Word: stimuli
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Initial experiments concluded that direct injection of the two amines did not, however, affect the muscles in different ways. Instead, they "primed" the muscles, and made them more responsive to stimuli, Weiger said...
...There is evidence, and we believe, that response in the brain to stimuli can trigger this," Kirby said, while emphasizing that the exact mechanism behind the fatal attack is not well known...
...research conducted by Kirby and her co-workers, which involves animal rather than human subjects, they are trying to find out how stress hormones, such as the neural hormone norepinephrine, released from nerve endings in response to certain stimuli, affect the functioning of the heart...
...What we discovered after 15 years of work," Kagan said, "is that 15 percent of those children we studied inherited the biological trait of being inhibited." According to Kagan, these children were characterized, at four months of age, by being very reactive to the stimuli of his tests, crying and tensing their limbs...
...thirds of the children that exhibited an early tendency of shyness carried this tendency to the age of two years, showing "high motor activity to stimuli." According to Kagan, these children will be "cautious, shy and restrained...