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Explanation: "Each "true" rating was determined using Morrow’s synthetic rating method using 4M (computerized MTM-1) as the predetermined normal time. Each scene is shown for approximately two minutes. This allows ample time to estimate both the lowest and highest possible ratings as well as a final rating judgment. Each scene is followed by a "Record Your Rating Now" title and this followed by a title with the "true" or MTM-based synthetic rating factor. An instructional handout and documentation showing the development of the synthetic rating factors is included."