CBB 2012: Metamemory and evolutionary dynamics in cognitive processes

Cc73619dcb49fee030b89aca866e127d?s=47 suchow
April 04, 2012

CBB 2012: Metamemory and evolutionary dynamics in cognitive processes

Cc73619dcb49fee030b89aca866e127d?s=128

suchow

April 04, 2012
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  1. METAMEMORY & evolutionary dynamics in cognitive processes by Jordan Suchow

  2. <refrain>

  3. 1

  4. metamemory

  5. visual working metamemory

  6. it reflects both the existence and the precision of the

    underlying memories
  7. and people can use it to guide their selection of

    an item
  8. 2

  9. metamemory poses a problem for standard models of working memory

  10. random process of degradation

  11. {re}allocation

  12. </refrain>

  13. <1>

  14. metamemory

  15. what’s that? 1

  16. “I don’t remember.” 1

  17. “I’m not sure.” 1

  18. “Can you remind me of something?” 1

  19. “I can’t remember jack.” 1

  20. 1

  21. $ 1

  22. 1

  23. 1 standard visual working memory task:

  24. 600 ms Encoding 900 ms Retention Response screen 1

  25. +

  26. +

  27. +

  28. +

  29. + error (deg)

  30. 1 metamemory task #1:

  31. +

  32. +

  33. +

  34. +

  35. +

  36. +

  37. 1 error (deg)

  38. 1 (interleaved in random order.)

  39. +

  40. +

  41. +

  42. 1 either:

  43. +

  44. 1 or:

  45. +

  46. 1 the data:

  47. −3 −2 −1 0 1 2 3 0 100 200

    300 400 500 1 1 error (deg) 0 +180 -180 precision guess rate
  48. 1 1 precision guess rate 1 2 0 0.05 0.1

    0.15 0.2 0.25 ` 0% 10% 20% random best random best 2 items 1 item 3 items 1 2 0 2 4 6 8 10 12 14 16 18 20 0° 10° 15° 5°
  49. visual working metamemory exists

  50. it reflects both the existence and the precision of the

    underlying memories
  51. and people can use it to guide their selection of

    an item
  52. a second metamemory task: 1

  53. 600 ms Encoding 900 ms Retention Response screen 1, confidence

    ratings (arcs)
  54. +

  55. +

  56. +

  57. +

  58. +

  59. +

  60. the data: 1, confidence ratings (arcs)

  61. confidence rating (size of drawn arc, in degrees) 1, confidence

    ratings (arcs)
  62. performance on the task (error, in degrees) 1, confidence ratings

    (arcs)
  63. −3 −2 −1 0 1 2 3 0 100 200

    300 400 500 1 error (deg) 0 +180 -180 precision guess rate 1, confidence ratings (arcs)
  64. 1 precision guess rate 1 2 3 0 0.1 0.2

    0.3 0.4 1, confidence ratings (arcs) 1 2 3 0 5 10 15 20 25 small arc medium arc LARGE ARC small arc medium arc LARGE ARC
  65. visual working metamemory exists

  66. it reflects both the existence and the precision of the

    underlying memories
  67. where does it come from? 1

  68. let’s rule out some of the more possibilities: 1

  69. were some colors just easier to remember than others? 1

  70. (no.) 1 14.5° 14.6° 13.5° 14.2° 13.1° 14.3°

  71. were some locations just easier to remember than others? 1

  72. 1 (no.) 19.6° 21.5° 21.1°

  73. were some items allotted more of the resource than others?

    1/6 1/3 1/2 1
  74. 1/6 1/3 1/2 1

  75. approach: look for tradeoffs 1

  76. +

  77. +

  78. +

  79. +

  80. +

  81. +

  82. approach: look for tradeoffs 1

  83. 1 when 2nd response is good: when 2nd response is

    bad: precision of first response...
  84. 1 when 2nd response is good: 26.0° when 2nd response

    is bad: precision of first response...
  85. 1 when 2nd response is good: 26.0° when 2nd response

    is bad: 25.6° precision of first response...
  86. (same deal for all pairwise comparisons.) 1

  87. what does this all say about visual working memory?

