@article{KucianZuberKohnetal.2018, author = {Kucian, Karin and Zuber, Isabelle and Kohn, Juliane and Poltz, Nadine and Wyschkon, Anne and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Relation Between Mathematical Performance, Math Anxiety, and Affective Priming in Children With and Without Developmental Dyscalculia}, series = {Frontiers in psychology}, volume = {9}, journal = {Frontiers in psychology}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-1078}, doi = {10.3389/fpsyg.2018.00263}, pages = {13}, year = {2018}, abstract = {Many children show negative emotions related to mathematics and some even develop mathematics anxiety. The present study focused on the relation between negative emotions and arithmetical performance in children with and without developmental dyscalculia (DD) using an affective priming task. Previous findings suggested that arithmetic performance is influenced if an affective prime precedes the presentation of an arithmetic problem. In children with DD specifically, responses to arithmetic operations are supposed to be facilitated by both negative and mathematics-related primes (= negative math priming effect). We investigated mathematical performance, math anxiety, and the domain-general abilities of 172 primary school children (76 with DD and 96 controls). All participants also underwent an affective priming task which consisted of the decision whether a simple arithmetic operation (addition or subtraction) that was preceded by a prime (positive/negative/neutral or mathematics-related) was true or false. Our findings did not reveal a negative math priming effect in children with DD. Furthermore, when considering accuracy levels, gender, or math anxiety, the negative math priming effect could not be replicated. However, children with DD showed more math anxiety when explicitly assessed by a specific math anxiety interview and showed lower mathematical performance compared to controls. Moreover, math anxiety was equally present in boys and girls, even in the earliest stages of schooling, and interfered negatively with performance. In conclusion, mathematics is often associated with negative emotions that can be manifested in specific math anxiety, particularly in children with DD. Importantly, present findings suggest that in the assessed age group, it is more reliable to judge math anxiety and investigate its effects on mathematical performance explicitly by adequate questionnaires than by an affective math priming task.}, language = {en} } @misc{KucianZuberKohnetal.2018, author = {Kucian, Karin and Zuber, Isabelle and Kohn, Juliane and Poltz, Nadine and Wyschkon, Anne and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Relation between mathematical performance, math anxiety, and affective priming in children with and without developmental dyscalculia}, series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {684}, issn = {1866-8364}, doi = {10.25932/publishup-46067}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-460671}, pages = {15}, year = {2018}, abstract = {Many children show negative emotions related to mathematics and some even develop mathematics anxiety. The present study focused on the relation between negative emotions and arithmetical performance in children with and without developmental dyscalculia (DD) using an affective priming task. Previous findings suggested that arithmetic performance is influenced if an affective prime precedes the presentation of an arithmetic problem. In children with DD specifically, responses to arithmetic operations are supposed to be facilitated by both negative and mathematics-related primes (= negative math priming effect). We investigated mathematical performance, math anxiety, and the domain-general abilities of 172 primary school children (76 with DD and 96 controls). All participants also underwent an affective priming task which consisted of the decision whether a simple arithmetic operation (addition or subtraction) that was preceded by a prime (positive/negative/neutral or mathematics-related) was true or false. Our findings did not reveal a negative math priming effect in children with DD. Furthermore, when considering accuracy levels, gender, or math anxiety, the negative math priming effect could not be replicated. However, children with DD showed more math anxiety when explicitly assessed by a specific math anxiety interview and showed lower mathematical performance compared to controls. Moreover, math anxiety was equally present in boys and girls, even in the earliest stages of schooling, and interfered negatively with performance. In conclusion, mathematics is often associated with negative emotions that can be manifested in specific math anxiety, particularly in children with DD. Importantly, present findings suggest that in the assessed age group, it is more reliable to judge math anxiety and investigate its effects on mathematical performance explicitly by adequate questionnaires than by an affective math priming task.