Chapter 7 Flashcards
manual aiming skills
motor skills that involve arm, hand, and/or finger movement to a target;
speed-accuracy trade-off
a characteristic of motor skill performance in which the speed at which a skill is performed is influenced by movement accuracy demands; the trade-off is that increasing speed yields decreasing accuracy, and vice versa
Fitts’ law
a human performance law specifying the movement time for an aiming movement when the distance to move and the large size are known.
index of difficulty (ID)
according to Fitts’ law, a quantitative measure of the difficulty of performing a skill involving both speed and accuracy requirements;
prehension
action of reaching for and grasping an object the may be stationary or moving
motor equivalence
the capability of the motor control system to enable a person to achieve an action goal in a variety of situations and conditions (writing your signature with either hand)
adapt to various context demands
bimanual coordination
a motor skill that requires the simultaneous use of the 2 arms
skill may require the 2 arms to move with the same or different spatial and/or temporal characteristics
speed and accuracy have what type of a relationship
indirect,
trade-off between emphasizing one over the other
open-loop control
immediate reaction, no feedback taken into consideration
speed
closed-loop control
takes feedback into consideration (proprioceptive, visual, etc)
(accuracy)
3 phases of visual movement
preparation, initial flight, termination
preparation phase
assess regulatory conditions of environmental context
initial flight phase
monitor limb displacement and velocity
shift gaze to keyhole at 50% time-to-contact
termination phase
provide spatial-temporal info to correct movement accuracy error to ensure insertion of key
Transport
Movement of the hand to the object
