The human 2 of 3 1 The Human 2 of 3. the human 2 of 3 2.

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Presentation transcript:

the human 2 of 3 1 The Human 2 of 3

the human 2 of 3 2

3

4 the human Human 1 Information i/o … visual, auditory, haptic, movement Human 2 (today) –Information stored in memory sensory, short-term, long-term Human 3 –Information processed and applied reasoning, problem solving, skill, error –Emotion influences human capabilities –Each person is different

the human 2 of 3 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.

Think about What this means for HCI –? –We will come back to this at the end of the lecture the human 2 of 3 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

the human 2 of 3 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!

the human 2 of 3 9 A Chunk is 1 item in short term memory HEC ATR ANU PTH ETR EET Microsoft product keys

the human 2 of 3 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

the human 2 of 3 11 Interesting trivia Mega memory techniques –Combine episodic and semantic Experienced programmers –Use chunked techniques that they have used before to solve problems –They decompose the problem into bigger chunks than a novice programmer –Then apply known solution to each chunk –Takes about 10 years to build up repertoire

the human 2 of 3 12 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 13 LTM - semantic network

the human 2 of 3 14 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 15 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 16 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

the human 2 of 3 17 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 –information easier to remember

the human 2 of 3 18 LTM - Forgetting decay –information is lost gradually but very slowly interference –new information replaces old: retroactive interference –old may interfere with new: proactive inhibition so may not forget at all memory is selective … … affected by emotion – can subconsciously `choose' to forget

the human 2 of 3 19 LTM - retrieval recall –information reproduced from memory can be assisted by cues, e.g. categories, imagery recognition –information gives knowledge that it has been seen before –less complex than recall - information is cue

the human 2 of 3 20 Applying this to your learning Mind maps Pre-read Take notes Revise Look for connections between subjects

What does this means for HCI Have you learnt anything new today? What does this mean for hci? –? the human 2 of 3 21