Isometric vs. Orthographic Projections: EEG Reveals Distinct Cognitive Load in CAD Modelling
The way technical drawings are presented significantly impacts engineers' cognitive load and brain activity during CAD modelling, with isometric projections potentially engaging different neural pathways than orthographic ones.
Scientific Reports · 2023
Key Findings
- 01Significant differences in theta, alpha, and beta TRP were observed when engineers interpreted technical drawings and performed CAD modelling from them, depending on whether orthographic or isometric projections were used.
- 02Theta and alpha TRP showed particular differences across individual electrodes, cortical hemispheres, and cortical areas, with theta TRP over the right hemisphere and frontal area being key discriminators.
- 03Engineers' brain activity is sensitive to the visual representation used for technical systems.
Application
Design takeaway
Designers should consider the cognitive implications of visual representation choices in technical drawings and CAD interfaces, as they directly influence user performance and mental effort.
How to apply
When designing user interfaces for CAD software or creating technical documentation, consider presenting information in a way that is intuitively understood and minimizes cognitive strain.
Project actions
- 01When designing a CAD interface, consider user testing with different visual presentation options.
- 02Explore how different types of technical drawings affect user performance in your own design projects.
Method & Evidence
Variables
Strengths & Limitations
Strengths
- +Uses objective physiological measures (EEG) to assess cognitive load.
- +Directly investigates the impact of visual representation on a core design activity (CAD modelling).
Limitations
A simplified experiment might not capture the full complexity of professional CAD work. Participant fatigue could also be a factor.
Reliability & validity
The use of EEG provides a relatively objective measure, but the interpretation of brainwave data can be complex. The controlled experimental setup enhances internal validity, but the limited sample size and specific task may affect external validity.
Think critically
To what extent can these findings be generalized to designers with varying levels of experience or across different design software?
Design Principles
"Visual information presentation should be optimized to minimize unnecessary cognitive load and enhance task efficiency."
Understanding the cognitive demands of different visual representations is crucial for optimizing CAD software and training. This insight directly relates to the 'Modelling' and 'Human Factors' sections of the design curriculum, highlighting how interface design and information presentation affect user performance and cognitive processes.
What This Means for Your Design
How you show a 3D object on a 2D drawing (like using isometric or orthographic views) changes how hard your brain has to work when you're using a computer to design it.
How to use in your project
- 1.If your project involves a digital interface or technical drawings, discuss how your chosen visual representations might impact user cognition.
- 2.Consider user testing to see if different visual styles lead to different performance outcomes.
Add to My Project
Quick Cite
(2023). Differences in engineers’ brain activity when CAD modelling from isometric and orthographic projections. Scientific Reports. https://doi.org/10.1038/s41598-023-36823-9 Retrieved from https://designdex.org/study/df505a1a-b561-477d-9ef5-ccb7b1f06161/isometric-vs-orthographic-projections-eeg-reveals-distinct-cognitive-load-in-cad-modelling
Paragraph starter
The choice of visual representation in technical drawings, such as orthographic versus isometric projections, can significantly influence the cognitive demands placed on designers during CAD modelling. Research indicates that different projection types elicit distinct brain activity patterns, suggesting varying levels of mental effort and information processing. Therefore, designers should carefully consider the visual presentation of information in their designs to optimize user efficiency and reduce cognitive load.
Source
Scientific Reports
Differences in engineers’ brain activity when CAD modelling from isometric and orthographic projections
journal · 2023
View sourceQuestions about this research
- What does the research say about isometric vs. orthographic projections: eeg reveals distinct cognitive load in cad modelling?
- Designers should consider the cognitive implications of visual representation choices in technical drawings and CAD interfaces, as they directly influence user performance and mental effort. Evidence: Scientific Reports (2023).
- Why does "Isometric vs. Orthographic Projections: EEG Reveals Distinct Cognitive Load in CAD Modelling" matter for design?
- Understanding the cognitive demands of different visual representations is crucial for optimizing CAD software and training. This insight directly relates to the 'Modelling' and 'Human Factors' sections of the IB DT syllabus, highlighting how interface design and information presentation affect user performance and cognitive processes.
- How can designers apply this research?
- Designers should consider the cognitive implications of visual representation choices in technical drawings and CAD interfaces, as they directly influence user performance and mental effort.
- What were the main findings?
- Significant differences in theta, alpha, and beta TRP were observed when engineers interpreted technical drawings and performed CAD modelling from them, depending on whether orthographic or isometric projections were used.. Theta and alpha TRP showed particular differences across individual electrodes, cortical hemispheres, and cortical areas, with theta TRP over the right hemisphere and frontal area being key discriminators.. Engineers' brain activity is sensitive to the visual representation used for technical systems.
- What research method was used?
- Experimental with 20 participants.
- How strong is the evidence?
- Evidence strength is rated Moderate effect, based on a 2023 journal from Scientific Reports.
- What should I do differently in my next project?
- When designing user interfaces for CAD software or creating technical documentation, consider presenting information in a way that is intuitively understood and minimizes cognitive strain.
- What are the limitations?
- The study focused on a specific set of design tasks and a limited sample size. Generalizability to all engineering disciplines and experience levels may be limited.
- Is there evidence that cad affects design outcomes?
- The study found that the type of technical drawing (isometric vs. orthographic) affects how engineers' brains work when they are using CAD software, suggesting that one type might be more cognitively demanding or engaging than the other. Understanding the cognitive demands of different visual representations is crucial Source: Scientific Reports (2023).
- Where does this orthographic projections research apply?
- Engineering design, specifically Computer-Aided Design (CAD) modelling. It sits within modelling research on designdex.org.
Related research topics
cad design research · evidence on cad · does cad improve design outcomes · orthographic projections studies for designers · cad and orthographic projections findings · modelling research evidence