1 Dyscalculia: Why do numbers make no sense to some people? Dr. Anna J. Wilson Research Fellow Department of Psychology University of Auckland
2 My background BSc, The University of Auckland (Psychology) Exchange to University of California, Berkeley PhD, University of Oregon (Psychology) Dissertation: Numerical & spatial cognition Supporting area: Math learning disabilities Postdoctoral fellowship, INSERM U562, Paris Development & testing of remediation software for dyscalculia (with Stanislas Dehaene) Research fellow, University of Auckland Neural correlates of dyscalculia & relationship between dyscalculia & dyslexia (with Karen Waldie)
3 PhD, University of Oregon Dissertation: Numerical & spatial cognition Supporting area: Math learning disabilities Postdoctoral fellowship, INSERM U562, Paris Development & testing of remediation software for dyscalculia (with Stanislas Dehaene) Research fellow, University of Auckland Neural correlates of dyscalculia & relationship between dyscalculia & dyslexia (with Karen Waldie)
4 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
5 Developmental dyscalculia Severe difficulty in mathematics presumed to be due to a specific impairment in brain function Also called Mathematics Disorder (DSM-IV), or mathematical learning disabilities Prevalence: around 6% (same as dyslexia!) Has genetic component (runs in families) Understudied compared to dyslexia Kosc, 1974; Shalev & Gross-Tsur, 2001; Geary, 1993, 2004; Badian, 1983; Lewis, Hitch, & Walker, 1994
6 Surface symptoms Delay in acquisition of: Counting 3 x 2 = 3 x 3 = 3 x 4 = Addition strategies (counting on vs. counting all) Memorization of number facts (e.g. times tables) Geary (1993, 2004) - review Difficulties with story problems? (e.g. Nancy Jordan s research) - esp. when dyslexia present! =? Counting all Counting on Counting on (max)
7 Core cognitive symptoms Difficulty representing quantity ( number sense ). Slow to compare numbers (Llanderl et al., 2004) Slow to enumerate 1-3 objects ( subitizing ) (Reeve et al., in press) Number symbols processed less automatically Number stroop task (Rouselle & Nöel, 2007; Rubinsten & Henik 2005) Mental number line slow to develop
8 Some examples Llanderl, Bevan & Butterworth, Note that the impairment is in response time as well as accuracy
9 Llanderl, Bevan & Butterworth,
10 Mental number line development 0 "Put a mark where 64 goes" 100 Siegler & Booth, 2004 Individual differences on this task correlate with maths achievement scores.
11 Mental number line in dyscalculia 0 "Put a mark where 64 goes" 100 a) Number placement at T1: number line 100 b) Number placement at T1: number line Mean estimated magn nitude Dyscalculic Control Actual magnitude itude Mean estimated magni Dyscalculic 100 Control Actual magnitude Wilson, Krinzinger, Nuerk, Dehaene & Willmes, in prep
12 Likely other symptoms Difficulty with: Subtraction Using finger counting (slow, inaccurate, trouble recognising finger configurations) Decomposing numbers (e.g. recognizing that 10 is made up of 4 and 6) Understanding place value Learning/understanding multi-step calculation procedures and problem solving Anxiety about or negative attitude towards maths
13 Consequences in adults Blocked from certain professions (lower salary) Difficulty managing money Difficulty understanding statistics/numbers (influence on decision making) Low self-esteem, anxiety, avoidance I have always had difficulty with simple addition and subtraction since young, always still have to count on my fingers quickly e.g. 5+7 without anyone knowing. Sometimes I feel very embarrassed! Especially under pressure I just panic.
14 Consequences in adults I struggled through school with maths to the point the teachers gave up on me. I can only count on my fingers or with a calculator. I can't count out change, no matter how small and often get flustered with any tasks involving numbers. Despite trying hard I could never remember my 'times tables'. Division etc just bewildered me totally. English was one of my best subjects at school. I have no trouble whatsoever reading or writing, understanding literary concepts and theories etc., but spend an hour sitting in the bank trying to work out how much money is in my cheque account! Last year I returned to University, attempting to avoid any papers containing mathematics, but hidden in nearly everything are formulas and calculations.
