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Subscription-only access to children's content is now common with services like those from Disney (www.preschooltime.com) and Nick Jr. (www.mynoggin.com), but Kids Play signals a new path for a nonprofit like PBS, said Benjamin Grimley, the senior director for PBS Interactive Businesses.
Ethologists call these ways "play signals".
The oldest play signals in humans are smiling and laughing.
In the anthropoid apes, play signals are visual and auditory.
According to ethologists, these evolved from similar play signals in pre-human apes.
Typical attention getters included barks, play bites, and bumps, which are easy to distinguish from play signals, such as running off while looking back, and exaggerated, loping approaches.
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McNair perused the Giants' defense and immediately changed the play, signaling teammates with a gesture of his left hand.
In this play, dogs follow a basic code of behavior: do not bite too hard or before sending a "play signal," or your playmate will respond with aggression.
The hypothesis that laughter evolved as a play signal is appealing in several ways.
If the dogs had no theory of mind, she says, they would play signal even to dogs that could not see it.
Ed Hochuli blew his whistle during the play, signaling that the play was dead and ruling an incomplete pass.
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