Eleni Orfanidou is Lecturer of Cognitive/Experimental Psychology at the University of Crete, Greece. She was previously Postdoctoral Research Fellow at City University London, UK, and Research Fellow at the Deafness Cognition and Language Research Centre at University College London, UK. She has published on various aspects of psycholinguistics and neurolinguistics in Journal of Cognitive Neuroscience, Journal of Memory and Language, and Nature Communications. Bencie Woll is Professor of Sign Language Studies and Director of the Deafness Cognition and Language Research Centre at University College London, UK. She was elected as a fellow of the British Academy in 2012. She is the co-author or co-editor of many books, including her most recent, Sign Language: An International Handbook (2012) and The Signs of a Savant (2010). Gary Morgan is Professor of Psychology at City University London and Deputy Director of the Deafness Cognition and Language Research Centre at University College London, UK. He has published widely on sign language acquisition, theory of mind development, and psycholinguistic studies of sign languages, and he has developed several tests for assessing language skills in children. He is the co-author of several books, including Directions in Sign Language Acquisition (2002) and The Signs of a Savant (2010).