Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Previous studies usually used the instruction to control the attention of the participants to different spatial locations to investigate the influence of endogenous spatial attention on the audiovisual integration, which found that endogenous spatial attention enhanced audiovisual integration. However, in reality, it is difficult to assign attention in an all-or-none manner. In present study, we used endogenous spatial cue-target paradigm to investigate the effect of endogenous spatial cue validity on audiovisual integration.The current study was a 2 (cue validities: valid, invalid) � 3 (target modalities: visual, auditory, audiovisual) factorial design. A total of 62 undergraduate students were recruited as paid volunteers. Experiment 1 recruited 35 participants (5 males; age range: 18~26 years; mean age: 21.26 � 1.77 years). Experiment 2 recruited 27 participants (6 males; age range: 19~25 years; mean age: 22.19 � 1.75 years). The visual (V) target was a white pentagonal asterisk block (2白2�). The auditory (A) target was a 1600 Hz sinusoidal tone presented by speakers. The audiovisual (AV) target was composed by the simultaneous presentation of both the visual and the auditory stimuli. At the beginning of each trial, the fixation stimulus was presented for 600~800 ms in the center of the monitor. Following the fixation stimulus, the cue was presented for 200 ms, which could predict (50% or 80%) the location of the target. Before the target that appeared for 100 ms, the inter stimulus interval (ISI) lasted for 700 ms. The target (A, V, or AV) randomly appeared for 100 ms in the left or right locations. At last, the fixation stimuli appeared for 600 ms to wait for the correspondence responses to targets. During the experiment, the participants were asked to locate targets by pressing buttons (F/J) as quickly and accurately as possible. The results showed that the responses to AV targets were faster than V or A targets, indicating the appearance of the bimodal advancement effect in both experiments. Each target modality showed significant cueing effect. And the cueing effect in experiment 2 was significantly larger than the cueing effect in experiment 1. In addition, in experiment 1, relative multisensory response enhancement (rMRE), race model (probability difference) showed no significant difference at valid compared to invalid locations. However, in experiment 2, rMRE and race model (probability difference) increased at valid compared to invalid locations. The results suggested that endogenous spatial attention enhanced audiovisual integration in high spatial validity condition. In summary, Endogenous spatial attention had different effects on the audiovisual integration under different spatial cue validity. High spatial cue validity enhanced audiovisual integration. The current study provides direct behavioral evidence for endogenous spatial attention to enhance audiovisual integration.
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