Difference between revisions of "Multimedia Presentations"

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2. '''Segmentation Effect''' - students show better comprehension of multimedia explanations when it is presented in paced, student-controlled segments rather than a continuos presentation.  This way, the student can make sure they understand one concept before being presented with another, presumably more complex one.
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2. Students show better comprehension of multimedia explanations when it is presented in paced, student-controlled segments rather than a continuous presentation, known as the Segmentation Effect.  This way, the student can make sure they understand one concept before being presented with another, presumably more complex one. Since the comprehension of abstract concepts builds on basic ones, students must have a strong base in order to properly comprehend higher ones.  Asking students if they are ready to continue lecture once a unit is complete would be an example of this.  Another example would be having a 'question session' after each main concept presented in lecture--this would provide student feedback and clarify any doubts they have. 
 
 
  
 
3. '''Pretraining Effect''' - students show better understanding of a multimedia explanation when they are presented with background information (i.e. relevant jargon) prior to the lesson.  An example of this would be providing a list of relevant vocabulary prior to powerpoint lectures.
 
3. '''Pretraining Effect''' - students show better understanding of a multimedia explanation when they are presented with background information (i.e. relevant jargon) prior to the lesson.  An example of this would be providing a list of relevant vocabulary prior to powerpoint lectures.

Revision as of 12:56, 25 June 2011

Many schools encourage the use of technology in the classroom in an attempt to keep it from becoming outdated and boring. More importantly, as the technology at the hands of learners changes, so must the way they learn. A great example of this is the use of multimedia, more specifically presentations tools like powerpoint, in conjunction with lecture. That being said, much research has looked at how to properly employ the use of powerpoint. Here is a list of what the latest research tells us:

-Be weary of redundancy. Research by Jamet and Le Bohec in 2006 showed a negative effect on several forms of information recall for students presented with powerpoint presentations that directly mirrored the instructor's lecture.

-Concise is better. Research in 2003 by Bartsch and Cohern showed that elaborate powerpoint features such as unrelated images, sounds and extraneous information impaired student learning.

-Draw your own graphs. Research in 2003 by Stern, Aprea and Ebner showed that groups presented with a graph that was ‘actively illustrated’ performed better in recall tasks than groups passively presented with the same graph.


"9 Ways to Reduce Cognitive Load in Multimedia Learning" (Mayer & Moreno, 2003)

This paper by Mayer and Moreno addresses the problems inherent of using multimedia when teaching. The author propose a theory of multimedia learning based on 3 assumptions: the dual-channel assumption, the limited-capacity assumption, and the active-processing assumption. The dual-channel assumption asserts that humans process verbal and visual in separate systems. The limited-capacity assumption asserts that a limit exists as to the amount of information each system can process at any given time. The active-processing assumption asserts that meaningful learning represents necessitates higher cognitive processes such as building connections between verbal and visual representations of information. Based on these assumptions, the authors put forth the idea of Cognitive Overload which occurs when a learner's cognitive capacity is exceeded by the amount of cognitive processing desired by the learner. Having identified the problem of Cognitive Overload and the assumptions made, the authors proceed to propose several ways of alleviating it. These ideas/theories are as follows:

Main Tips/Methods to Incorporate in the Economics Classroom:

1. Students show better comprehension of concepts presented as diagrams/animations when they are presented with narration rather than text, known as the Modality Effect. This means when presenting graphs, like a demand curve, it is more effective to present the graph and give an explanation of it rather than present the graph with a written explanation. Presenting both a graph and written text overloads the visual learning system while failing to employ the auditory one. A graph presented with a verbal explanations employs both the visual and auditory systems, resulting in more effective transmission of information.


2. Students show better comprehension of multimedia explanations when it is presented in paced, student-controlled segments rather than a continuous presentation, known as the Segmentation Effect. This way, the student can make sure they understand one concept before being presented with another, presumably more complex one. Since the comprehension of abstract concepts builds on basic ones, students must have a strong base in order to properly comprehend higher ones. Asking students if they are ready to continue lecture once a unit is complete would be an example of this. Another example would be having a 'question session' after each main concept presented in lecture--this would provide student feedback and clarify any doubts they have.

