1. G063 - HCI Design Perception, Attention, Memory & Learning (PALM)

2. Learning Objectives: At the end of this topic you should be able to: indicate how perception, attention, memory, and learning affect HCI design choices

3. HCI Design Factors In trying to design an HCI which: is easy to learn is easy to remember reduces user error Factors to be considered will be: Perception Attention Memory Learning

7. Perception is the input from sight and sound (& touch?) user will have preconceived ideas : –colours: green for go, red for stop –sound: certain sounds are perceived as happy or sad –touch: key ‘click’ when pressed  haptic feedback need to take preconceived ideas into account: match = user thinks they can use the system  match = user may think they can’t use the system

8. Attention a user may have a limited attention span; So, to maintain attention: use consistent & logical layout –grouping of similar items - logical menu structure –familiar data entry - top to bottom, left to right –consistency - buttons & menus in the same place (on all screens/web pages) –consistent use of colour uncluttered screen layout: –too much information  disinterested user (short attention span) clear labels used, salient points obvious to gain attention use: –flashing text, pop-up messages, sounds, …..

9. Memory long-term, short-term & physical memories used an interface may be used infrequently –so can’t rely on user remembering how to use system –  need to use links to pre-existing knowledge i.e. use user’s mental model  physical & short term memory will be involved –designer must ensure short term memory is used ‘keep it simple and recognisable’ To aid memory: screen layouts should be consistent & uncluttered use of colour should be consistent and sensible design should link to pre-existing knowledge

10. Learning user may not use the system often user may not have received training  system must be intuitive Try to use: uncluttered screen layout group items on screen –so layout matches way user works simplistic language on-screen help