Psychology helps designers understand how users perceive and respond to products. The five senses affect product design because sensory information influences usability, safety, comfort, product identity, and the user's overall experience.
The Reasoning and Mechanism
Within A1.1 Ergonomics, psychological factors include attention and responses to sensory stimuli. Sensation is the detection of a stimulus by sensory receptors, while perception is the brain's interpretation of that information.
Designers therefore select properties such as colour, texture, sound, flavour, and scent to produce an intended response. Effective products provide clear sensory cues without confusing the user.
| Sense | Influence on product design | Example |
|---|---|---|
| Sight | Colour, contrast, and shape affect attention, interpretation, and accessibility. | A warning control uses high contrast so it is quickly identified. |
| Hearing | Sound can provide feedback or signal danger. | A microwave beeps when its cycle finishes. |
| Touch | Texture and vibration influence grip, comfort, and control. | A textured handle reduces slipping. |
| Smell | Odour can create emotional associations or warn of danger. | Scent supports a cosmetic brand's identity. |
| Taste | Flavour and mouthfeel affect food, medicines, and oral-care products. | Designers test flavour and texture before manufacture. |
Designers should consider multisensory interaction because users rarely experience one sense in isolation. A control may combine a visible icon, tactile click, and audible signal, reducing uncertainty and confirming that an action has occurred.
A common misconception is that sensory design is purely aesthetic. In fact, it can improve inclusive design, error prevention, accessibility, and usability. Designers should not rely on one sensory channel because users may have sensory impairments.
Exam Technique
In an IB response, link each design feature through a clear chain: sensory stimulus --> psychological response --> effect on usability or experience. Avoid merely listing the five senses; apply them to a named product and explain their consequences.
