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Next, primary circular reactions sub-stage is when the infants are 1 to 4 months. For instance, infants are sucking his or her thumb, and as a result they will repeat the same actions because it pleasure them.
Infants who do not reach this sub-stage will not be able to look for it, but they will just not realize it.
As the infants are growing up to become toddlers, the sub-stages also moving to the next, tertiary secular reactions where occured during toddler age 12 to 18 months.
This is the highest stage in cognitive development because this is where a person can make such reasoning and hypothesis (Santrock, 2011) for example, not only concrete events but also towards abstract events such as feelings or inferencing scientific experiments.
Furthermore, Santrock (2011) proposed that there are two basic tendencies that will go together with these four stages, which are organization and adaption.
Besides,the author reported that Piaget did observing his own children and attracted to changes that occured and developed in children’s mind and the factors behind these changes.
As we know, the famous theory of cognitive development was found by Jean Piaget. Newkirk also mentioned that Piaget was a theorists and also a biologist.
The author also claimed about the other stages, that are the third stage, concrete operational stage which lasts from 7 until 11 or 12 years old and lastly moving to the fourth stage is formal operations stage.
Compared to the other three stages earlier which involving babies and children, this last stage is involving with the adolescence and adulthood.
Next, adaption is the process of an individual to adapt to the environment (Ormrod, 2011).
In the same way, Ormrod stated that there are two basic processes in adaption which are assimilation and accommodation.