The current study examined how the deployment of spatial attention at the onset of a pointing movement influenced audiovisual crossmodal interactions at the target of the pointing action and at nontarget locations. These interactions were quantified by measuring the susceptibility to the fission (i.e., reporting two visual flashes under one flash and two auditory beep pairings) and fusion (i.e., reporting one flash under two flashes and one beep pairing) audiovisual illusions. At movement onset, unimodal, or auditory and visual bimodal stimuli were either presented at the target of the pointing action or in an adjacent, nontarget location. In Experiment 1, perceptual accuracy within the unimodal and bimodal conditions was lower in the nontarget relative to the target condition. The fission illusion was uninfluenced by target condition. However, the fusion illusion was more likely to be reported at the target relative to the nontarget location. In Experiment 2, the stimuli from Experiment 1 were further presented at a location near where the eyes were fixated (i.e., congruent condition), where the hand was aiming (i.e., target), or in a location where neither the eyes were fixated nor the hand was aiming. The results yielded the greatest susceptibility to the fusion illusion when the visual location and movement end points were congruent relative to when either movement or fixation was incongruent. Although attention may facilitate the processing of unisensory and multisensory cues in general, attention might have the strongest influence on the audiovisual integration mechanisms that underlie the sound-induced fusion illusion.

当前的研究检查了在指向动作开始时空间注意力的部署如何影响指向动作目标和非目标位置的视听交叉模式交互。通过测量对裂变的敏感性（即，在一次闪光和两次听觉哔哔声配对下报告两次视觉闪光）和融合（即在两次闪光和一次哔哔声配对之下报告一次闪光）视听幻象来量化这些相互作用。运动开始时，在指点动作的目标处或在相邻的非目标位置呈现单峰或听觉和视觉双峰刺激。在实验1中，相对于目标条件，非目标条件下单峰和双峰条件下的感知准确度较低。裂变幻觉不受目标条件的影响。但是，相对于非目标位置，更有可能在目标处报告融合错觉。在实验2中，将实验1的刺激进一步呈现在固定眼睛的位置（即一致的状况），手瞄准的位置（即目标）或没有固定眼睛或固定眼睛的位置。手在瞄准。当视觉位置和运动终点一致时，相对于运动或注视不一致时，结果对融合错觉的敏感性最大。