The purpose of the present experiment is to extend the results of Kosslyn (1980) by investigating individual differences in mental image generation and inspection. Twenty fast image-generating subjects and twenty slow image-generating subjects who were selected in the pretest were given each of seven animals' names and were instructed to generate visual images or not. They were presented a property of an animal and were instructed to judge whether the animal possessed the property. Animal properties varied in size and associative strength based on the results of the pretest. Results of fast image subjects differ from those of slow ones. Individual differences in visual imagery were discussed.