The phenomenon of blocking is observed:

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Blocking is a phenomenon observed both at the behavioural and neural level. At the behavioural level, it is the failure of an organism to learn a new stimulus-response association when that association was already learned during a previous conditioning phase. At the neural level, it is the reduced activity in certain neurons due to the prior learning of a related stimulus. Therefore, blocking occurs at both the behavioural and neural levels.

The Phenomenon of Blocking Is Observed