What is a key characteristic of negative schizophrenia?

The key characteristic of negative schizophrenia is indeed the lack of motivation and isolation from society. Negative symptoms refer to the absence or reduction of typical functions and behaviors that are generally expected in individuals, which can manifest as a diminished capacity to experience pleasure (anhedonia), reduced emotional expression (flat affect), and a significant decrease in social engagement or motivation.

These symptoms can lead to difficulties in initiating and sustaining activities that were once enjoyed or essential to daily living, resulting in the individual withdrawing from social contact and personal responsibilities. This aspect of negative schizophrenia contrasts with positive symptoms, which include hallucinations and delusions, and reflects a person's struggles with internal experiences rather than external manifestations of the disorder.

The other options describe characteristics that do not align with the negative symptomatology of schizophrenia. For instance, involvement of hallucinations and delusions pertains to positive symptoms. Extreme inattention and hyperactivity are more characteristic of attention-deficit disorders rather than schizophrenia. Inflexible behavior patterns do not specifically capture the essence of negative schizophrenia, focusing instead on behavioral rigidity, which isn't a defining feature of the disorder's negative symptoms.