A St Andrews University outreach project has examined the implications of judgments made about people's faces.
Scientists from the school of psychology led a "brain day" for S4-5 pupils last week, in which they had to choose which images looked more masculine.
Most people come to the same conclusions, telling psychologists that face- processing is a task usually conducted in the right side of the brain. The minority who disagree may have a more unusual left-brain bias.
"We're keen to engage local secondary children with research in science and raise their awareness of careers in psychology, neuroscience and mental health," said organiser Vicky Torrance, of Working in Health Access Network Fife.