Sex, Lies, and Brain Scans: How fMRI Reveals What Really Goes on in Our Minds by Barbara J. Sahakian and Julia Gottwald explores how functional magnetic resonance imaging (fMRI) is being used to investigate human thoughts, emotions, motivations, decisions, and behaviour. The authors explain how brain imaging can provide insights into subjects such as lying, unconscious racial bias, morality, self-control, romantic feelings, decision-making, and consumer behaviour. The book also examines the limitations of interpreting brain scans and discusses the ethical questions raised by emerging neuroscience, including whether fMRI should be used as a lie detector, to identify unconscious bias, or to influence personal and commercial decisions. It provides an accessible introduction to cognitive neuroscience while considering both the possibilities and ethical boundaries of modern brain research.