Thursday, May 15, 2014

Creating User Experiences: Fundamental Design Principles by Billy Hollis cont'd

Notes from Billy Hollis' course

Human visual system is optimized to see structure and relationships, leading to the gestalt principles
Common fate
Continuity and Closure (filling gaps)
Figure / ground

Stages of human visual processing
Stage One: processing inside the retina
small area of high res and color - where the person is focusing
Tuning to detect edges. 
Peripheral vision is tuned to detect movement.

Stage Two: "Preattentive" processing
Information from retina assembled into shapes and groups

Stage Three: "Attentive" processing
Stores of experience used to interpret the output of state two
Gestalt principles come from stage two
predisposition to interpret edges, shapes, and groups in certain ways - unconscious
Conscious interpretation can override the perceptions from stage two, but it takes cognitive work  - users don't like doing it.

"Don't Make Me Think" by Steve Krug

Most users will see this as 2 mutually exclusive columns of options, i.e. they think they can only pick one option from column 1, and one option from column 2.  Proximity is causing this, so be careful with it.








Objects that are similar override the proximity principle (to a degree), such that most people will see 4 rows of stars, not 5 columns:*5!billy-hollis_cux-designprinciples-module-04!billy-hollis_cux-designprinciples-module-00!billy-hollis_cux-designprinciples-module-01!billy-hollis_cux-designprinciples-module-02!billy-hollis_cux-designprinciples-module-03!billy-hollis_cux-designprinciples-module-06!billy-hollis_cux-designprinciples-module-07!billy-hollis_cux-designprinciples-module-05#cux-designprinciples-module-08*5!billy-hollis_cux-designprinciples-module-04!billy-hollis_cux-designprinciples-module-00!billy-hollis_cux-designprinciples-module-01!billy-hollis_cux-designprinciples-module-02!billy-hollis_cux-designprinciples-module-03!billy-hollis_cux-designprinciples-module-06!billy-hollis_cux-designprinciples-module-07!billy-hollis_cux-designprinciples-module-05#cux-designprinciples-module-08

 Color, Shape,  or Size can accomplish this overriding of proximity (size is least effective)
This can also be used for highlighting
Need to make sure the task the user is focused on is promoted by your software, or inattentional blindness may cause them to miss the thing you expect them to see.

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