Abstract
Prior research has established that learning by teaching depends upon peer tutors’ engagement in knowledge-building, in which tutors integrate their knowledge and generate new knowledge through reasoning. However, many tutors adopt a knowledge-telling bias defined by shallow summarizing of source materials and didactic lectures. Knowledge-telling contributes little to learning with deeper understanding. In this paper, we consider the self-monitoring hypothesis, which states that the knowledge-telling bias may arise due to tutors’ limited or inadequate evaluation of their own knowledge and understanding of the material. Tutors who fail to self-monitor may remain unaware of knowledge gaps or other confusions that could be repaired via knowledge-building. To test this hypothesis, sixty undergraduates were recruited to study and then teach a peer about a scientific topic. Data included tests of recall and comprehension, as well as extensive analyses of the explanations, questions, and self-monitoring that occurred during tutoring. Results show that tutors’ comprehension-monitoring and domain knowledge, along with pupils’ questions, were significant predictors of knowledge-building, which was in turn predictive of deeper understanding of the material. Moreover, tutorial interactions and questions appeared to naturally promote tutors’ self-monitoring. However, despite frequent comprehension-monitoring, many tutors still displayed a strong knowledge-telling bias. Thus, peer tutors appeared to experience more difficulty with self-regulatory aspects of knowledge-building (i.e., responding appropriately to perceived knowledge gaps and confusions) than with self-monitoring. Implications and alternative hypotheses for future research are discussed.
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Acknowledgments
The author would like to thank Michelene Chi, Kurt VanLehn, Chris Schunn, and Janet Schofield for their insights and expertise. The author is also grateful to Robert Hausmann, Marguerite Roy, Kirsten Butcher, Soniya Gadgil, and Bibinaz Pirayesh for their advice, suggestions, and assistance with many aspects of the research. This research was funded in part by Faculty of Arts and Sciences Summer Research Awards to the author from the University of Pittsburgh, and by a National Science Foundation award to the Pittsburgh Science of Learning Center (SBE-0354420) at Carnegie Mellon University and the University of Pittsburgh.
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Appendices
Appendix 1
Human visual system text excerpt
Due to length, the entire human visual system text is not reproduced here. However, the following excerpt provides a representative sample of the style and tone of the text. This portion of the text described the lens and vitreous humor of the eye:
The cornea does most of the focusing of light, but additional focusing occurs by varying the thickness of the lens. This process is called accommodation. In this process, the ciliary muscles contract, which increases the curvature and focusing power of the lens. This process allows us to keep an image on the retina clear as we view things at varying distances. After light exits the lens, it passes through the vitreous humor, which is a clear, jelly-like substance in the middle of the eye. One purpose of this substance is to maintain the shape of the eye. In addition, the vitreous humor has a refractive index similar to that of the lens, which prevents further bending of the light.
Appendix 2
Knowledge assessment questions
The following items appeared on the Questions Test assessment. Each item is labeled regarding whether the question was a core question repeated across test phases or a new question appearing only on the posttest.
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What components of the eye are involved in focusing and directing light towards the retina? How do these components accomplish this process? (core question)
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How is light energy entering the eye converted to neural signals in the retina? Why is this process necessary? (core question)
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What are the most direct and least direct pathways that neural signals can follow to reach the brain from the photoreceptors? (core question)
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Why is the fovea the most sensitive section of the retina for detecting light patterns? Why is vision in the periphery less clear? (core question)
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How is the amount of light entering the eye regulated by the muscles of the iris? Why is this function important for normal vision? (new question)
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What are the two main functions of the vitreous humor? What properties of the vitreous humor are responsible for these functions? Why are these functions important for normal vision? (new question)
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What are the major functions of the cone receptor system and the rod receptor system? What causes these systems to possess these properties? (new question)
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Some animals can see in the dark. What are several ways that animal eyes might be structured differently than human eyes so that this is possible? (new question)
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Eyeglasses may be worn to correct for several visual impairments. What underlying problems may cause a person to need glasses? How do glasses compensate for impaired eye functions? (new question)
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Colorblindness is a disorder in which a person is unable to see colors. What are several potential problems underlying this disorder? How could a person be “blind” to only one or two colors? (new question)
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Roscoe, R.D. Self-monitoring and knowledge-building in learning by teaching. Instr Sci 42, 327–351 (2014). https://doi.org/10.1007/s11251-013-9283-4
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DOI: https://doi.org/10.1007/s11251-013-9283-4