Their precise studies have confirmed that our media mix (text, graphics, audio, animation, video) in online learning is often flawed, resulting in cognitive overload and dissonance.
Perhaps their greatest contribution has been in identifying redundancy as a serious problem in screen-based learning but they are known for research that produces clear practical recommendations that do not pander to those who think that media rich automatically means mind rich.
If you were asked to sum up the psychology of learning in three words, it would be ‘less is more’, that’s also Mayer and Clark’s mantra.
In one study, Mayer, et al (1996) presented 600 pieces of scientific learning and found that briefer versions, which were concise, coherent and co-ordinated, resulted in far more effective learning.
The lesson with text is to cut it ‘til it bleeds! Bullet points, simple writing, highlighted keywords and short paragraphs are all useful screen writing techniques.
Avoid eye candy
They are critical of gratuitous graphics which are added to simply fill slots on pages of text. This is not uncommon in e-learning where designers simply take a noun within the text and slam in an associated image. This does nothing, according to Mayer and Clark, than add cognitive load and slow up learning.
Avoid ear candy
Background music and environmental sounds create unnecessary cognitive load and distract from, rather than increase, learning.
Indeed, music, over longer periods of time can be incredibly annoying. Note that this also applies to sounds, such as beeps or applause, that reinforce right and wrong answers. This may be appropriate in a games, but not for most online learning. Ear candy is as bad as eye candy.
Text and graphics good
They argue that ‘text and simple relevant graphics’ can improve learning as they use separate cognitive channels. They are not absolutist on these rules, as text within graphics can be useful when explaining a process or in labeling.
Beware of text and animation
‘Text and animation’ which both use the visual channel, cause cognitive dissonance and often confuse rather than achieve learning. Animation, like video, should use audio narration, rather than accompanying text.
Beware of text and audio
They claim that words in both text and accompanying audio narration can hurt learning. This is interesting as it is often assumed that one needs both to cover accessibility issues.
In other words, they argue for using ‘audio and graphics’ without screen text. According to Clark and Mayer (2003), ‘audio or text on their own’ are better than ‘text and audio together’.
This is confirmed by another study by Kalyuga, Chandler and Sweller (1999) where the group with audio scored 64% better than the group with both text and audio. They claim that one or other is redundant and will overload the visual and aural channels.
A review of studies around this concept, known as the redundancy effect, by Sweller et al (1998) cites a list of research studies that all point to the damage done to learning when redundant material interferes with the efficacy of the learning.
For example; they illustrate a point about leaving out extraneous or distracting graphics in media with an experiment, conducted by Harp and Mayer (1997), in which students were given a text to read on lightning strikes.
Students who read the passage accompanied by elaborate colour photos with additional captions - as opposed to the text with simple graphics - showed 73% less retention of knowledge and 52% fewer solutions on a transfer test.
Keep it close
Mayer (1989), Mayer Steinhoff Bower (1995) and Moreno and Mayer (1999) in five separate studies compared graphics with text close to the graphics, and graphics with text below the graphics, at the foot of the screen.
In all five studies, learners who used the co-located text and graphics improved their problem solving by between 43-89%. Similar results have been found by Chandler and Sweller (1991), Pass and Van Merrienboer, (1994).
Making the learner’s eye jump from one part of the screen to another is disruptive and reduces the effectiveness of the learning.
E-learning has also introduced heavy doses of rollover text which is displaced away from the item over which the cursor rolls so that the pop-up text appears elsewhere on the screen at a distance from the item in question. The research confirms that this is to be avoided in learning programmes.
Backed up by the work of Nass and Reeves at Stanford (subject of my next post), they recommend a more conversational style, using first and second person language. This is not to say that it should be over-friendly or condescending. It should feel like a dialogue, not a lecture.
They also recommend the use of an on-screen coach or agent. Note that they absolutely recommend self-paced user control, as well as frequent practice and context setting through interactions.
Lessons for production
Their research explains why broadcast TV and web design companies often fail to produce good online learning. They are drawn to techniques that entertain rather than educate, often adding media that unintentionally degrades the learning experience.
This is why Nielsen and others were so critical of Flash, as it encouraged, the unnecessary addition of animation. On the other hand it confirms the use of short video lessons, with images and audio, as a form of instruction.
Clark and Mayer were among the first to seriously research the use of media in e-learning and have come up with empirically tested conclusions, often repeated by others, which suggest that many common practices in e-learning design are, in fact, wrong.
They actually result in harming rather than helping the learning process. They call for simpler, less gimmicky use of media. Animation and audio do NOT necessarily lead to better learning and may, in fact, degrade the learning experience.
Clark, Ruth and Chopeta Lyons (2004).Graphics for Learning: Proven Guidelines for Planning, Designing and Evaluating Visuals in Training Materials. Jossey-Bass Pfeiffer
Mayer R E and Clark R, E-learning and the Science of Instruction (see p61 for multiple references), Pfeiffer, 2003
Richard Mayer (2001). Multi-Media Learning. Cambridge University Press
Clark, Ruth (1999). Developing Technical Training: A Structured Approach for Developing Classroom and Computer-based Instructional Materials. ISPI
Mayer R E, Systematic Thinking Fostered by Illustrations in Scientific Text. Journal of Educational Psychology, 81, 240-246. 1989
Mayer R E, and Gallini J K. When Is An Illustration Worth a Thousand Words? Journal of Educational Psychology, 88, 64-73. 1990
Mayer R E and Anderson RB. Animations Need Narrations. Journal of Educational Psychology, 90, 312-320. 1991
Mayer R E and Anderson RB. The Instructive Animation: Helping Students Build Connections Between Words and Pictures. Journal of Educational Psychology, 90, 312-320. 1992