James E. Cutting has done a number of studies on this topic in the movie domain. Take a look at ["Shot Durations, Shot Classes, and the Increased Pace of Popular	Movies"][1] (Cutting, 2015):

>"The pace of popular movies has	increased and statements about	this trend can be found in both the popular media and	in	scholarly works (see, for example, Bordwell and Thompson 2004;	Bordwell,	Staiger, and Thompson 1985;	Cutting, Brunick, DeLong, Iricinschi, and Candan 2011b; Salt 2006, 2009)"

>"...	shorter	shot durations make for	more cuts, which in	turn make for	
more intensified demands on viewers’ attention."



More work can be found here:
http://people.psych.cornell.edu/~jec7/pictures_film.htm

  [1]: http://people.psych.cornell.edu/~jec7/pubs/cutting&candanProj15.pdf