15 Co-morbid difficulties Both verbal and non-verbal: Dyslexia (50%) ADHD (30%) Dyspraxia Spatial difficulties Why is there such a high association between these disorders?? What is the implication for remediation?
16 The big questions What causes dyscalculia? How can it be indentified early? Can it be prevented? What is the best type of remediation? Why does it co-occur so often with other learning disabilities? Are there subtypes; if so do they need different remediation approaches? In order to answer these we need to know about how maths works in the brain.
17 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
18 Numerical cognition Study of representation of number in the brain Methods: Animals, infants, cross-cultural linguistics, brain imaging, cognitive psychology Good introductory books: Stanislas Dehaene
19 Mathematics is componential Non-verbal number, approximation, comparison Verbal number facts (multiplication, addition) Logical problem solving, higher maths Spatial geometry? Number line?
20 Non-verbal bases of number Number is not constructed or dependent on logic/language as Piaget thought Animals can add, subtract, compare quantities! As can pre-verbal human infants... Platt & Johnson (1971). Rats taught to press button a certain number of times for reward. Mode at the right value, but responses approximate.
21 Approximate number: Demonstration Which side has more dots?
27 Ratio = 0.5 Faster, more accurate Ratio = 0.79 Slower, less accurate
28 Approximate number Ability to discriminate depends on ratio of the two numbers. This "distance effect" is found in animals, and human adults and children. e.g. see Brannon (2003) for review
30 12 24
32 19 24
34 Ratio = 0.5 Dots: faster, more accurate Digits: the same!! Ratio = 0.79 Dots: slower, less accurate Digits: the same!!
35 Approximate number Ability to discriminate depends on ratio of the two numbers. This "distance effect" is found in animals, and human adults and children. e.g. see Brannon (2003) for review
36 Approximate arithmetic Barth (2005) Five year old children
37 Approximate number What have we learned about it so far? Non-verbal Non-symbolic Present in animals / human infants Still accessed in skilled adults Used for representation and operations Next: Has a specific brain basis
38 Number sense Number sense is a short-hand term for our ability to quickly understand, approximate, and manipulate numerical quantities. (Dehaene, 2001) Caution: term used in different ways in education (vs. in numerical cognition) see Berch, 2005 review
39 Number sense in adults Using number sense activates the intraparietal sulcus (IPS): (This same area is involved in thinking about space.) Left hemisphere Axial slice Right hemisphere x = - 48 z = 44 z = 49 x = % HIPS 22 % Tasks that activate this region: Comparison of numbers Subtraction Approximation Estimation e.g. comparison Non-symbolic tasks Automatically activated by viewing numbers Dehaene, Piazza, Pinel, & Cohen (2003)
40 Neurons & approximate number The distance effect shows up in responses of neurons Areas that respond to a change of numerosity 0.4 % of activation to a number of dots after a adaptation period 0.4 Nieder & Miller, 2004 % d activation Weber fraction Weber fraction Ratio / target Ratio / target Piazza, 2004
41 Number sense in children Neural correlates the same as in adults. Non symbolic tasks Cantlon, Brannon, Carter & Pelphrey 2006 fmri in 4 year olds
42 Mathematics is componential Non-verbal Intraparietal sulcus (IPS) number, approximation, comparison Verbal Perisylvian language network number facts (multiplication, addition) Logical problem solving, higher maths Spatial geometry? Number line? Frontal lobes? Parietal lobes?
44 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
45 Causes of dyscalculia "Core deficit" hypothesis: Deficit in number sense (Butterworth, 1999; Gersten & Chard, 1999; Wilson & Dehaene, 2007) left hemisphere right hemisphere quantity quantity verbal "six" visual 6 visual 6 Dehaene, S. (1992). Cognition, 44, Dehaene, S., & Cohen, L. (1995). Mathematical Cognition, 1,
46 Brain bases of dyscalculia Dyscalculic children - less grey matter in Dyscalculic adults born pre-term IPS (Rotzer et al., 2008) less gray matter in IPS (Isaacs, Edmonds & Lucas, 2001) Controls Superimposed images of sulci Turner subjects Dyscalculic children less activation in IPS during magnitude tasks (Kucian et al., 2006) Molko, Cachia and Riviere (2004) Turners subjects - structural and functional alternations in IPS.
