1. Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne, UK
2. Facultad de Psicología, Universidad Complutense de Madrid, Campus de Somosaguas, Madrid, Spain
3. School of Computing, Newcastle University, 1 Science Square, Newcastle upon Tyne, UK
4. Newcastle Eye Centre, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Trust, Queen Victoria Road, Newcastle upon Tyne, UK