Dating agency foot tickling
That frequency is too high for humans to hear, so the researchers transposed the vocalizations to lower frequencies.
(Notably, none of the tickles caused rats to make utterances in the 22-k Hz range, which are considered “alarm calls,” according to the study.)In addition to the vocalizations, the rats also reacted to tickles with spontaneous Freudensprünge jumps.
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Ishiyama and Brecht outlined some of their own questions. Next, the researchers tickled the rats on their tails. Each part of the routine lasted for about 10 seconds, followed by a 15-second break.
The rats responded with ultrasonic vocalizations in the range of 50 kilohertz, a pitch with a “positive emotional valence,” according to the study.
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In the article “Anatomy of a Tickle Is Serious Business at the Research Lab,” evolutionary biologist Richard Alexander explains, “[T]icklish laughter is not the happy phenomenon that many have assumed it to be […] A child can be transformed from laughter into tears by going the tiniest bit too far […] [Tickling] does not create a pleasurable feeling — just the outward appearance of one.” Historically, many cultures capitalized on tickling’s ability to cause pain.