Foreign language acquisition is increasingly important in the global world, but language learning in adults is laborious, and therefore new efficient methods are needed for it. Several studies have shown that social interaction and embodiment in learning situations can facilitate foreign language learning. Still, the literature on adults is limited, and the underlying neural underpinnings are poorly understood. Our study examines whether phonetic learning with peers is more efficient than learning individually. Thirty-four native Finnish speakers were randomly assigned to two groups: a group learning phonetics in pairs (LPair: n = 16) or a group learning individually (LIndi: n = 18). Mandarin Chinese tones were taught for one hour per day within one week. Before and after the learning sessions, participants were tested individually, in which their behavioral performance in discrimination and categorization of tones, and electrical brain responses (event-related potentials, ERPs) in detecting deviant tones were measured. In addition, a listen-and-repeat task was performed, and EEG synchrony between the participant and a real-life tutor was recorded, along with their autonomous nervous system activity (skin conductance response and heart rate variability). Preliminary results showed the learning effect in the behavioral performance and ERPs, reflected by more accurate responses in discriminating different tones in the post-measurement and the changes in N2b amplitudes in attentive deviance detection after learning, respectively. However, no significant group differences were observed. In short, our study integrates research results obtained from various measures, which has a unique impact on the research of foreign language learning.