1. University of Kent, School of Computing, Canterbury CT2 7NZ, U.K. TMAC3@KENT.AC.UK
2. University of Kent, School of Computing, Canterbury CT2 7NZ, U.K. M.GRZES@KENT.AC.UK
3. University of Birmingham, School of Psychology, Birmingham B15 2TT, U.K.
4. University of Kent, School of Computing, Canterbury CT2 7NZ, U.K. H.BOWMAN@KENT.AC.UK