This research was an extension of a study conducted by Robert Jackson of the Special Devices Center. In his experiment a training film (Pattern for Survival) was shown to groups of trainees under two conditions: (l) to the first group the film was described as a kinescope recording of a television program, (2) to the second group the film was introduced as a regular training film. Similarly a kinescope recording of a television program (Radiological Defense) was shown to two groups of trainees: Jackson told one group that this kinescope recording was in fact a kinescope; the other group was told that it was a regular training film (see Appendix I for Jackson's instructions to trainees). A further section of Jackson's experiment dealt with color as an experimental variable, but the results were non-significant and do not concern us here. The results of the main part of the study however, were highly significant
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