1/26/23
Week THREE
How do font sizes, colors and contrast impact people from different groups?
This is an open question and depends on fads, fashions, how you define groups, and more.
Before color accurate displays were invented, how was color theory and perception of digital interfaces studied? Or is this a relatively new area of HCI research which came to the surface even more so after significant advances in display technologies
Color theory is pretty old and exists as a science separate from HCI. There have been two different approaches to color theory in the present century, a psychological approach and a physiological approach. As for its age, I know that Newton explored it over 300 years ago.
How do we plan to use framer in class? I’d be curious to hear other perspectives, will we have guest speakers?
Framer can be used in two ways in this course: to make a website and to make prototypes.
I don’t plan on any guest speakers but will entertain suggestions.
We talked a bit about cognitive psychology last week, particularly about Tversky and Kahneman’s work. This week we continue with some historical information.
basic, similar in all people, recoil from hot stove; input is immediate present, output is an affective state; not emotions but precursors to emotions; dismissed by people who don’t believe they are influenced by it;
learned skills, subconscious response to patterns; overall awareness but no conscious awareness of details, e.g., speaking, sports; conscious of goals while behavioral level handles details; actions are associated with expectations as well as outcomes and lead to affect, both before and after;
conscious cognition, deep understanding, reasoning, slow, guilt, pride, blame, admiration; design takes place at all three levels: high-level cognition can trigger low-level emotion just as low-level emotion can trigger high-level cognition;
Another way to think of these levels is illustrated in the previous frame: hardwired or prewired, short-term, and abstract or contemplative. All three levels play a role in our reactions to our environment, including designed artifacts.
Baby bubblehead, aka model human processor
Keystroke level model includes
GOMS stands for
protocol analysis \(\rightarrow\) think-aloud process
Protocol analysis was an early hci tool
verbal analysis \(\rightarrow\) knowledge representation
protocol analysis \(\rightarrow\) process map
verbal analysis \(\rightarrow\) knowledge map
Hick’s law predicts the time it will take for a user to make a choice, given the number of choices.
Hick’s law can be expressed as
\[t = b \log_2 (n + 1)\]
Fitts’s law was actually discovered by Paul Fitts in the 1950s, but has been applied to the use of mice and other pointing devices as well as screen layouts since. It is perhaps the most widely invoked theory in the world of human computer interaction, and is depicted in the next frame.
\[t = a + b \log_2\left(\frac{D}{W} + 1\right)\]
Readings last week include Johnson (2020): Ch 1–5
Readings this week include Johnson (2020): Ch 7–9, Norman (2013): Ch 2, 4
Let’s look at the Johnson book together, then the Norman book.
Milestone 0: Topic Idea
Can one person from each group report on theirs?
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