In addition, HDMI® up-scaling even improves the picture and sound quality of standard definition DVDs by optimizing playback signals to 1080p.
Behavioral responses to playback were assessed independently for each trial using the following behavioral scale: 1: the tested bird answered vocally to playback signals and approached at less than 10 meters from the loudspeaker, 2: the tested bird answered vocally but did not approach, 3: the tested bird showed no reaction to playback.
Roberts et al. (2007) report one of the few experimental tests of this in a multimodal system: they measured predatory response rates of jumping spiders to playback of signals from their prey, wolf spiders, and found that multimodal signals elicited faster predatory responses than did unimodal signals.
During playback the signals were read out with a low-power laser that was focused by a lens to form a tiny spot on the disc.
During playback the signals are read out with a low-power helium-neon laser that is focused by a lens to form a tiny spot on a disc.
We, the audience, then watch the couple speeded up with the time code ticking away as they toss and turn until the replay slows down to playback speed, signalling something scary is about to happen.
When we tried to playback the condensed signal at half the normal rate, a quality-degraded version of the original was output.
We therefore predicted greater habituation in experiments where the rate of signal playback was increased.
Repeated playback of this signal (experiment 2) stopped animals eating and elicited a greater number of flights, with animals moving out of the area.
These products have been largely ineffective, presumably because they generate signals outside kangaroo's optimum hearing range [17], [20] and perhaps because of the continuous nature of the signal playback (promoting habituation).
