Is a newer understanding of short-term memory that involves conscious, active processing of incoming auditory and visual-spatial information, as well as of information retrieved from long-term memory.

Causes of film fogging are a. secondary or scattered radiation exposure and outdated film. b. exposure of film to light during processing and solution splashed on the film before processing. c. movement of the patient and weak developing solution. d. incorrect placement of film and processing that's too long.