1 Human Memory Don’t ask too much of mere mortals Material mainly from Dix et al chapter 1.

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Presentation transcript:

1 Human Memory Don’t ask too much of mere mortals Material mainly from Dix et al chapter 1

2

3

4 Learning outcomes Describe the major categories of human memory Describe the major organization structures of long term memory How are these organization structures reflected in UI design

5 Memory There are three main types of memory function: Sensory memories Short-term memory or working memory Long-term memory Selection of stimuli governed by level of ‘arousal’ (our level of interest or need).

Think about What this means for HCI –? –We will come back to this at the end of the lecture 6

7 Sensory memory Buffers for stimuli received through senses –iconic memory: visual stimuli –echoic memory: aural stimuli –haptic memory: tactile stimuli Examples –“sparkler” trail –stereo sound Continuously overwritten

8 Short-term memory (STM) Scratch-pad for temporary recall –rapid access ~ 70ms –rapid decay ~ 200ms –limited capacity - 7± 2 chunks Some research suggests that programmers have better short-term memory than ‘average’ people –This means you will have better short-term memory than your users!

9 A Chunk is 1 item in short term memory HEC ATR ANU PTH ETR EET Microsoft product keys

10 Long-term memory (LTM) Repository for all our knowledge –slow access ~ 1/10 second –slow decay, if any –huge or unlimited capacity Two dominant types of access structure –episodic– serial memory of events –semantic– structured memory of facts, concepts, skills semantic LTM derived from episodic LTM

11 Long-term memory (cont.) Semantic memory structure –provides access to information –represents relationships between bits of information –supports inference Model: semantic network –inheritance – child nodes inherit properties of parent nodes –relationships between bits of information explicit –supports inference through inheritance

the human 2 of 3 12 LTM - semantic network Takes more time to answer ‘Does a collie breathe?’ than ‘Does a hound hunt?’

13 Models of Long Term Memory - Frames Information organized in data structures Slots in structure instantiated with values for instance of data Type–subtype relationships DOG Fixed legs: 4 Default diet: carniverous sound: bark Variable size: colour COLLIE Fixed breed of: DOG type: sheepdog Default size: 65 cm Variable colour

the human 2 of 3 14 Models of LTM - Scripts Model of stereotypical information required to interpret situation Script has elements that can be instantiated with values for context Script for a visit to the vet Entry conditions:dog ill vet open owner has money Result:dog better owner poorer vet richer Props:examination table medicine instruments Roles:vet examines diagnoses treats owner brings dog in pays takes dog out Scenes:arriving at reception waiting in room examination paying Tracks:dog needs medicine dog needs operation

the human 2 of 3 15 Models of LTM - Production rules LTM is not only ‘facts’ it is also ‘rules’ Representation of procedural knowledge. Condition/action rules if condition is matched then use rule to determine action. IF dog is wagging tail THEN pat dog IF dog is growling THEN run away

16 LTM - Storage of information rehearsal –information moves from STM to LTM total time hypothesis –amount retained proportional to rehearsal time distribution of practice effect –optimized by spreading learning over time structure, meaning and familiarity –easier to remember things that makes sense to us

17 LTM - Forgetting decay –information is lost gradually but very slowly (if at all – at least for things we’ve learned reasonably well – maybe we just lose facility for retrieving it) interference –new information replaces old: retroactive interference –old may interfere with new: proactive inhibition

18 LTM - retrieval recall –Reproducing information from memory can be assisted by cues, e.g. categories, imagery recognition –The presented information gives knowledge that it has been seen before –Less complex than recall – presented information is cue spatial –Strong memory of where things are relative to other things

19 Applying this to your learning Mind maps Pre-read Take notes Revise Look for connections between subjects

What does this mean for HCI? Have you learnt anything new today? What this means for HCI: –Menus versus command-line parameters –Passwords (easy or secure) –Interruptions (e.g. modal dialogues, animations) –Consistency (esp. in layout) –More? 20

21 Learning outcomes Describe the major categories of human memory Describe the major organization structures of long term memory Describe how UI designs can make remembering easier