sentences:  He also did research into frame rate, running a series of tests with 35 mm stock filmed and projected at various speeds, shown to audiences who were instrumented to biometrically test their responses.He found that as the frame rate increased, so did the viewer's emotional reaction.Trumbull theorized that although viewers see smooth motion from film displayed at 24 frames per second, the standard for decades, they are subconsciously aware of the flicker, which reduces the film's emotional impact.