Sensory experiences that occur without an external sensory stimulus are called

Hallucination

Explanation:

Hallucination are defined by the idea that a situation / a scenario exists which in reality does not exists. In extreme situations hallucinations may also lead a person to smell or touch things that do not exist. Hallucinations are mostly caused by mental illnesses or a breakdown of the nervous system.  

Sensory experiences that occur without external sensory stimulus are called hallucinations.

Explanation:

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