Guillaume Thierry is Professor of Cognitive Neuroscience at Bangor University. He uses experimental psychology and electroencephalography to study language comprehension in the auditory and visual modalities, mainly the processing of meaning by the human brain. He has investigated a range of themes, such as verbal/non-verbal dissociations, visual object recognition, colour perception, functional cerebral asymmetry, language-emotion interactions, language development, developmental dyslexia, and bilingualism. He currently focusses mainly on linguistic relativity and the philosophical question of mental freedom.