During social communication, individuals adapt their behavior based on the actions of the other person. Nonverbal communication, particularly through gestures, is a crucial aspect of this interaction. Gesture imitation helps individuals perceive similarity, synchronize with others, learn, and recognize patterns. This review aims to highlight the most recent studies between 2019 and 2024 that used hyperscanning configurations during social interaction to investigate inter-brain synchronization. The selected papers are selected based on the preferred reporting items for systematic reviews and meta-analyses (PRISMA) and addressed based on paradigms and findings. The studies indicated that increased brain synchronization is linked to improved social interactions during eye contact, especially between parents and infants. Eye contact can modulate neural synchronization and enhance cooperation and competition. In humans, certain brain regions, including the frontopolar area and dorsolateral prefrontal cortex (dlPFC), are activated when observing hand actions in videos, while areas like the orbitofrontal cortex, dorsomedial prefrontal cortex, anterior cingulate cortex, and amygdala play a role in social gaze. In bats, the power of brain activity varies across different frequency bands, with low-frequency bands being more active during rest and high-frequency bands being more active during active behaviors. In conclusion, the reviewed studies underscore the importance of inter-brain synchronization in facilitating social interactions. Eye contact plays a significant role in modulating neural activity and promoting both cooperation and competition. Understanding the neural mechanisms underlying these interactions, across both humans and animals, can provide deeper insights into the complexities of social behavior and communication.