47 Causes of dyscalculia "Access" hypothesis : Deficit in link between number sense and symbols (Rouselle & Nöel, 2007) "Core deficit" hypothesis: Deficit in number sense (Butterworth, 1999; Gersten & Chard, 1999; Wilson & Dehaene, 2007) left hemisphere right hemisphere verbal "six" quantity visual 6 quantity visual 6 Dehaene, S. (1992). Cognition, 44, Dehaene, S., & Cohen, L. (1995). Mathematical Cognition, 1,
48 One subtype proposal Number sense / number sense access Everything affected except counting, fact retrieval May have difficulty with non-symbolic tasks Verbal Difficulty with counting, fact retrieval, word problems Associated with dyslexia? Executive Difficulty with fact retrieval, use of strategy/procedure Associated with ADHD?? Spatial Difficulty with subitizing, apprehension of non-symbolic quantity mental number line? Wilson & Dehaene (2007)
49 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
50 The big questions What causes dyscalculia? How can it be indentified early? Can it be prevented? What is the best type of remediation? Why does it co-occur so often with other learning disabilities? Are there subtypes; if so do they need different remediation approaches?
51 Auckland comorbidity project Postdoctoral fellowship with Karen Waldie, funded by Univ. of Auckland. Phase I: 80 adults with dyscalculia, dyslexia, both or neither (20 per group) Cognitive testing (symptoms, subtypes) Brain imaging (fmri; neural markers) Phase II (if funded!): similar study in children
53 An aside... Many people mistakenly think that if it s in the brain it can t be changed Nothing could be more wrong! The brain is the basis of all learning Brain function and even structure is highly plastic, especially at a young age The mild impairments associated with learning disabilities are nothing like the brain damage caused by stroke/lesion
54 An example from reading... Fast ForWord (Merzenich et al., 2006; Tallal et al., 2006; Scientific Learning Corporation) Adaptive game software for reading Specific Language Impairment, Dyslexia Intensive individual intervention (1h/day for 12 wks) Temple et al. 2003
55 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
56 Identification Test for: Mathematics level (standardised test) e.g. PAT, Woodcock Johnson, WRAT, KeyMath Profile of performance in different components IQ (rule out general difficulties) Dyslexia, ADHD, spatial difficulties, dyspraxia if suspected Important to rule out: educational experiences, motivation
57 Profiling tests Ideally: Measurements of response time as well as accuracy. Separate breakdowns for different operations and components KeyMath (5-22 yrs) TEMA-3 (3-8 yrs) CMAT (7-19 yrs) Diagnostic mathematics profiles (AUS) Booker Profiles? (AUS)
58 Dyscalculia Screener (nfernelson) Brian Butterworth, University College London Computerised, for use in schools Number stroop Subitizing / Counting Mental arithmetic Administration time: 30 minutes Advantages: Precise measures including reaction time, standardised, fast Disadvantages: Assumes dyscalculia caused by core deficit in number sense
59 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
60 Individual remediation Focus on understanding (esp. quantity) Drilling of facts only useful up to a point Use concrete materials Start at an easy level (success important!) Provide lots of practice Reduce need for memorisation Ask a lot of questions to get the child engaged and thinking Make learning active and fun
61 How to help in the classroom Give children their own set of work, at their level Allow extra time Use written and verbal instructions and questions Extra scaffolding, especially for multi-step procedures Reduce opportunity for comparison with peers
62 What about subtypes? In the absence of a verdict from research a good way to approach subtypes is by using a componential analysis to plan remediation. e.g. If child is good at multiplication but has trouble with number sense, focus on number sense! If child has dyslexia and trouble with word problems, focus on reading/interpreting. Note that this necessitates a componential assessment
63 Remediation workbooks Dyscalculia Guidance by Brian Butterworth & Dorian Yeo. (2004). The Dyscalculia Toolkit: Supporting Learning Difficulties in Maths by Ronit Bird (2007). Dyscalculia: Action Plans for Successful Learning in Mathematics by Glynis Hannell. (2005). Dyslexia, Dyspraxia and Mathematics by Dorian Yeo. (2003). Mathematics for dyslexics including dyscalculia by Steve Chinn and Richard Ashcroft. (2007, 3rd Edn). The Trouble with Maths: A Practical Guide to Helping Learners with Numeracy Difficulties by Steve Chinn. (2004).
