Within many animal species, individuals show different personality. For example, some individuals are consistently more bold than others.
"But in biology, we still do not fully understand what is behind the fact that people or animals show different personalities. In humans, people with different levels of a signaling substance in the brain, such as serotonin or dopamine, behave differently. But we do not know if variations in these signaling substances can explain differences in personality in other species, and if signaling substances cause observed differences, or whether the differences in behavior and levels of signaling substances depend on another factor that is basically, says Robin Abbei-Lee, postdoctor at the Department for physics, chemistry and biology of IFM, one of the researchers who led the study.
He gave medication to people for medicine
Therefore, the researchers wanted to actively change levels of serotonin and dopamine signaling agents to investigate this, and used the study syringes. They did so by giving drugs that affected serotonin and dopamine systems, and used to treat people with depression or Parkinson's disease. Because serotonin and dopamine systems of different animals are similar to each other, researchers have expected that medication also affects smugglers.
"In this study, we wanted to gain a significant gap in the knowledge of experimental changes in the levels of these signaling substances and see if this could lead to a change in behavior in the cysts," says Hanne Løvlie, an IFM assistant who studied the study.
Then he measured the behavior of cricket
The researchers measured three different behaviors in the cysts.
"We measured how many active strikes were in a familiar environment, which corresponds to how much a person moves in his home. We have also explored the cricketing behavior in a new environment, similar to how a person can behave in a visit to a new city. cricketing behaved in combat situations to measure the aggressiveness of individuals, says Robin Abbei-Lee.
The researchers found that changes in serotonin levels make strikes less active and less aggressive. Changed levels of dopamine, on the other hand, were not associated with changes in behavior in cysts.
"This shows that serotonin has a clearer role in these behaviors," says Hanne Løvlie.
Findings increase our understanding of why animals have a personality. They also raise the question of how drugs that pass through our wastewater in nature affect wildlife.
"Experimental manipulation of monoamine levels changes personality in smugglers", Abbei-Lee RN, Uhrig EJ, Garnham L, Lundgren K, Child S, LøvlieH, (2018), Scientific Reports, published online November 1, 2018.