}, language = {en} } @misc{KohnRauscherKucianetal.2020, author = {Kohn, Juliane and Rauscher, Larissa and Kucian, Karin and K{\"a}ser, Tanja and Wyschkon, Anne and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Efficacy of a Computer-Based Learning Program in Children With Developmental Dyscalculia}, series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {650}, issn = {1866-8364}, doi = {10.25932/publishup-47415}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-474159}, pages = {16}, year = {2020}, abstract = {This study presents the evaluation of a computer-based learning program for children with developmental dyscalculia and focuses on factors affecting individual responsiveness. The adaptive training program Calcularis 2.0 has been developed according to current neuro-cognitive theory of numerical cognition. It aims to automatize number representations, supports the formation and access to the mental number line and trains arithmetic operations as well as arithmetic fact knowledge in expanding number ranges. Sixty-seven children with developmental dyscalculia from second to fifth grade (mean age 8.96 years) were randomly assigned to one of two groups (Calcularis group, waiting control group). Training duration comprised a minimum of 42 training sessions {\`a} 20 min within a maximum period of 13 weeks. Compared to the waiting control group, children of the Calcularis group demonstrated a higher benefit in arithmetic operations and number line estimation. These improvements were shown to be stable after a 3-months post training interval. In addition, this study examines which predictors accounted for training improvements. Results indicate that this self-directed training was especially beneficial for children with low math anxiety scores and without an additional reading and/or spelling disorder. In conclusion, Calcularis 2.0 supports children with developmental dyscalculia to improve their arithmetical abilities and their mental number line representation. However, it is relevant to further adapt the setting to the individual circumstances.}, language = {en} } @article{MoraskePenroseWyschkonetal.2018, author = {Moraske, Svenja and Penrose, Anna and Wyschkon, Anne and Kohn, Juliane and Rauscher, Larissa and von Aster, Michael G. and Esser, G{\"u}nter}, title = {Pr{\"a}vention von Rechenst{\"o}rungen}, series = {Kindheit und Entwicklung}, volume = {27}, journal = {Kindheit und Entwicklung}, number = {1}, publisher = {Hogrefe}, address = {G{\"o}ttingen}, issn = {0942-5403}, doi = {10.1026/0942-5403/a000242}, pages = {31 -- 42}, year = {2018}, abstract = {Ziel ist die {\"U}berpr{\"u}fung der kurz- und mittelfristigen Wirksamkeit einer vorschulischen F{\"o}rderung des Mengen- und Zahlenverst{\"a}ndnisses bei Kindern mit einem Risiko f{\"u}r die Entwicklung einer Rechenst{\"o}rung. Es wurden 32 Risikokinder mit einer Kombination aus den F{\"o}rderprogrammen Mathematik im Vorschulalter und Mengen, z{\"a}hlen, Zahlen im letzten Kindergartenjahr von den Erzieherinnen trainiert und mit 38 untrainierten Risikokindern verglichen. Hinsichtlich der kurzfristigen Wirksamkeit zeigten sich positive Trainingseffekte auf die numerischen Leistungen im letzten Kindergartenjahr. Es ließen sich keine signifikanten mittelfristigen Trainingseffekte auf die Rechenleistungen im zweiten Halbjahr der 1. Klasse finden. Das eingesetzte vorschulische Pr{\"a}ventionsprogramm leistete danach einen wichtigen Beitrag zur kurzfristigen Verbesserung der mathematischen Basiskompetenzen.}, language = {de} } @article{KucianKohnHannulaSormunenetal.2012, author = {Kucian, Karin and Kohn, Juliane and Hannula-Sormunen, Minna M. and Richtmann, Verena and Grond, Ursin and K{\"a}ser, Tanja and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Kinder mit Dyskalkulie fokussieren spontan weniger auf Anzahligkeit}, year = {2012}, language = {de} } @article{KohnEsser2008, author = {Kohn, Juliane and Esser, G{\"u}nter}, title = {ADHS im Jugend- und Erwachsenenalter}, issn = {0026-9298}, doi = {10.1007/s00112-008-1731-x}, year = {2008}, language = {de} } @phdthesis{Kohn2012, author = {Kohn, Juliane}, title = {Rechenst{\"o}rungen im Kindes- und Jugendalter: psychische Auff{\"a}lligkeiten und kognitive Defizite}, address = {Potsdam}, pages = {418, 48 S.