The effect of spatial–temporal audiovisual disparities on saccades in a complex scene Export

@article{citeulike:4494494, abstract = {Abstract\ \ In a previous study we quantified the effect of multisensory integration on the latency and accuracy of saccadic eye movements toward spatially aligned audiovisual (AV) stimuli within a rich AV-background (Corneil et\ al. in J Neurophysiol 88:438–454, 2002). In those experiments both stimulus modalities belonged to the same object, and subjects were instructed to foveate that source, irrespective of modality. Under natural conditions, however, subjects have no prior knowledge as to whether visual and auditory events originated from the same, or from different objects in space and time. In the present experiments we included these possibilities by introducing various spatial and temporal disparities between the visual and auditory events within the AV-background. Subjects had to orient fast and accurately to the visual target, thereby ignoring the auditory distractor. We show that this task belies a dichotomy, as it was quite difficult to produce fast responses (\<250\ ms) that were not aurally driven. Subjects therefore made many erroneous saccades. Interestingly, for the spatially aligned events the inability to ignore auditory stimuli produced shorter reaction times, but also more accurate responses than for the unisensory target conditions. These findings, which demonstrate effective multisensory integration, are similar to the previous study, and the same multisensory integration rules are applied (Corneil et\ al. in J Neurophysiol 88:438–454, 2002). In contrast, with increasing spatial disparity, integration gradually broke down, as the subjects' responses became bistable: saccades were directed either to the auditory (fast responses), or to the visual stimulus (late responses). Interestingly, also in this case responses were faster and more accurate than to the respective unisensory stimuli.}, author = {Van Wanrooij, Marc and Bell, Andrew and Munoz, Douglas and Van Opstal, A.}, citeulike-article-id = {4494494}, citeulike-linkout-0 = {http://dx.doi.org/10.1007/s00221-009-1815-4}, citeulike-linkout-1 = {http://www.springerlink.com/content/r4304t37m0630016}, day = {1}, doi = {10.1007/s00221-009-1815-4}, journal = {Experimental Brain Research}, keywords = {accuracy, auditory, causal\_inference, latency, orienting, visual}, month = {September}, number = {2}, pages = {425--437}, posted-at = {2009-08-31 09:58:27}, priority = {4}, title = {The effect of spatial–temporal audiovisual disparities on saccades in a complex scene}, url = {http://dx.doi.org/10.1007/s00221-009-1815-4}, volume = {198}, year = {2009} }

TY - JOUR ID - citeulike:4494494 L3 - citeulike-article-id:4494494 N2 - Abstract  In a previous study we quantified the effect of multisensory integration on the latency and accuracy of saccadic eye movements toward spatially aligned audiovisual (AV) stimuli within a rich AV-background (Corneil et al. in J Neurophysiol 88:438–454, 2002). In those experiments both stimulus modalities belonged to the same object, and subjects were instructed to foveate that source, irrespective of modality. Under natural conditions, however, subjects have no prior knowledge as to whether visual and auditory events originated from the same, or from different objects in space and time. In the present experiments we included these possibilities by introducing various spatial and temporal disparities between the visual and auditory events within the AV-background. Subjects had to orient fast and accurately to the visual target, thereby ignoring the auditory distractor. We show that this task belies a dichotomy, as it was quite difficult to produce fast responses (<250 ms) that were not aurally driven. Subjects therefore made many erroneous saccades. Interestingly, for the spatially aligned events the inability to ignore auditory stimuli produced shorter reaction times, but also more accurate responses than for the unisensory target conditions. These findings, which demonstrate effective multisensory integration, are similar to the previous study, and the same multisensory integration rules are applied (Corneil et al. in J Neurophysiol 88:438–454, 2002). In contrast, with increasing spatial disparity, integration gradually broke down, as the subjects’ responses became bistable: saccades were directed either to the auditory (fast responses), or to the visual stimulus (late responses). Interestingly, also in this case responses were faster and more accurate than to the respective unisensory stimuli. IS - 2 JF - Experimental Brain Research EP - 437 TI - The effect of spatial–temporal audiovisual disparities on saccades in a complex scene VL - 198 SP - 425 KW - accuracy KW - auditory KW - causal_inference KW - latency KW - orienting KW - visual AU - Van Wanrooij, Marc AU - Bell, Andrew AU - Munoz, Douglas AU - Van Opstal, A PY - 2009/09/01/ UR - http://dx.doi.org/10.1007/s00221-009-1815-4 ER -