Figure 1.
Typical display for the visual search task.
Sixteen Gabor patches appeared on the screen. Half of the trials contained a target, which was defined by the combination of orientation and spatial frequency. In this display, the target has a high spatial frequency and is oriented counter-clockwise. It is located at second-row and second-column. The position of the target and the distracters were randomized between trials.
Figure 2.
Learning curve of the conjunction search task.
Reaction time in seconds as a function of training day is plotted. Filled red squares denote the data when the target is presented. Blank blue squares denote when the target is absent. The data from 12 subjects are averaged. Error bars represent ±1SEM.
Figure 3.
Normalized pupil diameter as a function of time.
(A) Each function represents the averaged pupil diameter of 12 subjects during the conduction of the visual conjunction search task. The data in each trial was normalized relative to the pupil size during the cross fixation period immediately preceding the trial. Different functions denote the different training day: 1st, 3rd, 5th, and 10th day, respectively. (B) Each function represents the averaged pupil diameter of 12 subjects conducting the passive viewing task. In passive condition subjects observed the visual search display, but no task was imposed. The data in each trial was normalized relative to the pupil size during the cross fixation period immediately preceding the trial. Different functions denote the different experimental day: 1st, 3rd, 5th, and 10th day, respectively.
Figure 4.
Normalized average pupil diameter as a function of the training day.
Filled squares denote the averaged pupil diameter of 12 subjects conducting the visual conjunction search task. In the passive condition (blank triangles), subjects observed the same display but no task was imposed. The data was calculated from Fig. 3. Error bars represent ±1SEM.
Figure 5.
Normalized pupil diameter 1 second after the onset of the visual search display.
Filled squares denote the averaged pupil diameter of 12 subjects 1 second after the onset of the visual search display, as a function of the training day. The data was calculated from Fig. 3(A). Error bars represent ±1SEM.