Within many animal species, individuals exhibit different personalities. For example, some individuals are consistently more than others.
"But in biology, we still do not fully understand what is behind the fact that people or animals exhibit different personalities. In people, people with different levels of signal substances in the brain, such as serotonin or dopamine tend to behave differently, but we do not know whether fluctuations in these signal substances can explain differences in personality in other species, and if the signal substances cause the observed differences, or whether the differences in behavior and signal signal levels depend on another factor, says Robin Abbey-Lee, a postdoctoral in the Department of Physics, Chemistry and Biology, IFM, one of the researchers who led the study .
Give people particles of medicine
So researchers wanted to change the levels of serotonin and dopamine signal agents to investigate this, and use cricket for the study. They did so by putting cricket drugs affecting the serotonin and dopamine systems, and that they used to treat people in depression or Parkinson's disease. Because the serotonin and dopamine systems of different animals were similar to each other, researchers were expecting the drugs to also affect cricket.
"In this study, we wanted to gain an important information gap by significantly changing the levels of these signal substances and seeing that could lead to changing behavioral behavior in quays," said Hanne Løvlie, an Assistant Professor in IFM, who has studied study.
Then he measured cricket behaviors
The researchers measured three different behavior in the chests.
"We measured what active crickettes are in a familiar environment. It corresponds to how much a person moves around in their own home. We also investigated the exploratory behavior of the cricket in a new environment, similar to how it can a person to behave in a visit to a new city. Finally, we studied how the crickets were acting in a fighting situation to measure the aggressive individuals, says Robin Abbey-Lee.
The researchers found that changing serotonin levels make the cricket less active and less aggressive. Dopamine levels did not change, on the other hand, related to behavioral changes in the chests.
"This shows that serotonin has a clearer basic role in these behaviors," said Hanne Løvlie.
The perceptions increase our understanding of why personality has a personality. They also raise the issue of how drugs that discharge to nature through our wastewater affect wildlife.
"Experimental treatment of monoamin levels changes personality in crickets", Abbey-Lee RN, Uhrig Uhrig, Garnham L, Lundgren K, Child S, LøvlieH, (2018), Scientific Reports, published online November 1, 2018