Learning by analogy: cerebral bases

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Presentation transcript:

Learning by analogy: cerebral bases Dr Emmanuelle Volle – Dr Sam Gilbert – Pr Paul Burgess UCL - Institute of Cognitive Neuroscience Pr Marty Sereno – BUCNI Pr Bruno Dubois – INSERM U610

NEW KNOWN Periods of the task knowing effect Source Target Source Objective: Neural correlates of different analogy processes by separating source and target periods in new and known trials Periods of the task knowing effect NEW KNOWN Source Target … General concept Mapping Source General concept… apply Target

NEW KNOWN Source Target Source Target Instruction Source set alone Time of a trial Instruction 3 sec Source set alone Random 3 - 6 sec Source & Target sets Self paced- max 8,5 sec Example of a trial displayed on a screen Scale of a trial Fbck 0.5s ITI 0.7s Scale of a whole session: knowing effect NEW Source Target … General concept Mapping Source General concept… apply Target KNOWN

NEW KNOWN Instruction Source set alone Source & Target sets BLOCK1 Time of a trial Instruction 3 sec Source set alone Random 3 - 6 sec Source & Target sets Self paced- max 8,5 sec Scale of a trial Fbck 0.5s ITI 0.7s Scale of a whole session: knowing effect A BLOCK = 42 trials: 14 Cross+14 Intra+14 Match Random: C-I-C-M-I-C-M-I-C-I-M-M-C-M-I-I-… NEW 14 IntraA 14 CrossA 14 Match BLOCK1 Source / Target BLOCK2 Analogy / Control BLOCK3 New / Known 14 IntraA 14 CrossA 14 Match BLOCK4 KNOWN X 16 whole brains of Healthy Subjects Mean total duration < 40 min 14 trials X 3 tasks X 4 blocks

Pilot study (n = 12) Performances Reaction time Self confidence Analogy Match NS

Protocol logic? Testing group Control group 2 3 Instruction and training 1 Performance of ANALOGIES Learning evaluation 28 patterns logic? 14 intra 14 cross + 14 cont Control group Instruction and training 1 7

Design Same 7 concepts 14 intra 14 cross + 14 cont BLOCK1 BLOCK2 Abstract concepts -Symmetry around the middle -Linear increase/progression -Mirror image -Sum/combination -Proportion/multiplication -First is different from others -Subtraction For each concept per bloc: -2 analogies “intradomain” -2 “cross domain” with at least one new dimension Counterbalanced blocs between subjects

Concept learning evaluation Testing group 23,25/28 N = 12 Learning evaluation 28 patterns Ttest P < 0,0003 logic? Control group 15,17/28 N = 12 9

fMRI sequence TR 2500 ms TE 40 ms Voxel 3.5X3.5X3.5 33 interleaved slices