What you'll learn

• What cognitive ergonomics is and why it matters in workplaces.
• How cognitive overload can lead to errors, stress and slower decisions.
• Why being observed at work can change behaviour and affect research validity.
• How Drews and Doig (2014) used a configural display to improve ICU nurses’ monitoring of patients.

The big picture: ergonomics in environmental psychology

Environmental psychology studies how physical and social environments affect behaviour, thoughts and emotions. Ergonomics, also called human factors, is about designing environments, tools and systems around human abilities and limitations.

In this sub-topic, the focus is cognitive ergonomics: how workplace design affects attention, memory, decision-making and mental workload.

Cognitive overload

Cognitive load means the amount of mental effort a task requires. Cognitive overload happens when the demands of a task exceed a person’s available mental capacity.

In workplaces, overload can happen when someone has to monitor too many displays, remember too much information, switch between tasks quickly, or make high-stakes decisions while tired or stressed.

For example, an intensive care unit nurse may need to monitor heart rate, oxygen saturation, blood pressure, respiratory rate and medication levels at the same time. If these are shown as separate numbers, the nurse must mentally combine them to judge whether the patient is improving or deteriorating.

Observation in the workplace

Observation can be useful in workplace research because it allows psychologists or designers to see what workers actually do, rather than relying only on what they say they do. This can reveal interruptions, unsafe shortcuts, confusing layouts or communication problems.

However, observation can also change behaviour. Workers may become more careful, more anxious, or more likely to follow formal procedures when they know they are being watched.

This matters for ergonomics because a workplace may appear safer or more efficient during an observation than it really is day-to-day. It also raises ethical issues, especially if monitoring is constant, hidden, or used to punish workers rather than improve the system.

Key research: Drews and Doig (2014)

The named study for this topic is Drews and Doig (2014), “Evaluation of a configural vital sign display for intensive care unit nurses.”

This is applied cognitive research because it investigates how display design affects nurses’ interpretation of patient information.

Background to the study

In intensive care units, nurses must monitor patients whose condition may change quickly. Traditional vital-sign displays often present separate numerical readings. The problem is that the nurse has to integrate these readings mentally.

Drews and Doig investigated whether a configural display could make this easier.

The idea is that humans are often good at noticing patterns. If normal patient status creates a balanced shape, then deterioration may create a visible distortion.

Aim

Drews and Doig aimed to evaluate whether a configural vital-sign display would help ICU nurses interpret patient status more effectively than a conventional display.

The main issue was whether display design could reduce cognitive workload and support quicker, more accurate clinical decisions.

Method

This was a controlled simulation study using qualified intensive care nurses. Nurses were asked to interpret patient information presented through different display formats.

The independent variable was the type of display, such as a conventional numerical display compared with a configural display. The dependent variables included measures such as accuracy of interpretation, speed or efficiency of response, confidence, and perceived workload.

Because the study used a simulation rather than real patients, it allowed the researchers to control what information appeared and compare performance across display types without putting patients at risk.

Results and conclusions

Overall, the configural display was intended to support pattern recognition and reduce the mental effort of integrating separate vital signs. Drews and Doig found evidence that better-designed displays can support nurses’ understanding of patient state and reduce cognitive demands.

The conclusion is not simply “technology is better”. The stronger conclusion is that technology designed around human cognition can improve performance in complex workplaces.

Evaluating Drews and Doig (2014)

Strengths

A major strength is usefulness. The research has clear real-world application in healthcare, where better monitoring could help nurses notice patient deterioration earlier.

It also has strong scientific control compared with observing real ICU emergencies. A simulation allows researchers to present the same patient scenarios to different nurses, making display conditions easier to compare.

The study is also relevant to the cognitive area of psychology because it focuses on attention, perception and decision-making.

Weaknesses

A key weakness is that a simulation may not fully capture the emotional pressure, interruptions, teamwork and fatigue of a real ICU. This limits ecological validity.

There may also be sample limitations. ICU nurses are a specialised group, so findings may not generalise to all healthcare workers or to other workplaces without further testing.

Another issue is novelty. A new display may initially seem harder because users are unfamiliar with it, or it may seem better because it is interesting and attracts attention. Longer-term research would be needed to see whether benefits remain after routine use.

Ethics

The study is ethically safer than testing new displays during real emergencies. No patient care is put at risk in a simulation.

However, researchers still need informed consent, confidentiality, the right to withdraw, and sensitivity to professional reputation. Nurses’ performance data should not be used to shame individuals.

Application: designing better workplaces

Ergonomic research can be applied by redesigning workplaces so that important information is clear, interruptions are managed, and observation is ethical.

A good workplace design should:

• reduce unnecessary memory demands;
• group related information together;
• make abnormal states easy to detect;
• prioritise warnings so workers are not overwhelmed by alarms;
• test designs with real users before full implementation;
• use observation to improve systems, not just monitor individuals.

Example application: ICU monitoring station

A hospital could redesign an ICU monitoring station using Drews and Doig’s principles. Instead of showing only separate numbers, the system could include a configural display that shows the patient’s overall physiological state. A distorted shape could signal deterioration, while detailed numerical values remain available for expert checking.

This supports both fast pattern recognition and precise clinical judgement.

How to structure essay answers

For AO1, describe the background concepts: cognitive overload, observation, ergonomics and configural displays.

For AO2, apply those ideas to the workplace scenario in the question. Be specific: say exactly what feature of the workplace causes overload and exactly how you would redesign it.

For AO3, evaluate using validity, ethics, usefulness, sampling, ecological validity, reductionism and the individual/situational debate.

A strong debate link is individual versus situational explanations. Ergonomics shifts attention away from blaming workers and towards improving the situation in which they work.