Prior to the eye-tracking phase of the experiment, all participants were assessed using a cognitive battery comprising a standardized digit span from the Wechsler Adult Intelligence Scale III (WAIS III; Wechsler, 1997a); Corsi blocks of the spatial span (Wechsler Memory Scale III; Wechsler, 1997b); and the National Adult Reading Test (Nelson, 1982). The older group of participants was additionally screened using the Mini Mental State Examination (Molloy et al., 1991), a brief screening instrument for dementia in order that any participants exhibiting signs of dementia or mild cognitive impairment could be excluded from the experiment.