听觉注意负荷对视听整合的影响

Effects of Auditory Load on Audiovisual Integration

摘要: 由于听觉负荷控制范式的不同，听觉负荷对视听整合影响尚存争议。本研究采用RSVP范式操纵听觉负荷(低负荷、中负荷、高负荷)，通过设置0%、30%和70%三种干扰刺激同时呈现比例考察不同负荷对视听整合的影响。结果发现，除视觉通道下高负荷反应时显著低于低负荷外，其余通道不同负荷间反应时、击中率均无显著差异；不同负荷间视听结合较单独视、听觉反应时更低、击中率更高；竞争模型进一步研究表明，低负荷下发生视听整合效应(p < 0.05)，中负荷下视听整合时程缩短、峰值降低、窗口期提前，高负荷下未发生视听整合。结果表明，视听整合效应受听觉负荷影响显著，随负荷增加而降低直至消失。

Abstract: The effect of auditory load on audiovisual integration is still controversial due to the different auditory load control paradigms. To clarify the impact of auditory load on audiovisual integration, the RSVP paradigm was used to manipulate the auditory load in this study (low load, medium load, high load), and three kinds of interference stimulus presentation ratios of 0%, 30% and 70% were presented to investigate the effects of these on the audiovisual integration. The results showed that there were no significant differences in response time and hit rate between different loads in visual and auditory channels; except that the response time under high load was significantly lower than that under low load in visual channel. The response time of audiovisual was lower than that of visual and auditory alone, but the hit rate, under different load. A further study of Race model shows that audiovisual integration effect occurs under low load (p < 0.05), and the duration of audiovisual integration was shortened, the peak value was reduced, of course the window period was advanced under medium load. Under high load, no audiovisual integration occurred. The results showed that the audiovisual integration effect was significantly affected by the auditory load, and decreased until disappeared with the increase of the auditory load.