EFFECTS OF PRIORITY ASSIGNMENT OF ATTENTIONAL RESOURCES, ORDER OF TESTING, AND RESPONSE SEQUENCE ON TUNNEL VISION

The effects of relative priority of attentional resources allocated to simultaneous peripheral and foveal tasks, response sequence to the ta sks, and order of testing with two levels of foveal cognitive loading on tunnel vision were studied with 32 Chinese undergraduates. Two leve ls of foveal condition were used for the foveal task while the periphe ral task required a single-target detection. Performance decrement val ue and a significant interaction of levels x eccentricities indicated that tunnel vision was most prominent when the foveal task was primary . Greater magnitude of tunnel vision was obtained when the more diffic ult foveal task was tested prior to the no-foveal-load condition. Resp onding sequence to the tasks was nonsignificant.