Laws of Human Performance ECE 695 Alexander J

“Laws” of Human Performance ECE 695 Alexander J. Quinn January 24, 2018

Miller’s Law Memory span is limited to 7 ± 2 chunks n “Memory span” is the number of items a person can remember for short periods of time and repeat back correctly n “Chunks” are the mental units we use to remember things. You saw this previously in the Model Human Processor paper.

Miller’s Law 765 494 3483 ↓ 765 494 3 4 8 3

Miller’s Law 346 789 2102 ↓ ? ? (depends on the person)

Miller’s Law 3. 14159265 35897932 Miller’s Law relates to 38462643383 2795028841971693993 7510582 09749445923078164062862089986 short-term memory 2803482534211706798214808651328230664709384460 95505822317253594081284811174502841027019385211055596446 (Memorizing digits of PI is long-term memory. ) 229489549303819644288109756659334461284756482337867831652 712019091456485669234603486104543266482133936072602491412737245 87006606315588174881520920962829254091715364367892590360 011330530 5488204665213841469519415116094330572703657595919530921861173819326117931 0511854807446237996274956735188575272489122793818301194912983367336244065 6643086021394946395224737190702179860943702770539217176293176752384674818467669405132 00056812714526356082778577134275778960917363717872146844090122495343014654958537105079 22796892589235420199561121290219608640344181598136297747713099605187072113499999983729 78049951059731732816096318595024459455346908302642522308253344685035261931188171010003 13783875288658753320838142061717766914730359825349042875546873115956286388235378759375 195

Miller’s Law Short-term memory (not long-term) p Chunks may be person-specific p May vary depending on… p n n kind of chunk age person trial

Hick’s Law How long does it take to choose among n choices? Credit: https: //www. zomato. com/toronto/five-guys-brampton-gta/menu

Hick’s Law dbultiores 2. hervajoycl 3. ydompefula 4. calorincus 5. dibloganto 6. larithanex 7. lopremites 8. oryphardic 9. rcillouste 10. rflethochn 11. trisopanam 1. 12. utiongernh 23. iterephyar 13. ailludietf 24. liginaterr 14. andrefusen 25. mpustinicu 15. aryondiend 26. onteredrax 16. coliterity 27. oureashall 17. ctaindroar 28. rashinesgr 18. egookerlin 29. riveyeator 19. endesomale 30. somporthem 20. fertiveruc 31. sycedreadl 21. groafterig 32. triyanatep 22. ialtsonett 33. untibberna Credit: https: //www. zomato. com/toronto/five-guys-brampton-gta/menu

Hick’s Law 1. 2. 3. 4. 5. 6. kadandicon minianetil nobsonoedy opoilimpad rfressisha scantontra Credit: https: //www. zomato. com/toronto/five-guys-brampton-gta/menu

Hick’s Law for making choices p

Hick’s Law Credit: https: //www. zomato. com/toronto/five-guys-brampton-gta/menu

Fitts’ Law A W

Fitts’ Law A W Credit: Paul M Fitts, Journal of Experimental Psychology, Vol 47 No 6, June 1954

Fitts’ Law A W p

Fitts’ Law A W p

Fitts’ Law p

Fitts’ Law, derivation A W p n is the number of time steps needed to complete the full movement. Credit: http: //www. inf. ed. ac. uk/teaching/courses/hci/1011/lecs/fitts. pdf

More… Power Law of Practice p Forgetting curve p Sensitivity to delay p See resources page on web site