive aid? Design and a pilot study of a team situation display by Parush, A., Mastoras, G., Bhandari, A., Momtahan, K., Day, K., Weitzman, B., Sohmer, B., Cwinn, A., Hamstra, S.J., Calder, L.

“…[Display omitted] •A large situation display can support teamwork.•The display should integrate all high-priority information critical to all team members.•The…”
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Laboratory based training in urological microsurgery with bench model simulators: a randomized controlled trial evaluating the durability of technical skill by Grober, Ethan D, Hamstra, Stanley J, Wanzel, Kyle R, Reznick, Richard K, Matsumoto, Edward D, Sidhu, Ravindar S, Jarvi, Keith A

“…We evaluated the durability of laboratory based technical skills training in urological microsurgery using bench model simulators. A total of 50 junior surgery…”
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Shape discrimination and the judgement of perfect symmetry: dissociation of shape from size by Regan, D, Hamstra, S J

“…We measured the accuracy with which subjects judged that a square or circle was perfectly symmetrical i.e. that aspect ratio (a/b) was exactly unity (where a…”
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Unemployment in an underserviced specialty?: The need for co-ordinated workforce planning in Canadian neurosurgery by Woodrow, S I, O'Kelly, C, Hamstra, S J, Wallace, M C

“…A recent report suggested that newly trained Canadian neurosurgeons are experiencing difficulty finding employment in Canada. Such occurrences, in combination…”
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Evidence for a neural mechanism that encodes angles by Regan, D., Gray, R., Hamstra, S.J.

“…We measured the discrimination threshold (Δθ) Th for angle θ, where θ was either the angle of a Vee composed of two straight lines contained within the…”
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The joint contributions of saccades and ocular drift to repeated ocular fixations by Hamstra, S.J, Sinha, T, Hallett, P.E

“…We measured the joint contributions of different sized saccades and ocular drift to overall performance in an alternating fixation task. Subjects repeatedly…”
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Shape discrimination for rectangles defined by disparity alone, by disparity plus luminance and by disparity plus motion by Regan, D, Hamstra, S J

“…We measured the just-noticeable difference in aspect ratio a/b for dotted rectangles defined entirely by disparity (DD rectangles), dotted rectangles defined…”
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Dissociation of orientation discrimination from form detection for motion-defined bars and luminance-defined bars: effects of dot lifetime and presentation duration by Regan, D, Hamstra, S J

“…A stationary bar-shaped area that was perfectly camouflaged within a dot pattern was rendered visible by moving the dots inside and outside the bar at equal…”
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Orientation discrimination in cyclopean vision by Hamstra, S J, Regan, D

“…Using a dynamic random-noise display we measured orientation discrimination threshold for two kinds of cyclopean bar and for a cyclopean edge. Ocular vergence…”
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Nonlinearities in the visual processing of motion and form by Regan, D., Hamstra, S.J., Xiang-Hua Hong, Kaushal, S.

“…Hoyle (1957) showed that, for a rigid sphere moving along the line of sight at constant speed, time to collision is approximately equal to the ratio /spl…”
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