}, year = {2012}, language = {de} } @article{KaeserBascheraKohnetal.2013, author = {K{\"a}ser, Tanja and Baschera, Gian-Marco and Kohn, Juliane and Kucian, Karin and Richtmann, Verena and Grond, Ursina and Gross, Markus and von Aster, Michael G.}, title = {Design and evaluation of the computer-based training program Calcularis for enhancing numerical cognition}, series = {Frontiers in psychology}, volume = {4}, journal = {Frontiers in psychology}, number = {31}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-1078}, doi = {10.3389/fpsyg.2013.00489}, pages = {13}, year = {2013}, abstract = {This article presents the design and a first pilot evaluation of the computer-based training program Calcularis for children with developmental dyscalculia (DD) or difficulties in learning mathematics. The program has been designed according to insights on the typical and atypical development of mathematical abilities. The learning process is supported through multimodal cues, which encode different properties of numbers. To offer optimal learning conditions, a user model completes the program and allows flexible adaptation to a child's individual learning and knowledge profile. Thirty-two children with difficulties in learning mathematics completed the 6-12-weeks computer training. The children played the game for 20 min per day for 5 days a week. The training effects were evaluated using neuropsychological tests. Generally, children benefited significantly from the training regarding number representation and arithmetic operations. Furthermore, children liked to play with the program and reported that the training improved their mathematical abilities.}, language = {en} } @misc{RauscherKohnKaeseretal.2016, author = {Rauscher, Larissa and Kohn, Juliane and K{\"a}ser, Tanja and Mayer, Verena and Kucian, Karin and McCaskey, Ursina and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Evaluation of a computer-based training program for enhancing arithmetic skills and spatial number representation in primary school children}, series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {430}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-406727}, pages = {14}, year = {2016}, abstract = {Calcularis is a computer-based training program which focuses on basic numerical skills, spatial representation of numbers and arithmetic operations. The program includes a user model allowing flexible adaptation to the child's individual knowledge and learning profile. The study design to evaluate the training comprises three conditions (Calcularis group, waiting control group, spelling training group). One hundred and thirty-eight children from second to fifth grade participated in the study. Training duration comprised a minimum of 24 training sessions of 20 min within a time period of 6-8 weeks. Compared to the group without training (waiting control group) and the group with an alternative training (spelling training group), the children of the Calcularis group demonstrated a higher benefit in subtraction and number line estimation with medium to large effect sizes. Therefore, Calcularis can be used effectively to support children in arithmetic performance and spatial number representation.}, language = {en} } @article{HoeseWyschkonMoraskeetal.2016, author = {H{\"o}se, Anna and Wyschkon, Anne and Moraske, Svenja and Eggeling, Marie and Quandte, Sabine and Kohn, Juliane and Poltz, Nadine and von Aster, Michael G. and Esser, G{\"u}nter}, title = {Prevention of dyslexia short-term and intermediate effects of promoting phonological awareness and letter-sound correspondence with at-risk preschool children}, series = {Zeitschrift f{\~A}¼r Kinder- und Jugendpsychiatrie und Psychotherapie}, volume = {44}, journal = {Zeitschrift f{\~A}¼r Kinder- und Jugendpsychiatrie und Psychotherapie}, publisher = {Hogrefe}, address = {Bern}, issn = {1422-4917}, doi = {10.1024/1422-4917/a000456}, pages = {377 -- 391}, year = {2016}, abstract = {Objective: This study assesses the short-term and intermediate effects of preschool training stimulating phonological awareness and letter-sound correspondence for children at risk of developing dyslexia. Moreover, we examined whether