On Colour, Category Effects, and Alzheimer’s Disease: A Critical Review of Studies and Further Longitudinal Evidence

Table 4

Independent predictors of naming performance, greyscale and colour items, in stepwise multiple regressions for controls (NC) and AD patients (two time-points); = semipartial correlation coefficient.

Greyscale items
	Controls		AD-1		AD-2
adjusted	.59		.46		.50
()	35.8 (.0001)		42.7 (.0001)		33.5 (.0001)
Age of acquisition	−.14	.18	−.19	.07	−.60	.0001
Familiarity	.02	.80	.64	.0001	.01	.35
Lexical frequency	.09	.40	.06	.6	.16	.12
Name agreement	.24	.0001	.15	.13	.08	.40
Typicality	.27	.0001	.06	.53	.01	.90
Visual complexity	−.14	.03	−.14	.17	−.20	.007
Domain	.19	.04	.25	.001	.30	.0001
Colour items
	Controls		AD-1		AD-2
adjusted	.58		.53		.53
()	34.4 (.0001)		27.9 (.0001)		28.9 (.0001)
Age of acquisition	−.28	.0001	−.01	.35	−.19	.007
Familiarity	.13	.22	.26	.0001	.12	.08
Lexical frequency	.01	.35	.15	.15	.04	.70
Name agreement	.13	.04	.19	.009	.01	.34
Typicality	.13	.20	−.01	.90	−.04	.73
Visual complexity	−.22	.001	−.14	.04	−.14	.04
Domain	.15	.02	.17	.01	.23	.001

Significant effects.