64 Software Bubble Reef by ICDC Number Shark by White Space To Market, To Market by Learning in Motion The Number Race by myself and Stan Dehaene Knowsley Woods by ICDC
65 The Number Race Adaptive game to remediate/teach early number sense Non-profit model ("open source" = free to obtain, copy, distribute, modify) Programmed by myself Wilson et al. 2007a,b Languages:
67 Research based instructional principles Enhance number sense intensive number comparison (e.g. largest of 3, 9?) speed deadline link between number and space Cement non-symbolic symbolic links repeated association of non-symbolic & symbolic numbers encourage increasing reliance on symbols Conceptualise and automatise arithmetic concrete representations of operations speed deadline Maximize motivation positive reinforcement difficulty adaptation entertaining format (game!)
68 Adaptive algorithm AI (artificial intelligence) module builds a model of children's "knowledge space" Presents problems on borders of knowledge (not too easy, not too hard) Tries to push these borders General: can be used for any task if learning dimensions known notation distance speed
69 Talk outline What is dyscalculia? Numerical cognition Causes of dyscalculia Auckland comorbidity project Identification Remediation The future
70 Future goals Identify children as young as possible and provide preventative intervention Why? Brain more "plastic" at young age Maths is highly cumulative Avoid negative experiences associated with failure Quicker and cheaper
71 Early identification Currently can do behavioural screening, either Non-symbolic in infancy Symbolic in kindergarten Can predict future performance from behavioural measures in kindergarten (e.g. Mazzocco & Thompson, 2005) But still have many false positives More work needed to develop measures
72 Future goals Identify genetic markers so we know which kids are at risk. Need to: find genes Need dyscalculic families! Identify neural markers. Need to: develop inexpensive and quick brain imaging techniques.
73 A copy of this presentation...can be found on: My website: (look under news ) Contact information:
74 References Badian, N. A. (1983). Dyscalculia and nonverbal disorders of learning. In H. R. Myklebust (Ed.), Progress in Learning Disabilities (Vol. 5, pp ). New York: Stratton. Barth, H., La Mont, K., Lipton, J., & Spelke, E. S. (2005). Abstract number and arithmetic in preschool children. PNAS, 102(39), Berch, D. B. (2005). Making sense of number sense: Implications for children with mathematical disabilities. Journal of Learning Disabilities, 38(4), Brannon, E. M. (2003). Number knows no bounds. Trends in Cognitive Sciences, 7(7), Butterworth, B. (1999). The mathematical brain. London: Macmillan. Cantlon, J. F., Brannon, E. M., Carter, E. J., & Pelphrey, K. A. (2006). Functional imaging of numerical processing in adults and 4-y-old children. PLoS Biology, 4(5), e125. Dehaene, S. (1992). Varieties of numerical abilities. Cognition, 44(1-2), Dehaene, S. (1997). The Number Sense: How the Mind Creates Mathematics. Oxford: Oxford University Press. Dehaene, S. (2001). Précis of the number sense. Mind and Language, 16, Dehaene, S., & Cohen, L. (1995). Towards an anatomical and functional model of number processing. Mathematical Cognition, 1(1), Dehaene, S., Piazza, M., Pinel, P., & Cohen, L. (2003). Three parietal circuits for number processing. Cognitive Neuropsychology, 20, Geary, D. C. (1993). Mathematical disabilities: Cognitive, neuropsychological and genetic components. Psychological Bulletin, 114(2), Geary, D. C. (2004). Mathematics and learning disabilities. Journal of Learning Disabilities, 37(1), Gersten, R., & Chard, D. (1999). Number sense: Rethinking arithmetic instruction for students with mathematical disabilities. The Journal of special education, 33(1), 18. Isaacs, E. B., Edmonds, C. J., Lucas, A., & Gadian, D. G. (2001). Calculation difficulties in children of very low birthweight: A