I. Purpose: This study is an investigation of the instructional function of a visual continuum representing learning effectiveness using experimental classroom groups. In short, this study attempts to determine what effects the increases or decreases of realistic detail in visual illustrations have upon learning. II. Method: a. Hypotheses (1) Differences in visual realistic detail will produce different results in immediate retention. (2) Lower visual realistic detail will be more effective than higher visual realistic detail. (3) Differences in visual realistic detail will produce different results with regard to learning specific objectives. b. Subjects 280 (7 groups of 40 each) tenth-grade students of K. Senior High School participated in the experiment. c. Materials Slide sequences of visual illustrations contained in the text-book were presented to students in a biology class, The visual illustrations were divided on the basis of realistic detail into 7 types. (1) Verbal Presentation (2) Abstract Linear Presentation (B and W) (3) Abstract Linear Presentation (Color) (4) Drawing (detailed and shaded - B and W) (5) Drawing (detailed and shaded - Color) (6) Realistic Photograph (B and W) (7) Realistic Photograph (Color) Ten slides synchronized with a twenty minute oral presentation were presented to the students. Beforehand they received a ten minute pretest consisting of 30 items. After the presentation they received an immediate retention test consisting of 60 items. The test included the following sub-tests: (1) Drawing Test (2) Indentification Test (3) Terminology Test (4) Comprehension Test III. Results and Discussion On the basis of the results of the pretest and immediate retention test, an analysis of covariance was made. The differences in the effectiveness of the visual presentation were then investigated. Type (4), Drawing (detailed and shaded - B and W), was the most effective. Type (3), Abstract Linear Presentation (Color), and Type (5), Drawing (detailed and shaded - Color), tied as the next most effective presentations. Least effective were Type (1), Verbal Presentation; Type (6), Realistic Photograph (B&W); and Type (7), Realistic Photograph (Color). 1. Visual realism continuums are not reliable predictors of learning effectiveness in cases of learning without acquring related constructive perceptions. 2. In cases of learning for factual knowledge, Type (4), Drawing (detailed and shaded - B and W), is a reliable predictor of learning effectiveness. By presenting Drawing (B and W) learning effectiveness by relevant cues can be expected. 3. The learning effectiveness of Type (7), (Realistic Photograph - Color), was less because of interference of cues. This shows a need for reexamination of traditional pictorial theory. 4. It is necessary that different methods of presentation of materials should be designed according to the relevant learning objectives. Selection of materials presented is also necessary. 5. In case of learning with constructive perception, color is effective as cues for promoting discrimination.
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