3. Pretraining Effect - students show better understanding of a multimedia explanation when they are presented with background information (i.e. relevant jargon) prior to the lesson. An example of this would be providing a list of relevant vocabulary prior to powerpoint lectures.


4. Coherence Effect - students show better understanding of multimedia explanations when they lack extraneous information, sounds and images. It is believed that unnecessary factors 'take up' cognitive processing away from necessary ones.


5. Signaling Effect - in multimedia presentations that do cannot exclude extraneous information, students show better understanding when educators include signals as to what information is important (i.e. bolding important terms or underlining them).


6. Spatial Contiguity Effect - student understanding is better when text is placed near the image it corresponds to.


7. Redudancy Effect - comprehension is negatively affected when on-screen text mirrors lecture. For example, an explanation of diminishing marginal utility is given by a professor, but also concurrently presented in text on a powerpoint slide.


8. Temporal Contiguity Effect - when presented with mixtures of narration and multimedia (i.e. a verbal explanation and an animation) students show better understanding if both forms are presented simultaneously rather than successively. For example, instead of explaining the income effect and then showing an animation that explains it again, the explanation and the animation should be presented in a sequential, simultaneous manner.


9. Spatial Ability Effect - this effect has to do personalizing multimedia presentations for each student. It holds that high spatial learners benefit more from simultaneous presentation of narration, sound and images and therefore should be presented with it.

For the original article, click here.

Evidence

Bartsch & Cobern, 2003. This study, titled "Effectiveness of PowerPoint Presentations in Lectures," examined the differences in preference, perceived learning and test performance between class units taught using transparencies, a basic powerpoint presentation and an advanced powerpoint presentation including images and sounds. Students were surveyed directly after each lecture and at the end of the course and performance was measured using class averages on assessments administered for each unit. The study found no significant difference in preference between the three modes of presentation for end-of-class ratings, but a preference for powerpoints in the end-of-semester ratings. Students believed they learned more from both types of powerpoint presentations than from transparencies. It was found that students performed about 10% worse on the units taught using the advanced powerpoint presentation that included images and sounds. Upon this finding, researchers decided to examine the effect of relevant and irrelevant powerpoint images on test performance and enjoyment. Participants were shown 30 slides that included a fact and an image that was either relevant or irrelevant to the fact. Afterwards, participants were given a test on the slides' information. It was found irrelevant images had a significant negative effect on both performance and enjoyment. On the other hand, relevant images had neither a negative nor positive effect on performance and enjoyment of the material. Click here to see the study.

Jamet & Le Bohec, 2006. This study, titled "The Effect of Redundant Text in Multimedia Instruction," examined the interactions of redundant text and spoken information in cognitive psychology students learning different theories of memory. A lecture was presented to the students. This lecture was accompanied by a powepoint-style presentation that included a diagram of the memory theory being taught and no text (no redundancy), text (redundancy: text mirroring the entire lecture presented all at once), or sequential text (text mirroring the text was presented sequentially, after being spoken). Students were then assess on information retention, transfer (applying the information learned to more abstract situations) and diagram completion. Students in the non-redundant group significantly outperformed students in the redundant conditions, both full text and sequential text. No significant differences were observed between the full text and sequential text conditions, suggesting that redundancy itself plays the negative role, regardless of the order in which redundant information is presented. Click here to see the study.

Sources

Bartsch, R. "Effectiveness of PowerPoint Presentations in Lectures." Computers & Education 41.1 (2003): 77-86. Print.

Jamet, E., and O. Lebohec. "The Effect of Redundant Text in Multimedia Instruction." Contemporary Educational Psychology 32.4 (2007): 588-98. Print.

Mayer, Richard, and Roxana Moreno. "Nine Ways to Reduce Cognitive Load in Multimedia Learning." Educational Psychologist 38.1 (2003): 43-52. Print.

Stern, E. "Improving Cross-content Transfer in Text Processing by Means of Active Graphical Representation." Learning and Instruction 13.2 (2003): 191-203. Print.