This is the dataset associated with the CardiAg study, where we investigated whether and how Cardiorespiratory fluctuations influence voluntary action initiation and Sense of Agency (SoA), i.e., the feeling of controlling one’s actions and their outcomes, by combining electrocardiography (ECG) and respiratory (RESP) recordings during an intentional binding task (Haggard et al., 2002). The dataset is structured according to the Brain Imaging Data Structure (BIDS) v1.10 standards. The provided files include: * 'CardiAg_data.zip': folder including the raw behavioral, ECG and respiration data, as well as the derivative data. We recommend to work with the already preprocessed data found in the derivatives/beh-preproc/, derivatives/ecg-preproc/ and derivatives/resp-preproc/ folders. * 'CardiAg_results.zip': folder including the data visualization outputs (i.e., figures included in the manuscript).