In the vast body of scientific writing on religion, there's a subset of research that focuses on connections between spiritual belief and the brain—as an academic might put it, the "cognitive biases" that underlie faith. And within that group, there's an even smaller subset that focuses, at least in small part, on Finnish mind readers.
To be fair, it's possible that this research is limited to one paper, onerously titled "Ontological Confusions But Not Mentalizing Abilities Predict Religious Belief, Paranormal Belief, and Belief in Supernatural Purpose," slated to be published in an upcoming edition of the journal Cognition. In it, three neuroscientists from the University of Helsinki set out to determine how much people's "social and emotional abilities" influenced their supernatural or religious beliefs, including faith in the existence of God and/or an interest in "astrology, telepathy, precognition, witchcraft, superstition, spiritualism, and psychokinesis." Using a sample of 2789 Finns, the researchers tested for a number of factors they thought might influence the participants' spiritual beliefs, including "self-reported affective and cognitive empathy (i.e., mind reading)."
Apparently, researchers have long been getting people to self-assess their telepathic ability, which may have made it easier for the authors to casually drop that reference to mind reading into a sentence otherwise stuffed with academic jargon. Over email, the lead researcher, Marjaana Lindeman, explained the tests her team used to determine people's self-reported ability perceive the thoughts of others:
We had several questions in three scales. The first scale was a questionnaire with 15 statements. The scale included such statements as “I can sense if I am intruding, even if the other person does not tell me,” [and] “I really enjoy caring for other people.” The participants were asked to indicate their agreement with these items. We also asked the participants to rate how touching they find a set of photographs about distressed individuals. Finally, we used the Adult Reading the Mind in the Eyes Test. It includes photographs of the eye-region of the face of different actors and actresses and the participants are asked to indicate what a person in the picture is thinking or feeling.
Originally used in autism research, the Adult Reading the Mind in the Eyes Test uses images of people's eyes, asking participants to determine what emotion the person in the picture is experiencing. For this set of eyes, an example that has been used in previous studies, participants have to identify whether the person is alarmed, ashamed, bewildered, or serious (the correct answer):
For this set, participants must identify whether they eyes are aghast, irritated, impatient, or reflective (the correct answer):
The researchers were interested in finding out about the participants' mind-reading abilities in order to test what they describe as a common hypothesis in the scientific literature: that the ability to perceive or project people's thoughts and emotions indicates a way of thinking that also makes people more likely to believe in the paranormal or be religious. They call this "mentalizing." Mind-reading is a particularly important kind of "mentalizing," they argue, because some scholars have suggested that "the abilities to read the mental states of others may be related to mentalizing biases." In other words, they're guessing that mind readers are more likely to believe in things like ghosts and God.