After all tasks were classified into aimed, no aimed and not executed (children refused to continue or did not execute the test as requested), the analysis of eye gaze movement was executed to find out how the motivation changes the eye gaze slope in Fitts' law. This was done analysing the eye gaze movement logs.
To analyse eye gaze slope, according to Fitts' law we took all data of eye movement from any source area (blank area or another picture) to the target area (picture of movie scene).
(This, strictly speaking, violates Fitts' law's basic assumption that subjects move toward a target with maximum velocity.
An evaluation protocol based on Fitts' law such as the one we developed in this study has general applicability for researchers as well as practitioners.
The present study employed Fitts' law to describe and test the effects of droplines on target acquisition movements within a 3-D perspective display,.
In addition to measuring the movement time to acquire targets for Fitts' law analyses, the present experiment also examined participants' dimensional coordinative strategies.
How should Fitts' law be applied to human-computer interaction?
A method for evaluating head-controlled computer input devices with Fitts' law. Human Factors, 32.
Beyond Fitts' law
: Models for trajectory-based HCI tasks.
Hoffmann (1992) used Fitts' law to predict the effects of lags on target-directed movement times with manually controlled pointers.
Regression lines fitting Fitts' law to movement times with constant lag will meet at a single point (the y intercept, a, when [log.sub.2](2D/W) = 0; see Equation 1) and their gradients (b (c + lag); see Equation 1) will increase with increasing lags.
Andres and Hartung (1989) showed that head movement could be described using Fitts' law
for a tapping task involving a chin stylus.