Prevalent, automatic, and powerful, emotional experience forms an integral part of human life. Despite numerous studies pointing at the impact of emotion in shaping one’s interpretation of situation and guiding action, emotional experience has not been studied extensively due to its idiosyncratic nature. However, advances in neuroimaging techniques and statistical analysis methods enabled more rigorous investigation of subjective experience, one of which is neural synchrony. Here we sought to examine if neural synchrony in regions within the default mode network, including medial prefrontal cortex (mPFC), bilateral temporoparietal junctions (TPJ) and inferior parietal lobules (IPL), underlies shared emotional experience. A hundred and four participants watched political videos while being scanned by Functional Near-Infrared Spectroscopy (fNIRS) and rated their emotional experience afterwards. Although initial Inter- Subject Correlation Analysis and Inter-Subject Representational Similarity Analysis did not yield significant findings, we addressed limitations of both approaches – loss of dimensionality and unequal comparisons of dyads – by combining them with k-means clustering. This improved version of analysis revealed that subjects who reported more similarly negative, but not positive, emotional experiences exhibited more synchronized neural fluctuations in mPFC. The results suggest that neural synchrony in mPFC may be driven primarily by negative sentiments and serve as a neural signature for subjective emotional experience.