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left
right
center
100
90
80
70
60
V
A
VA
Modality
Fig. 5.
Hit
Rates of V, A and VA stimuli on left, right and central locations (* p < 0.05, ** p <
0.001)
4 Discussion
We found the enhancement of RTs and HRs to response the unimodal V stimuli on
central spatial location than on peripheral spatial locations. This enhancement attrib-
ute to the difference of the cell structure in the retinae. Some neuroanatomy studies
showed that the Pβ ganglion cells in the retinae dominate at the fovea and there is a
decrease in the ratio of Pβ to Pα ganglion cells with increasing retinal eccentricity,
the central parts of the retina is particularly sensitive to contrast, high spatial fre-
quency and colour, but the peripheral parts of the retina is possesses a high temporal
resolution [15,16].
No difference in the RTs and HRs response to unimodal auditory stimuli was
found on between central spatial location and peripheral spatial locations. This results
supported that spatial perception in the auditory system were relatively stolid [7, 10].
The responses to VA target stimuli were faster than those to unimodal V target
stimuli and unimodal A target stimuli on each of three spatial locations (left, right,
and central). This finding is consistent with some previous studies, and supported that
the multisensory audiovisual information speeded reaction times [3, 4, 5]. Moreover,
the RTs to responses the VA target stimuli presented on central spatial locations was
shorter than that presented on peripheral spatial locations. This supports the hypothe-
sis that the spatial location of presented stimuli affected audiovisual interaction.
In addition, we did not found HRs enhancement between unimodal A stimuli and
multimodal VA stimuli. And the HRs to response the unimodal A stimuli was above
90%. We speculated that it is enough to subjects to detect the VA stimuli only
