of td in verbal responses. tdi scores are primarily derived from verbally-expressed interpretations of the rorschach test, but tdi can also be used with other verbal samples (including the wechsler adult intelligence scale). tdi has a twenty-three-category scoring index; each category scores the level of severity on a scale from 0–1, with .25 being mild and 1.00 being most severe (.25, .50, .75, 1.00). criticism td has been criticized as being based on circular or incoherent definitions. symptoms of td are inferred from disordered speech, based on the assumption that disordered speech arises from disordered thought. although td is typically associated with psychosis, similar phenomena can appear in different disorders and leading to misdiagnosis. a criticism related to the separation of symptoms of schizophrenia into negative or positive symptoms, including td, is that it oversimplifies the complexity of td and its relationship to other positive symptoms. factor analysis has found that negative symptoms tend to correlate with one another, but positive symptoms tend to separate into two groups. the three clusters became known as negative symptoms, psychotic symptoms, and disorganization symptoms. alogia, a td traditionally classified as a negative symptom, can be separated into two types: poverty of speech content as (a disorganization symptom) and poverty of speech, response latency, and thought blocking (negative symptoms). positive-negative-symptom diametrics, however, may enable a more accurate characterization of schizophrenia.