Although the pixel coordinate of the fixation point
shifts, its direction relative to the reference marker does not change.
In this case, disparity is defined as the vector difference in positions of identified corresponding points in the left and right images, each one measured with respect to the fixation point
as the origin.
These instructions consisted of keeping their gaze on the central fixation point
and pressing the laptop keyboard every time a stimulus was perceived.
On every trial, participants had to carry out one of two different tasks: a) if the fixation point
was an at sign, they had to decide whether the letter was a vowel or a consonant (letter task); b) if the fixation point
was a hash sign, participants had to respond whether the number was odd or even (number task).
Finally, in the Recognition phase the participants saw a centered fixation point
for 500 ms, which was followed by a centered matrix of four words, presented in the same configuration as in the Encoding phase.
For each of the four display designs (Figure 1), the target to be searched was presented for 1500 ms, followed by a 2-s presentation of a fixation point
. After the 2-s presentation of a fixation point
, one of the four types of display was presented to the participant.
At the completion of the simulation, these times form the origination and fixation point
processes whose properties are the primary concern of this paper.
Six baboons and three humans learned to control a cursor on a computer screen with a joystick and to align it with a fixation point
in the center of the screen.
Average sensitivity values for the macular region were calculated on the basis of the total projected stimulus mean value (0-10[degrees] from the fixation point
) and are presented as an average threshold value in decibels (dB).
From the records of eye-tracking instrument, when the fixation point
of test drivers is in the area of the exit direction guide for the first time as shown in Figure 5(a), it is considered that the exit direction guide is recognized.
Each trial of the dot-probe task began with a central fixation point
that was presented at the center of the screen for 500 ms.
This variability may be influenced by the techniques and instruments used to measure it, due to parallax errors, patient care, reading accuracy, and the fixation point
, especially when the millimeter ruler is used .