training reduced the frequency of subsequent dyslexic problems. Method: 25 children at risk of developing dyslexia were trained with Horen, Lauschen, Lernen 1 und 2 (Kuspert \& Schneider, 2008; Plume \& Schneider, 2004) by their kindergarten teachers and were compared with 60 untrained at-risk children. Results:The training revealed a significant short-term effect: The phonological awareness of trained at-risk children increased significantly over that of untrained at-risk children. However, there were no differences in phonological awareness, spelling, and reading ability between the first-graders in the training and control group. Furthermore, reading problems were reduced in the training group. Conclusions: In the future, phonological awareness as well as additional predictors should be included when identifying children vulnerable to developing dyslexia. Moreover, in order to prevent dyslexia, additional prerequisite deficits need to be identified, alleviated, and their effects evaluated.}, language = {de} } @article{RauscherKohnKaeseretal.2016, author = {Rauscher, Larissa and Kohn, Juliane and K{\"a}ser, Tanja and Mayer, Verena and Kucian, Karin and McCaskey, Ursina and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Evaluation of a Computer-Based Training Program for Enhancing Arithmetic Skills and Spatial Number Representation in Primary School Children}, series = {Frontiers in psychology}, volume = {7}, journal = {Frontiers in psychology}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-1078}, doi = {10.3389/fpsyg.2016.00913}, pages = {14086 -- 14099}, year = {2016}, abstract = {Calcularis is a computer-based training program which focuses on basic numerical skills, spatial representation of numbers and arithmetic operations. The program includes a user model allowing flexible adaptation to the child's individual knowledge and learning profile. The study design to evaluate the training comprises three conditions (Calcularis group, waiting control group, spelling training group). One hundred and thirty-eight children from second to fifth grade participated in the study. Training duration comprised a minimum of 24 training sessions of 20 min within a time period of 6-8 weeks. Compared to the group without training (waiting control group) and the group with an alternative training (spelling training group), the children of the Calcularis group demonstrated a higher benefit in subtraction and number line estimation with medium to large effect sizes. Therefore, Calcularis can be used effectively to support children in arithmetic performance and spatial number representation.}, language = {en} } @article{GraefenKohnWyschkonetal.2015, author = {Graefen, Johanna and Kohn, Juliane and Wyschkon, Anne and Esser, G{\"u}nter}, title = {Internalizing problems in children and adolescents with math disability}, series = {Zeitschrift f{\"u}r Psychologie = Journal of psychology}, volume = {223}, journal = {Zeitschrift f{\"u}r Psychologie = Journal of psychology}, number = {2}, publisher = {Hogrefe}, address = {G{\"o}ttingen}, issn = {2190-8370}, doi = {10.1027/2151-2604/a000207}, pages = {93 -- 101}, year = {2015}, abstract = {Research has shown that learning disabilities are associated with internalizing problems in (pre) adolescents. In order to examine this relationship for math disability (MD), math achievement and internalizing problem scores were measured in a representative group of 1,436 (pre) adolescents. MD was defined by a discrepancy between math achievement and IQ. Internalizing problems were measured through a multi-informant (parents, teachers, self-report) approach. The results revealed that MD puts (pre) adolescents at a higher risk for internalizing problems. External and self-ratings differed between boys and girls, indicating that either they show distinct internalizing symptoms or they are being perceived differently by parents and teachers. Results emphasize the importance of both a multi-informant approach and the consideration of gender differences when measuring internalizing symptomatology of children with MD. For an optimal treatment of MD, depressive and anxious symptoms need to be considered.}, language = {en} } @article{KohnRauscherKucianetal.2020, author = {Kohn, Juliane and Rauscher, Larissa and Kucian, Karin and K{\"a}ser, Tanja and Wyschkon, Anne and Esser, G{\"u}nter and von Aster, Michael G.