There have been multiple theories regarding divided attention. One, conceived by Kahneman ,  explains that there is a single pool of attentional resources that can be freely divided among multiple tasks. This model seems to be too oversimplified, however, due to the different modalities (., visual, auditory, verbal) that are perceived.  When the two simultaneous tasks use the same modality, such as listening to a radio station and writing a paper, it is much more difficult to concentrate on both because the tasks are likely to interfere with each other. The specific modality model was theorized by Navon and Gopher in 1979. However, more recent research using well controlled dual-task paradigms points at the importance of tasks.  Specifically, in spatial visual-auditory  as well as in spatial visual-tactile tasks  interference of the two tasks is observed. In contrast, when one of the tasks involves object detection, no interference is observed.  Thus, the multi-modal advantage in attentional resources is task dependent.
1/32 F-100D Hun Part 4 SPECIAL LIMITED EDITION AUTOGRAPHED VERSION! MULTIPLE SHEET SET. This Special Version decal set has the instruction sheet autographed by long-time IPMS member Maj Don Schenk, whose "Mary Jane/Carol Ann" is one of the featured schemes! F-100D-50-NH, 55-2901 "Colleen," Lt Joe Vincent, 31 TFW/309 TFS, Tuy Hoa, RVN, Spring 1970 (SEA camouflage scheme); F-100D-25-NA, 55-3604, "skull," Lt Col Harold "Bunny" Comstock, 27 TFW/481 TFS Commander, Bien Hoa, RVN, July 1966 (silver paint scheme); F-100D-20-NA, 55-3580 "Mary Jane/Carol Ann," Maj Don Schmenk, 31 TFW/308 TFS, Late 1969 (SEA camouflage scheme). Comstock’ "skull" jet displays seven iron cross kill symbols from his WW II kills. Schmenk "Mary Ann" includes both early and late versions of the crew data blocks and tail markings. Special thanks to pilots Joe Vincent & Don Schmenk, both IPMS members, for all their help during the creation of this set.