In the context of diagnosing psychological disorders, the loss of ability to think logically and clearly is called:

• A. catatonia
• B. anhedonia
• C. mania
• D. disorganized thinking

Answer: (D)

Verified step by step guidance

1. Understand the key terms related to psychological symptoms: catatonia refers to a state of unresponsiveness or motor immobility; anhedonia is the inability to feel pleasure; mania is a state of elevated mood and energy.
2. Focus on the symptom described: 'loss of ability to think logically and clearly' relates to cognitive processes, specifically how thoughts are organized and coherent.
3. Recognize that 'disorganized thinking' is a clinical term used to describe a disturbance in the logical flow of thoughts, often seen in disorders like schizophrenia.
4. Match the symptom to the correct term by eliminating options that do not relate to thought processes (catatonia, anhedonia, mania) and selecting 'disorganized thinking' as it directly describes impaired logical thought.
5. Conclude that the correct diagnosis term for the loss of ability to think logically and clearly is 'disorganized thinking'.