neural correlate. Brain, 124(9), Kucian, K., Loenneker, T., Dietrich, T., Dosch, M., Martin, E., & von Aster, M. (2006). Impaired neural networks for approximate calculation in dyscalculic children: A functional mri study. Behavioral and Brain Functions, 2, 31. Kosc, L. (1974). Developmental Dyscalculia. Journal of Learning Disabilities, 7(3), Landerl, K., Bevan, A., & Butterworth, B. (2004). Developmental dyscalculia and basic numerical capacities: a study of 8-9-year-old students. Cognition, 93(2), Lewis, C., Hitch, G. J., & Walker, P. (1994). The prevalence of specific arithmetic difficulties and specific reading difficulties in 9- to 10-year old boys and girls. Journal of Child Psychology and Psychiatry, 35(2),
75 References cntd. Mazzocco, M. M. M., & Thompson, R. E. (2005). Kindergarten predictors of math learning disability. Learning Disabilities Research and Practice, 20(3), Merzenich, M. M., Jenkins, W. M., Johnston, P., Schreiner, C., Miller, S. L., & Tallal, P. (1996). Temporal processing deficits of language-learning impaired children ameliorated by training. Science, 271(5245), Molko, N., Cachia, A., Riviere, D., Mangin, J. F., Bruandet, M., Le Bihan, D., et al. (2003). Functional and structural alterations of the intraparietal sulcus in a developmental dyscalculia of genetic origin. Neuron, 40(4), Nieder, A., & Miller, E. K. (2004). A parieto-frontal network for visual numerical information in the monkey. PNAS, 101(19), Piazza, M., Izard, V., Pinel, P., Le Bihan, D., & Dehaene, S. (2004). Tuning curves for approximate numerosity in the human intraparietal sulcus. Neuron, 44, Rotzer, S., Kucian, K., Martin, E., Aster, M. v., Klaver, P., & Loenneker, T. (2008). Optimized voxel-based morphometry in children with developmental dyscalculia. NeuroImage, 39(1), Rousselle, L., & Noel, M.-P. (2007). Basic numerical skills in children with mathematics learning disabilities: A comparison of symbolic vs non-symbolic number magnitude processing. Cognition, 102(3), Rubinsten, O., & Henik, A. (2005). Automatic Activation of Internal Magnitudes: A Study of Developmental Dyscalculia. Neuropsychology, 19(5), 641. Shalev, R. S., & Gross-Tsur, V. (2001). Developmental dyscalculia. Pediatric Neurology, 24(5), Siegler, R. S., & Booth, J. L. (2004). Development of numerical estimation in young children. Child Development, 75(2), Tallal, P., Miller, S. L., Bedi, G., Byma, G., Wang, X., Nagarajan, S. S., et al. (1996). Language comprehension in language-learning impaired children improved with acoustically modified speech. Science, 271(5245), Temple, E., Deutsch, G. K., Poldrack, R. A., Miller, S. L., Tallal, P., Merzenich, M. M., et al. (2003). Neural deficits in children with dyslexia ameliorated by behavioral remediation: Evidence from functional mri. Proc Natl Acad Sci U S A, 100(5), Wilson, A. J., & Dehaene, S. (2007). Number sense and developmental dyscalculia. In D. Coch, G. Dawson & K. Fischer (Eds.), Human behavior, learning and the developing brain: Atypical development. New York: Guilford Press. Wilson, A. J., Dehaene, S., Pinel, P., Revkin, S. K., Cohen, L., & Cohen, D. (2006a). Principles underlying the design of the number race, an adaptive computer game for remediation of dyscalculia. Behavioral and Brain Functions, 2(19). Wilson, A. J., Revkin, S. K., Cohen, D., Cohen, L., & Dehaene, S. (2006b). An open trial assessment of the number race, an adaptive computer game for remediation of dyscalculia. Behavioral and Brain Functions, 2(20).
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Office of Disability Support Service 0106 Shoemaker 301.314.7682 Fax: 301.405.0813 www.counseling.umd.edu/dss A Guide to Services for Students with a Learning Disability (Revised 4.28.14) Do I Have A Learning
TM parent ROADMAP MATHEMATICS SUPPORTING YOUR CHILD IN KINDERGARTEN K America s schools are working to provide higher quality instruction than ever before. The way we taught students in the past simply