Clifford M. Sloan, a lawyer for Mr. Moore, said there was no doubt that his client suffered from intellectual deficits. ''It's undisputed, for example,'' Mr. Sloan said, ''that at the age of 13, Mr. Moore did not understand the days of the week, the months of the year, the seasons, how to tell time, the principle that subtraction is the opposite of addition or standard units of measurement.''