}, title = {Efficacy of a Computer-Based Learning Program in Children With Developmental Dyscalculia}, series = {Frontiers in Psychology}, volume = {11}, journal = {Frontiers in Psychology}, publisher = {Frontiers Research Foundation}, address = {Lausanne}, issn = {1664-1078}, doi = {10.3389/fpsyg.2020.01115}, pages = {14}, year = {2020}, abstract = {This study presents the evaluation of a computer-based learning program for children with developmental dyscalculia and focuses on factors affecting individual responsiveness. The adaptive training program Calcularis 2.0 has been developed according to current neuro-cognitive theory of numerical cognition. It aims to automatize number representations, supports the formation and access to the mental number line and trains arithmetic operations as well as arithmetic fact knowledge in expanding number ranges. Sixty-seven children with developmental dyscalculia from second to fifth grade (mean age 8.96 years) were randomly assigned to one of two groups (Calcularis group, waiting control group). Training duration comprised a minimum of 42 training sessions {\`a} 20 min within a maximum period of 13 weeks. Compared to the waiting control group, children of the Calcularis group demonstrated a higher benefit in arithmetic operations and number line estimation. These improvements were shown to be stable after a 3-months post training interval. In addition, this study examines which predictors accounted for training improvements. Results indicate that this self-directed training was especially beneficial for children with low math anxiety scores and without an additional reading and/or spelling disorder. In conclusion, Calcularis 2.0 supports children with developmental dyscalculia to improve their arithmetical abilities and their mental number line representation. However, it is relevant to further adapt the setting to the individual circumstances.}, language = {en} } @misc{MoraskePenroseWyschkonetal.2018, author = {Moraske, Svenja and Penrose, Anna and Wyschkon, Anne and Kohn, Juliane and Rauscher, Larissa and von Aster, Michael G. and Esser, G{\"u}nter}, title = {Pr{\"a}vention von Rechenst{\"o}rungen}, series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, number = {616}, issn = {1866-8364}, doi = {10.25932/publishup-43410}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-434101}, pages = {31 -- 42}, year = {2018}, abstract = {Ziel ist die {\"U}berpr{\"u}fung der kurz- und mittelfristigen Wirksamkeit einer vorschulischen F{\"o}rderung des Mengen- und Zahlenverst{\"a}ndnisses bei Kindern mit einem Risiko f{\"u}r die Entwicklung einer Rechenst{\"o}rung. Es wurden 32 Risikokinder mit einer Kombination aus den F{\"o}rderprogrammen Mathematik im Vorschulalter und Mengen, z{\"a}hlen, Zahlen im letzten Kindergartenjahr von den Erzieherinnen trainiert und mit 38 untrainierten Risikokindern verglichen. Hinsichtlich der kurzfristigen Wirksamkeit zeigten sich positive Trainingseffekte auf die numerischen Leistungen im letzten Kindergartenjahr. Es ließen sich keine signifikanten mittelfristigen Trainingseffekte auf die Rechenleistungen im zweiten Halbjahr der 1. Klasse finden. Das eingesetzte vorschulische Pr{\"a}ventionsprogramm leistete danach einen wichtigen Beitrag zur kurzfristigen Verbesserung der mathematischen Basiskompetenzen.}, language = {de} } @misc{PoltzQuandteKohnetal.2022, author = {Poltz, Nadine and Quandte, Sabine and Kohn, Juliane and Kucian, Karin and Wyschkon, Anne and von Aster, Michael and Esser, G{\"u}nter}, title = {Does It Count? Pre-School Children's Spontaneous Focusing on Numerosity and Their Development of Arithmetical Skills at School}, series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, journal = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1866-8364}, doi = {10.25932/publishup-56028}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-560283}, pages = {1 -- 18}, year = {2022}, abstract = {Background: Children's spontaneous focusing on numerosity (SFON) is related to numerical skills. This study aimed to examine (1) the developmental trajectory of SFON and (2) the interrelations between SFON and early numerical skills at pre-school as well as their influence on arithmetical skills at school. Method: Overall, 1868 German pre-school children were repeatedly assessed until second grade. Nonverbal intelligence, visual attention, visuospatial working memory, SFON and numerical skills were assessed at age five (M = 63 months, Time 1) and age six (M = 72 months, Time 2), and arithmetic was assessed at second grade (M = 95 months, Time 3). Results: