Hearing range 60 decibels, the hearing range for the Senegal bushbaby is 92 Hz–65 kHz, and 67 Hz–58 kHz for the ring-tailed lemur. Of 19 primates tested, the Japanese macaque had the widest range, 28 Hz–34.5 kHz, compared with 31 Hz–17.6 kHz for humans. Cats have excellent hearing and can detect an extremely broad range of frequencies. They can hear higher-pitched sounds than humans or most dogs, detecting frequencies from 55 Hz up to 79 kHz. Cats do not use this ability to hear ultrasound for communication but it is probably important in hunting, since many species of rodents make ultrasonic calls.
Above the Influence and increases in the perceptions that others use marijuana." In 2011, Ohio State University released the results of an independent scientific study stating that the "Above the Influence" campaign appears to have effectively reduced marijuana use by teenagers. "Evidence for the success of "Above the Influence" is especially heartening because the primary independent evaluation of its predecessor campaign, 'My Anti-Drug', showed no evidence for success", said Michael Slater, principal investigator of the new study and professor of communication at Ohio State University. "The 'Above the Influence' campaign appears to be successful because it taps into the desire by teenagers to