Second, the median amount of motion and movement is reported, as determined by Cutting et al (2011b).Motion is the optical change created bymoving objects, people, and shadows; movement is that change created by camera motion or gradual lens change (a zoom; see Gibson 1954).We calculated their combination by correlating next-adjacent frames along the length of each film—frames 1&3,2&4,3&5, . . . ,40377&40379, . . . , and so avoided adjacent frames (eg, 1&2, 2&3) because a number of the DVDs we obtained for these films were imperfectly digitized (the 24 frames/s rate in the analog filmwas not synchronized to the sampling rate of the DVD), creating.
