It sounds like negative symptoms, agreed.

Here is what Google finds, with a link to a PubMed article:

What are the 5 negative symptoms of schizophrenia?
The negative symptom domain consists of five key constructs: blunted affect, alogia (reduction in quantity of words spoken), avolition (reduced goal-directed activity due to decreased motivation), asociality, and anhedonia (reduced experience of pleasure).Feb 21, 2020 Negative Symptoms in Schizophrenia: A Review and Clinical Guide for Recognition, Assessment, and Treatment - PMC