A Fnirs Study On The Effect Of Different Territories To Aggression Behaviour

As early as the beginning of the20th century, people had began investigating animal’s territoriality. Then some scientists began take human as the research object and put forward the concept of human territoriality, which refers to an individual’s ownership to a target, and the intention of preventing others getting close to or possessing it. Later scholars began to study the effects of different territories on human behavior, and then propose two popular effects:the prior-residence effect and home advantage. These two concepts refer to that own have advantages over the visitor or intruder. But the most current research on the influence of different territory to attack or to animal research, the study of human are rare. Due to the limits of some instrument, there is no one has studied the impact of different territories on aggressive neural mechanisms. The conventional fMRI and ERP technology have a big problem of moving and are extremely sensitive to action. Functional near infrared spectral imager (fNIRS) is easy to move, not sensitive to the participants’action, at the same time with high spatial resolution and temporal resolution. Therefore in this study, we will use fNIRS to explore neural mechanisms of the influence of different territory to aggressive behavior.This study consists of two experiments. We use the revised PSAP offensive paradigm to measure the aggression behavior of the subjects in the first experiment. Recruit the college students as the subjects, compare the aggressive behavior of the subjects in their own territory and the subjects in others territories. Given the results in experiment1, we further exploring personality factors’contribution to the neural mechanisms underlying the relation between aggressive behavior and different territories. We use a same PSAP paradigm in experiment2as in experimentl. Recruit undergraduate students as the research objects. Set two kinds of experiment conditions:one is the subjects’own bedroom (own territory) and the other one is laboratory (non-territory).During the PSAP mission, asked the participants to wear fNIRS cap to investigate the influence of different territory on aggressive behavior and the neural mechanisms. Participants are asked to complete big five personality test after the completion of the experiments.Experiment results indicate that:1. Aggression behavior of the college student’s in different territory don’t have a significant difference.2. On the right frontopolar cortex, the own territory group’s brain activities caused by aggression behavior are stronger than the non-territory group.3. In the dorsolateral prefrontal cortex, the own territory’s brain activities caused by reward response are stronger than non-territory group.4. On the dorsolateral prefrontal cortex, own territory group participants’ defense reaction activation level is significantly higher than the non-territory group.5. In the own territory group, the subjects of aggressive behavior and rewarding response are negatively related with the corresponding change of oxy-hemoglobin Beta in the dorsolateral prefrontal cortex area.6. In the non-territory group, subjects’ scores and oxygenated hemoglobin change are positively correlated in the left medial dorsolateral prefrontal cortex.7. In both of the condition, the score of the neuroticism dimension is positively correlated with the dorsolateral prefrontal cortex activity when attacking opponents. In own territory group, agreeableness dimension scores and the dorsolateral prefrontal cortex activation level when attack opponent has significant negative correlation.