In this talk, Claudio discusses how our human abilities, not technology, should define our digital experiences. He reveals how one should address the human-motor system, human vision, and cognitive abilities when designing those experiences.
- Neck flexion and neck extension: Head can move 30º backward and 45º forward comfortably. Similarly,
- Wrist flexion and wrist extension: 51º upward and 46º downwards
- Lateral backbend: 21º sideway
- Lateral neck bend: can move head sideway by 25º
- Ulnar and radial deviation: can move your palm sideways by 15º towards your thumb and 25º on the other side
- Shoulder abduction is 25º towards your body and 60º away from the body
- The above shows that no matter how fascinating the sci-fi movies showcase the futuristic User Interfaces, it's outside the human comfort zone to control everything with full and dramatic gestures
- Focus on increasing efficiency and accuracy of what we can do within a comfortable range
- Designers should not become personal trainers and train their customers
- For instance, Instagram only adheres to human-computer interaction guidelines for a minimum tappable area in navigation but not in inline comments, etc.
- How we can use this info at work
- Consider the direction and ranges that are more comfortable for repeated motion.
- Design for inaccuracy - make the system forgiving since humans will make mistakes.
- Use all information available to identify intent. Mix signals received and craft experiences accordingly.
Human vision-related abilities
- Humans recognize images in 1/200th of a second
- We have 120º binocular vision
- We have central vision 2º which is where we see things most clearly
- 900º angular speed which is responsible for content-aware fill
- Stereoscopic vision 120º: good at recognizing patterns
- 30º to recognize icons/ symbols
- Far peripheral vision - just survival skills/ motion identification, etc.
- How to use it in real life
- Know when to break the rules
- Focus the attention on the content
- Orchestrate your compositions, so the eyes know where to go using your central vision and peripheral skills to complement each other.
Human cognitive abilities:
- About 8 seconds of transient attention
- 20 seconds sustained attention
- 10-15 seconds working memory
- Humans can hold 5 - 9 discrete items at once
- Cognitive load is the total amount of mental effort being used by our working memory as we complete tasks or learn new things.
- Cognitive load is both an enhancing element of learning and an inhibitor for it.
- Intrinsic: how difficult something is
- Germane: the work put into creating a permanent store of knowledge
- Extraneous - how it is presented
- Leveraging relevant past knowledge stored in long-term memory facilitates our learning. For instance, a doctor who has performed the same operation hundreds of times can leverage to identify new insights.
- There are no limits to our learning capacity, but there is a progression to it.
- How to use this at work:
- Leverage user's previous knowledge to minimize content overload and ambiguity.
- Consider progressive disclosure and learning goals when using unique user interface paradigms.
- Nothing is impossible
- Everything can be learned.
- Abilities change over time.
Liked what you read? Share it with your friends and follow me on Twitter: @godgeez