  88. visual working metamemory exists

  89. it reflects both the existence and the precision of the

    underlying memories
  90. people can use it to guide their selection of an

    item
  91. and, importantly, they aren’t relying on differences in allocation, nor

    on the memorability of certain colors or locations
  92. </1>

  93. <refrain>

  94. 1

  95. metamemory

  96. visual working metamemory

  97. it reflects both the existence and the precision of the

    underlying memories
  98. and people can use it to guide their selection of

    an item
  99. 2

  100. metamemory poses a problem for standard models of working memory

  101. random process of degradation

  102. {re}allocation

  103. </refrain>

  104. <2>

  105. metamemory poses a problem for standard models of working memory

  106. model 1: a continuously-divisible resource, divided evenly among items 2

  107. 1 2

  108. 1/2 1/2 2

  109. 1/3 1/3 1/3 2

  110. 1/3 1/3 1/3 uh oh. 2

  111. fail. (can’t account for metamemory data.)

  112. model 2: a discrete “slot”-based resource, divided evenly among items

    2
  113. each participant has a fixed number of slots 2

  114. 4 2

  115. 1 <slot> <slot> <slot> <slot> 2

  116. 1 <slot> <slot> <slot> <slot> 2

  117. 1 <slot> <slot> <slot> <slot> 2

  118. 1/4 1 <slot> <slot> <slot> <slot> 2

  119. 0 2 1/4 1 <slot> <slot> <slot> <slot>

  120. 0 0 2 1/4 1 <slot> <slot> <slot> <slot>

  121. metamemory under this model? 2

  122. 3 cases: 2

  123. # of slots < n <slot> <slot> 0

  124. (# of slots ≥ n) && (evenly divisible) <slot> <slot>

    <slot>
  125. (# of slots ≥ n) && (~evenly divisible) <slot> <slot>

    <slot> <slot>
  126. uh oh. 2

  127. improve only in precision XOR guess rate 2

  128. fail. (can’t account for metamemory data.)

  129. 2 we need a new framework.

  130. the framework: a random process of degradation 2

  131. 1/3 1/3 1/3 2

  132. 1/4 1/3 1/3 2

  133. 1/6 1/5 1/3 2

  134. RIP 1/3 2 1/6

  135. RIP 1/3 2 1/6 yay.

  136. allows for the metamemory results.

  137. two particular instantiations, borrowed from the field of population genetics:

    2
  138. 2, pure death process time

  139. time RIP RIP RIP 2, pure death process

  140. time RIP RIP RIP 2, pure death process

  141. time RIP RIP RIP 2, pure death process

  142. time RIP RIP RIP 2, pure death process

  143. time RIP RIP RIP 2, pure death process

  144. time RIP RIP RIP 2, pure death process

  145. time RIP RIP RIP 2, pure death process

  146. time RIP RIP RIP 2, pure death process

  147. time RIP RIP RIP 2, pure death process

  148. time RIP RIP RIP 2, pure death process

  149. time RIP RIP RIP 2, pure death process

  150. Time step 1 102 Time step 1 10 100 1

    Number of stored items n=5 n=3 n=1 2, pure death process
  151. unlike real memory data 2, pure death process

  152. how can we keep the representations alive? 2

  153. {re}allocation 2, k-allele Moran process

  154. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process A B D E F G H I C
  155. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  156. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  157. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  158. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  159. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  160. time A B C D E F G H I

    t = 0 t = 1 t = 2 t = 3 t = 4 t = 5 C A B D E F G H I A B D E F G H I G B D G H I E I A G D G H I E I G D B D G H I E I G D I 2, k-allele Moran process
  161. 100 102 0 2 4 6 1 10 100 1000

    Time step Number of recalled items n=7 n=5 n=3 n=1 2, k-allele Moran process
  162. a random process of degradation can account for metamemory

  163. reallocation keeps memories alive for a long time

  164. these dynamics might account for capacity limitations

  165. </2>

  166. <refrain>

  167. 1

  168. metamemory

  169. visual working metamemory

  170. it reflects both the existence and the precision of the

    underlying memories
  171. and people can use it to guide their selection of

    an item
  172. 2

  173. metamemory poses a problem for standard models of working memory

  174. random process of degradation

  175. {re}allocation

  176. </refrain>

  177. by Jordan Suchow thanks.

  178. by Jordan Suchow thoughts?