Lateral interception I: Operative optical variables, attunement, and calibration.

Abstract

) suggested that improvement in perception and action can be attributed in part to changes in which variable is attended to. Such reattunement has been demonstrated with observers making judgments in response to simulations. The present study sought attunement changes in the perception of real events and in visually guided action. In 3 experiments, adults judged the passing distance of or attempted to catch balls. Discrete measures and the predictions of a modified required velocity model (e.g., R. J. Bootsma, V. Fayt, F. T. J. M. Zaal, & M. Laurent, 1997) were used to reveal which variables were exploited. Participants differed from each other and, to some extent, changed in the optical variables used, in catching as well as judging. Nevertheless, the changes were much smaller than in previous simulation-judgment studies; calibration was also found to underlie the improvements in performance.

Adaptations of lateral hand movements to early and late visual occlusion in catching

“…A large part of these studies focused on the predictive control of movement timing (Bootsma and van Wieringen 1990;Fitch and Turvey 1978;Lee et al 1983;McLeod 1987;Savelsbergh et al 1991;Tyldesley and Whiting 1975), while others focused more on the vision-based movement adjustments used to reach the right place at the right time (Brenner et al 1998;Dessing et al 2005;Jacobs and Michaels 2006;Montagne et al 1999;Peper et al 1994;Smeets and Brenner 1995). The present study extends the latter line of research by examining the effects of predictable and unpredictable occlusion on vision-based movement adjustments underlying catching.…”

Lateral interception II: Predicting hand movements.

“…The setting of parameters, which we term calibration in Jacobs and Michaels (2006), must itself be explained. Thus, we do not find it sufficient to show that some model can predict any of several trajectories; a serious test of a model must also show that with the same parameter values, it can Note.˙ϭ the first temporal derivative of the azimuthal angle between the sagittal plane and the center of the ball; ˙ϭ the first temporal derivative of the optical angle of the ball; ␦ ϭ information that specifies ball size; ␣ GO ϭ slope of the GO function.…”

“…Given these doubts, Peper et al's conclusions about the general nature of Figure 1. Top and side views of the lateral interception task developed by Peper et al (1994) and used by Jacobs and Michaels (2006). A ball on a string swings down and passes to the right of the catcher.…”

Transfer of Calibration Between Length and Sweet-Spot Perception by Dynamic Touch

“…We take calibration to bear on the relation between the perceptual information exploited and the subsequent perception or action. More precisely, calibration is the process that establishes and maintains the appropriate relation between the informational variable and the perception or action (e.g., Jacobs & Michaels, 2006;Withagen & Michaels, 2002. In some places, we use the term recalibration to emphasize a change in existing calibration values.…”

“…Calibration in perception-action has received considerable attention lately (e.g., Adolph & Avolio, 2000;Bhalla & Proffitt, 1999;Bingham et al, 2000;Jacobs & Michaels, 2006;Mark, 1987;Pick et al, 1999;Redding & Wallace, 1997a;Wagman et al, 2001;Withagen & Michaels, 2002. Among the issues addressed is the organization of calibration.…”