New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

HFAC notes, 10/22 onwards

by: Alison Notetaker

HFAC notes, 10/22 onwards PSYC 340

Marketplace > George Mason University > Psychlogy > PSYC 340 > HFAC notes 10 22 onwards
Alison Notetaker
GPA 4.0

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

These are class notes starting from 22 October. They're copied from OneNote, in case there is any confusion regarding formatting.
Human Factors
Psychology, human factors, HF, HFAC
75 ?




Popular in Human Factors

Popular in Psychlogy

This 11 page Bundle was uploaded by Alison Notetaker on Tuesday February 2, 2016. The Bundle belongs to PSYC 340 at George Mason University taught by Figueroa in Fall 2015. Since its upload, it has received 19 views. For similar materials see Human Factors in Psychlogy at George Mason University.


Reviews for HFAC notes, 10/22 onwards


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 02/02/16
10/22    emember to go look at the lecture from Bed 10/20!! Slumber Nap Awake Wake   Snooze Blanket  eview: Peace Modal model: Murdock, 1974 Yawn  Sensory Dream  STM  LTM Iconic: 200-400 milliseconds Echoic: Retain 33% Working memory 7 +/- 2, ideal conditions 4-5    5 or so items  20 seconds LTM  Declarative (conscious) o Semantic o Episodic  Nondeclarative (unconscious) o Procedural o Priming o Conditioning  Pair/associate unrelated stimulus/response o Nonassociative Habituation (for that one instance)  Properties of attention:  Selective  Limited (and not always driven by consciousness) Ebbinghaus- nonsense syllables  Decays quickly, then plateaus Primacy/recency effects Pavio: recall pictures, concrete words, abstract words  Recalled in that order of accuracy Jenkins/Dallenbach  Sleep after learning  Stay awake and read newspaper Repetition alone doesn't help form strong long-term memories Context in which you learned --> context in which you recall Ok so super review:  Primacy/recency  Concrete vs abstract  Match context for enviro of learn/recall OK so perception!! Do we percceive the envro exactly as it is? (no) Sensation: imprint of enviro on nervous system; stim on sensory receptors Perception: conscious exper of stim; process of interp/understanding sensory info Infl perception:  Enviro o Like the light from above heuristic  Knowledge o Top-down processing: perception influenced by higher-level knowledge  Perceptual system o Singular feature: red square amongst blue squares o (high saliency) Gestalt: part of atomism- whole obj greater than sum of parts  Perceptions greater than sum of scene's parts  Perceive some stim as background and some as obj of interest (dep largely on context)  Mind automatically orders info in a way that's common, orderly, symmetric, simple  Principles: o Closure (like the shapes) o Common fate (move in the same direction, related). Like labelling o Symmetry (symmetrical elements perceived to belong together, and vice versa) o Proximity (objs close together perceived to belong together) so ------ vs --- --- o Continuity (mind continues patterns) so the plane flew behind the rectangle! But nah o Similarity: groups similar objs together  Observations, but didn't specify how the mind perceives  We wanna know how the mind works! Parallel: knowledge to LTM, perception to working, enviro to sensory mem Can we trust perception? --> what 33% goes through sensory memory to STM/WM?  Attention  Early filters: btwn sensory mem and STM  Attention is not always consciously directed Dichotic listening  If filters are early, why can ppl switch ears (when lang switches)  So can we have a late filter? Can some of the attn be unconscious? Corteen & Wood- conditioned ppl by shocking whenever naming a city  Galvanic skin response (GSR) --> city name presented, gsr readings  So then they did a dichotic listening task where shadowed book in attended ear. In the unattended ear they heard french but mixed in were city names. Pts couldn't recall any of the city names from unattended ear, but GSR  --> some info unconsciously gets through the early filter  --> some evidence for possibility of subliminal messaging LTM store  How we categorize info is impt bc of how cats infl our mem  Episodic 10/27 Vigilance decrement- decreases as time goes on 11/12     User experience (UX) Usability- quality attribute of the UI, covering whether it's easy to learn and efficient to use Affordance is high when the way something's intuitively perceived matches how it's actually operated Heuristic evaluation- 1+ HFAC pros look at product/system, attempt to apply known principles of usability to make recs for its improvement Heuristics used when exhaustive process inefficient or impractical  Allen wrench: don't ID exact size but pick a couple candidates Conduct heuristic eval:  Select evaluators  Familiarize them w heuristics and product  Have evaluators interact in some way  Utilize heuristics to ID potential usability probs (only ID, though)  Aggregate evaluators' findings o critical  ID unique probs  Rate severity  ypes of evaluators:  Novice o No knowledge of usability principles or product  Expert o Usability experience  "double expert" o Experienced in usability testing