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Video is a form of multimedia that conveys information through two
simultaneous sensory channels: aural and visual. It often uses multiple presentation
modes, such as verbal and pictorial representations in the case of on-screen print and
closed-captioning (Mayer, 2001). This multiplicity means that video communicates the
same information to students through simultaneous learning modalities and can provide
students with “multiple entry points” (Gardner, 2006) into the content:
The richness of these forms of information [images, motion, sound, and, at times,
text] benefits learners, by enabling them “…to learn through both verbal and
visual means, to view actual objects and realistic scenes, to see sequences in
motion, and to view perspectives that are difficult or impossible to observe in real
life” (Wetzel, 1994). …[M]ost researchers agree that “…when viewed together,
each source provides additional complementary information,” thus increasing the
chances that comprehension will take place (Kozma, 1991).” (CPB, 2004, p.5)
Citing Wood (1995), Aiex (1999) notes that video can be used “to promote
awareness of the interrelationship between modes (picture, movement, sound, captions)”
(p. 2). Kozma (1991) found that the mix of spoken language, text, still images and
moving images in television and video results in higher learning gains than media that
rely primarily on only one of these symbol systems. Wetzel et al.’s 1994 review of
research concluded that combining sound with either still or moving images resulted in
more learning than simply adding motion to still images (cited in CPB, 2004).
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