This paper (16 page PDF) describes two experiments investigating "whether viewing instructions (i.e. rating task vs. viewing task) and the availability of a pause button affect learners' knowledge acquisition with educational videos." The results were inconclusive regarding the first point, but on the second, "the inclusion of a pause button increased learning for the older participants, but learning outcomes of younger participants were unaffected." As usual, the study was so small and unrepresentative no generalizations can be made, though the authors suggest " age is introduced as a potential boundary condition that should be investigated in instructional design research." I'm not sure 'introduced' is exactly the right word here.
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