Kerrick, when told about his grandfather's sudden death, began to laugh aloud. the symptom of schizophrenia that kerrick demonstrated is

"Inappropriate Affect"

Explanation:

According to my research on the different symptoms of schizophrenia, I can say that the symptom demonstrated by Kerrick is called "Inappropriate Affect". This means that at times they exhibit affect that is inappropriate to the situation, such as laughing at something sad. Or sometimes show no emotion whatsoever in facial expressions, voice tone or mannerisms during situations that call for certain emotions.

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