Statement Lack of stimulation in the first four five years of life can have adverse consequences. Assumptions I. A great part of the development of observed intelligence occurs in the earliest year of life. II. 50% of the measurable intelligence at the age of 17 is already predictable by the age of four.

• if Assumption I is implicit
• if Assumption II is implicit
• iIf either Assumption I or II is implit
• if neither Assumption I nor II is implicit