Piaget and other infant researchers had to develop different techniques (such as hiding toys under blankets) to study the thinking of infants because infants lack skills.

verbal

Explanation:

According to my research on studies conducted on child development, I can say that based on the information provided within the question this is done because infants lack verbal skills. Since infants cannot express their thoughts or how they are feeling, researchers need to develop techniques in order to understand their thoughts and feelings.

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answer; /// i believe that the correct answer is(cognitive revolution);

ya i know i wanna was a good night i wanna was a good night i love y’all bye is your address again call tomorrow morning i love ya bye hi hi i’m going crazy about going to the school and i don’t know if y’all want me or not going tomorrow and i’ll tell you what i’m doing and i’ll y’all with this i’m gonna was a really bad thing to say i don’t think i can but i’ll give ya my friend tomorrow night i love you and y’all so i don’t have a lot to say about you haha is this what time you should be home and i’ll give ya my number so i’m sorry i’ll call y’all bye love ya hey