Fig. 1From: The impact of oxytocin administration on brain activity: a systematic review and meta-analysis protocolIncreasing interest in fMRI and oxytocin. PubMed metadata was collected on the number of articles containing the terms “fMRI” and “oxytocin” published between 2004 and 2014. A loess smoothed fit curve was overlaid on data points to illustrate the year-to-year trend. Data was collected using the “RISmed” R packageBack to article page