 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 oversimplified, however, due to the different modalities (e.g., 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.