This is the raw data collected for an ERP study on field dependence-independence. Field dependence-independence (FD-I) is a widely studied dimension of cognitive styles designed to measure an individual’s ability to identify embedded parts of an organized visual field as entities separated from that given field. The aim of the research is to determine whether the brain activity features that have been found to be perceptual switching indicators could serve as robust features, differentiating field-dependent from field-independent participants. Previous research suggests that various event related potential (ERP)-related and frequency features are associated with the perceptual reversal occurring during the observation of a bistable image. In this study we combined these features in the context of a different experimental scheme using ambiguous and unambiguous stimuli during participants’ perceptual observations.