A laboratory experiment to measure the effect of varying the length of a TV commercial and its position within a program indicates both length and position influence effectiveness. However, differences in effectiveness attributable to greater length or island position in the program were generally small.
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References
1.
BarclayW. D., DoubR. M., and McMurtyL. T., “Recall of T.V. Commercials by Time and Program Slot,”Journal of Advertising Research, 5 (June 1965), 46.