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* ball falling from ceiling McLeod:
* ball falling from ceiling McLeod:
* <cite>McLeod-1987</cite> need this one
* <cite>McLeod-1987</cite> need this one

Revision as of 21:47, 28 September 2008


Alex Holcombe
Sarah McIntyre
Fahed Jbarah
• Shih-Yu Lo
• Patrick Goodbourn
Lizzy Nguyen

action precision
Tactile Motion
Tactile Receptors
Binding, grouping


Skills Checklist
Python Programming
Psychopy/VisionEgg Installation Notes
R analysis,plot,stats
Buttonbox with photocell
Programming Cheat Sheets

  • cricket:[1, 2]: They explored the shot called "back leg glance" in which the trajectory of the ball is perpendicular to the trajectory of the bat. In that way, they can calculate precision just by considering the width of the bat. The temporal resolution of best cricket players is 2 ms. For normal subjects is about 5-10 ms. They think that the precision is not qualitatively different. How can this temporal resolution be achieved? Hopkins and Kristofferson[1, 2] required subjects to generate a time interval by trying to press a button at a precise time after a light went on. After 70000 trials the sd was 76 ms!

  • ping-pong [3] "managed to get 75% of the balls, on average, into the target area. Because the target had a diameter of 55 cm and was located some 2.5 m away from the point of contact (near the leading edge of the table), this implies that at least 75% of the balls have been contacted with the direction of travel of the bat not varying more than 6° around the line through the center of the target. Assuming a normal distribution, the standard deviation of the direction of travel of the bat at the moment of contact must have been therefore 5.2°. As seen later, angular bat velocities at contact of 800°/s are quite common, which means that the players have to time their moment of contact with a precision of, at maximum, 5.2/0.800 = 6.5 ms"

  • ball falling from ceiling McLeod:

  • [4] need this one


  1. Bootsma RJ, van Wieringen PCW. Timing an attacking forehand drive in table tennis. Journal of Experimental Psychology: Human Perception and Performance. 1990;16:21 [Bootsma-Wieringen-1990]
  2. McLeod P. Visual reaction time and high-speed ball games" Perception 1987; 16(1) 49 – 59 [McLeod-1987]
  3. McLeod P and Jenkins S. Timing accuracy and decision time in high-speed ball games. International Journal of Sport Psychology 1991; 22 279-295. [McLeod-Jenkins-1991]
  4. Ultrastable stimulus-response latencies: acquisition and stimulus control. Perception and psychophysics, 27, 241-250. [Hopkins-Kristofferson-1980]
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