SFON increased significantly during pre-school. Path analyses revealed interrelations between SFON and several numerical skills, except number knowledge. Magnitude estimation and basic calculation skills (Time 1 and Time 2), and to a small degree number knowledge (Time 2), contributed directly to arithmetic in second grade. The connection between SFON and arithmetic was fully mediated by magnitude estimation and calculation skills at pre-school. Conclusion: Our results indicate that SFON first and foremost influences deeper understanding of numerical concepts at pre-school and—in contrast to previous findings -affects only indirectly children's arithmetical development at school.}, language = {en} } @article{PoltzQuandteKohnetal.2022, author = {Poltz, Nadine and Quandte, Sabine and Kohn, Juliane and Kucian, Karin and Wyschkon, Anne and von Aster, Michael and Esser, G{\"u}nter}, title = {Does It Count? Pre-School Children's Spontaneous Focusing on Numerosity and Their Development of Arithmetical Skills at School}, series = {Brain Sciences}, volume = {12}, journal = {Brain Sciences}, edition = {3}, publisher = {MDPI}, address = {Basel, Schweiz}, issn = {2076-3425}, doi = {10.3390/brainsci12030313}, pages = {1 -- 18}, year = {2022}, abstract = {Background: Children's spontaneous focusing on numerosity (SFON) is related to numerical skills. This study aimed to examine (1) the developmental trajectory of SFON and (2) the interrelations between SFON and early numerical skills at pre-school as well as their influence on arithmetical skills at school. Method: Overall, 1868 German pre-school children were repeatedly assessed until second grade. Nonverbal intelligence, visual attention, visuospatial working memory, SFON and numerical skills were assessed at age five (M = 63 months, Time 1) and age six (M = 72 months, Time 2), and arithmetic was assessed at second grade (M = 95 months, Time 3). Results: SFON increased significantly during pre-school. Path analyses revealed interrelations between SFON and several numerical skills, except number knowledge. Magnitude estimation and basic calculation skills (Time 1 and Time 2), and to a small degree number knowledge (Time 2), contributed directly to arithmetic in second grade. The connection between SFON and arithmetic was fully mediated by magnitude estimation and calculation skills at pre-school. Conclusion: Our results indicate that SFON first and foremost influences deeper understanding of numerical concepts at pre-school and—in contrast to previous findings -affects only indirectly children's arithmetical development at school.}, language = {en} } @article{WyschkonKohnBallaschketal.2008, author = {Wyschkon, Anne and Kohn, Juliane and Ballaschk, Katja and Esser, G{\"u}nter}, title = {Basisdiagnostik Umschriebener Entwicklungsst{\"o}rungen im Grundschulalter (BUEGA)}, issn = {1864-6050}, year = {2008}, language = {de} } @article{WyschkonKohnBallaschketal.2009, author = {Wyschkon, Anne and Kohn, Juliane and Ballaschk, Katja and Esser, G{\"u}nter}, title = {Sind Rechenst{\"o}rungen genau so h{\"a}ufig wie Lese-Rechtschreibst{\"o}rungen?}, issn = {1422-4917}, doi = {10.1024/1422-4917.37.6.499}, year = {2009}, abstract = {Is a specific disorder of arithmetic skills as common as reading/spelling disorder?Background: Referring to the prevalence rates of learning disorders in the research literature, the numbers of mathematics disorder and reading/ spelling disorder are often reported to be identical. However, the correlation between intelligence level and reading/ spelling skills is much weaker than between intelligence and arithmetic skills. If the same definition criterion is applied to both disorders, a lower prevalence rate for mathematics disorder should be expected. Objective: Are there differences in the prevalence estimates for learning disorders depending on the definition criterion? Method: A large representative sample of German students (N = 1970) was used to review the hypothesis. Results: Depending on the definition criterion, we could show a prevalence range of mathematics disorder between 0.1\% and 8.1\% in the same sample. Using the same definition criterion for both learning disorders, there are two to three times as many students with reading/spelling disorder than those with mathematics disorder. Discussion: Whenever children with reading/spelling disorder are compared to children with mathematics disorder, the same definition criterion has to be applied.}, language = {de} }