and the particular domain the product pertains to  Usability experience is more impt than domain familiarity Find a competitor app from first proj  Get familiar w it 2 tasks for evaluators to attempt. Choose 4/9 heuristics to evaluate Select 5 evaluators, familiarize w heuristics and gen app function, have perform 2 tasks. Utilize heuristics to ID issues Aggregate ID probs (top 3-5) and conclusions Writeup: 1 Remind of app idea, which competitor and why 2 Tasks, evals, heuristics chosen and why 3 Results: qual/quant 4 Conclusions and recommendations 5 Appendix: table of results 6 2-3 pages max, 4-5 ppl including self. No cover page. Due 12/1 11/19 Task analysis- method for designers interested in efficiency: reducing job to series of tasks/subtasks Goals: 1 Understand steps to complete task 2 Understand goals of each step/substep 3 Determine whether products are used as intended 4 Gather data about product use for future design Benefits: 1 When designers are close to a design it's difficult to objectively evaluate it 2 Useful to systematically review products and systems to find areas where HFAC might be poor Task simulation- make estimates about task performance to test for HFAC concerns or compare btwn systems to facilitate design decisions  Simulations of environments: so ppl don’t have to experience real thing (eg earthquakes)  Simulations of people: estimate how we think ppl would act in a given (often dangerous) situation Why simulate and not experiment? 1 Cost 2 Speed 3 Safety Keystroke level modeling: simplified version of GOMS  Time-based Advantages: 1 Quick 2 Cheap 3 Pretty effective Disadvantages: 1 Requires knowledge of task times 2 Doesn't consider human error (what if someone misspells something?) 3 Expertise may change predictions 12/1 Advantages of prototyping  Prototyping allows testing when no product currently exists o Ability to experience/interact with artifact  Allows testing to repeat and evolve o Scientific method  Allows storage of info re: work in progress o Like a storyboard. Show how it's going to work Paper prototypes Virtual prototypes  High fidelity prototypes  So like using powerpoint and link to where the user would click Physical prototypes Abstract prototypes  Like the map of movie recommendations for netflix Storyboarding Video prototypes  Starfire  Show someone using the product 12/3 Usability testing- method to find usability probs during design cucle and determne how well ppl will be bale to use a prod or system before release 5 hallmarks:  Goal is to improve usability  Participants should rep real users  Incorps realistic tasks  Obs taken  Diagnoses skdfjsdlkfk Differences between UT and experimental research  Selected differently (not randomly!)  Fewer variables are controlled  Casual observations given more weight  Analysis of data handled differently Usability testing steps  Finding potential problems o Product evaluations o Beta testing o Heuristic evaluation by HF psychologist o Concurrent task analysis (casual, audiotape, videotape) o Applied cognitive task analysis (ACTA) o Retrospective task analysis o Eye tracking  Usability test o Paper prototyping o Virtual prototyping o Selecting participants for testing o Selecting scenarios for tests o Choosing locations for tests o Determining dependent measurements o Running the test Creating usability scenarios:  Tells a participant what you want them to do during your test. Tells context behind the task; gives a story. Imagine you used this and it wasn't very good, and you want to leave a review. Please post a review on this app. o Short, but enough context to be meaningful o Unambiguous/in plain language that avoids jargon o Test a combo of tasks, some designed for objective measurements, some for subjective, some for both  Tasks that probe potential usability probs  Tasks suggested from your concerns and experiences  Sdfkjsdlkf  Sakdfjksdjf  Limitations on tasks: o Time o Task ordering/fatigue effects 12/8: exam review KLM:  Is a form of task analysis! Prototyping:  Types: Paper, video, storyboard, virtual, abstract, physical Protocol Techniques:  One disadv of concurrent verbal protocol: distract from task, unnatural  One disadv of retrospective probing: justify, based on memory  Retrospective probing, concurrent verbal protocol (think-aloud) Usability:  Prior to usability testing, find probs using heuristics, product evals, beta testing, concurrent task analysis, eye tracking  Pts selected differently, fewer controlled vars, casual obs given more weight, analysis handled differently (than in laboratory testing)  Fatigue: shorter tasks, order effects: counterbalance Heuristic Evaluations/Affordance:  3-5 evals can ID about 80% of usability probs  Cog psych explains affordance theory as being byproducts of declarative and nondeclarative memory False Perceptible affordance affordance Correct Hidden affordance rejection


Buy Material

Are you sure you want to buy this material for

75 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Kyle Maynard Purdue

"When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the I made $280 on my first study guide!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.