Information Technology Reference
In-Depth Information
(A)
(B)
Display
30cm
30q 30q
Speaker
Fig. 2.
(A) Experimental arrangement of the display and speakers. (B) All stimulus types. E.g.
ALs: auditory standard stimulus presented on left side.
1 trial
experiment start
stimuli
stimuli
stimuli
105ms
105ms
105ms
2000ms
600~1000ms
600~1000ms
time
Fig. 3.
Schematic of the trail sequence
As shown in Figure 3, after 2000ms of experiment onset, first stimulus was pre-
sented for 105ms on the left, right or central location. Following a random interstimu-
lus interval of 600-1000ms, another stimulus was presented.
Throughout the experiment, the subjects were required to fixate on a centrally pre-
sented fixation point. The subject's task was to detect all target stimuli anywhere as
quickly and accurately as possible and to respond by pressing the left key of a com-
puter mouse. The subjects were allowed to take a 2-min break between sessions. At
the beginning of experiment, the subjects were given a number of practice trials to
ensure that they understood the paradigm and were familiar with the stimuli.
2.4 Data Analysis
Reaction times (RTs) and hit rates (HRs) for the target stimuli were computed sepa-
rately for each stimulus type and location. The RTs and HRs were analyzed using a
