Within many animal species, people exhibit different personalities. For example, some people are consistently more daring than others.
"But in biology we still do not understand what lies behind the fact that people or animals exhibit different personalities." In humans, people with different levels of brain signaling materials, such as serotonin or dopamine, tend to behave differently. Can explain differences in personality in other species, and whether signal materials cause observed differences, or if differences in behavior and level of signal materials depend on another underlying factor, says Robin Avi-Lee, a postdoctoral fellow in the Department of Physics, Chemistry and Biology.
Give the crickets medicine to humans
The researchers then wanted to actively alter the levels of serotonin and dopamine to signaling agents to investigate, and used crickets for research. They did this by providing cricket drugs that affect the serotonin and dopamine systems, and used to treat people who are depressed or Parkinson's disease. Because the serotonin and dopamine systems of different animals are similar to each other, the researchers expected that drugs would also affect crickets.
"In this study, we wanted to achieve an important knowledge gap by modifying the experimental levels of these signal materials and see if it could induce behavioral change in the cysts," says Hannah Løvlie, assistant professor at IFM, who studied the study.
Then he measured the behaviors of the cricket
The researchers measured three different behaviors in cysts.
"We measured how active the crickets were in a familiar environment, how many people were walking in their own homes, and how the crickets behaved in a combat environment to measure aggression Of people, says Robin Avi Lee.
The researchers found that altering serotonin levels made crickets less active and less aggressive. Dopamine levels, however, were not associated with behavioral changes in cysts.
"This indicates that serotonin plays a more prominent role in these behaviors," says Hannah Lovley.
The findings increase our understanding of why animals have personality. They also raise the issue of how drugs leak into nature through our effluents affecting wildlife.
"Experimental manipulation of monoamine levels changes the personality of crickets," Abbey-Lee RN, Uhrig EJ, Garnham L, Lundgren K, Child S, LøvlieH, 2018, Scientific Reports, online online November 1, 2018