Evidence for Exploring in a visual mode #

Every substantive claim on the Exploring in a visual mode page is checked against current research. Here is each claim, how well today’s evidence supports it, and the sources. The full, de-duplicated source list lives on the references page.

Supported · strong evidence — People learn more deeply from words and pictures together than from words alone (the multimedia principle), so representing a topic visually as well as verbally aids understanding.

The multimedia principle is supported by a large body of controlled experiments and multiple meta-analyses showing a consistent positive effect of adding relevant graphics to text or narration.

Sources: Mayer, R. E. (2021), Multimedia Learning, 3rd ed. — Cambridge University Press · Mayer, R. E., & Fiorella, L. (2022), The Cambridge Handbook of Multimedia Learning, 3rd ed. — Cambridge University Press · full reference ›

Supported · moderate evidence — Words and imagery are processed through two partly separate channels (a verbal channel and a visual/imagery channel), and encoding an idea in both creates two retrieval routes, making it more memorable than encoding it in one channel alone.

Dual-coding theory remains a foundational and broadly accepted account in cognitive psychology; the two-channel architecture is consistent with Baddeley’s working-memory model and the additive-trace advantage is supported by picture-superiority and imagery-plus-verbal encoding findings.

Sources: Paivio, A. (1986), Mental Representations: A Dual Coding Approach — Oxford University Press · Clark, J. M., & Paivio, A. (1991), Dual coding theory and education, Educational Psychology Review 3(3), 149-210 · full reference ›

Supported · strong evidence — The benefit of a visual comes from explaining structure, process or spatial relations; purely decorative images do not aid, and can distract from, learning.

Mayer’s coherence principle — that extraneous, decorative (‘seductive’) material depresses learning — is well replicated; instructional benefit comes from explanatory rather than decorative graphics.

Sources: Mayer, R. E. (2021), Multimedia Learning, 3rd ed. — Cambridge University Press · Sundararajan, N., & Adesope, O. (2020), Keep it coherent: A meta-analysis of the seductive details effect, Educational Psychology Review 32, 707-734 · full reference ›

Supported · strong evidence — Placing related words and pictures (e.g. a diagram and its labels) near each other in space improves learning compared with separating them, because it reduces wasted working memory from visual search.

Spatial contiguity is among the most consistently replicated multimedia-design findings, explained by reduced extraneous load from not having to visually search for and hold separated items in working memory.

Sources: Mayer, R. E. (2021), Multimedia Learning, 3rd ed. — Cambridge University Press · Schroeder, N. L., & Cenkci, A. T. (2018), Spatial contiguity and learning: A meta-analysis, Educational Psychology Review 30, 679-701 · full reference ›

Supported · moderate evidence — Generating a visual representation yourself (drawing a diagram, building a map of the material) supports understanding more than passively viewing a ready-made one.

Learner-generated drawing and learner-constructed graphic organisers are documented ‘generative learning’ strategies; effects are positive but vary with task support and drawing quality, so the strength is moderate rather than strong.

Sources: Fiorella, L., & Mayer, R. E. (2015), Learning as a Generative Activity — Cambridge University Press · Van Meter, P., & Garner, J. (2005), The promise and practice of learner-generated drawing, Educational Psychology Review 17, 285-325 · full reference ›

Supported · moderate evidence — Diagrams that make the relationships and linkages between the parts of a system visible help learners understand how the system behaves, beyond studying parts in isolation.

Explanatory diagrams that depict structural and causal relations support comprehension of how systems function; benefit depends on the diagram conveying the relevant relations rather than decoration, consistent with multimedia and graphic-comprehension research.

Sources: Mayer, R. E. (2021), Multimedia Learning, 3rd ed. — Cambridge University Press · Hegarty, M. (2011), The cognitive science of visual-spatial displays, Topics in Cognitive Science 3(3), 446-474 · full reference ›

Supported · moderate evidence — The verbal and visual processing channels each have limited capacity, so cluttering a display with extraneous material overloads the channel it was meant to support.

Limited working-memory capacity per channel is a core, well-supported assumption shared by cognitive load theory and the cognitive theory of multimedia learning, building on Baddeley’s working-memory research.

Sources: Mayer, R. E. (2021), Multimedia Learning, 3rd ed. — Cambridge University Press · Sweller, J., van Merrienboer, J. J. G., & Paas, F. (2019), Cognitive architecture and instructional design: 20 years later, Educational Psychology Review 31, 261-292 · full reference ›

Supported · moderate evidence — Visual exploration is a general-purpose tactic any learner can use, not a technique whose effectiveness depends on being a ‘visual learner’ matched to visual material.

Reframing visuals as broadly useful rather than matched to a learner type is consistent with the evidence: reviews find no reliable support for the meshing hypothesis (tailoring instruction to a person’s learning style improves their outcomes), while dual-coding benefits apply across learners.

Sources: Pashler, H., McDaniel, M., Rohrer, D., & Bjork, R. (2008), Learning styles: Concepts and evidence, Psychological Science in the Public Interest 9(3), 105-119 · Nancekivell, S. E., Shah, P., & Gelman, S. A. (2020), Maybe they’re born with it, or maybe it’s experience: Toward a deeper understanding of the learning style myth, Journal of Educational Psychology 112(2), 221-235 · full reference ›

Mixed · weak evidence — Mind mapping — organising a topic as a central theme with radiating branches — is a recognised visual technique for laying out the hierarchy and connections within a subject.

Mind mapping is a real and widely used graphic-organiser technique and can aid recall and overview, but controlled studies show mixed results and no consistent advantage over other forms of note-making or concept mapping; the page’s modest framing (the value is in actively building the map) is defensible.

Sources: Buzan, T. (2018), Mind Map Mastery — Watkins Publishing · Nesbit, J. C., & Adesope, O. O. (2006), Learning with concept and knowledge maps: A meta-analysis, Review of Educational Research 76(3), 413-448 · full reference ›