In this form of catatonia, individuals stop responding to their environment, remaining motionless and silent for long stretches of time.

Why is a standardized diagnostic classification system with agreed-upon definitions of psychological disorders useful in psychology?

a. Aids in clinical research b. Provides an unchanging description for disorders c. Offers a systematic and unified approach for treatment d. Quicker than describing the disorder in detail

Differential weighting of item responses has a significant effect on the reliability of an attitude

scale. Indicate whether the statement is true or false