Agenesis of the Corpus Callosum 1. Neuropsychological Studies

Ferriss, Gregory S.; Dorsen, Marilyn M.

doi:10.1016/s0010-9452(75)80035-9

Cited by 51 publications

(13 citation statements)

References 39 publications

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“…From the perspective of hemispheric specialization for motoric control, reciprocal interweaving implicates the progressive ability of the dominant hemisphere to control the non-preferred as well as the preferred hand. Dominant hemisphere control of the non-preferred hand is suggested in part by cases of apraxia of the left hand following disruption of the anterior portion of the corpus callosum (Geschwind, 1975;Watson & Heilman, 1983) and by impaired bimanual coordination in individuals with callosal agenesis (Saul & Sperry, 1968;Ferriss & Dorsen, 1975;Field et al, 1978). It is tempting to link reciprocal interweaving to the maturation of the corpus callosum.…”

Section: Discussionmentioning

confidence: 99%

Infants' block banging at midline: Evidence for Gesell's principle of ‘reciprocal interweaving’ in development

Ramsay¹

1985

British J of Dev Psycho

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Infants' ability to bang two blocks together at midline was assessed at weekly intervals for the 14‐week period following the onset of duplicated syllable babbling. Block banging was first observed in some infants a few weeks after babbling onset and became frequent by 7–10 weeks after this onset. A previous study reported that the unimanual hand preference for manipulation and/or banging shown by these infants underwent two fluctuations during this period with troughs on average four and again eight weeks after babbling onset. Inspection of the data for individual infants suggested that block banging emerged or became frequent with the resolution of the first fluctuation in unimanual handedness. This relation implicates a process like Gesell's ‘reciprocal interweaving’ in the development of hemispheric specialization for motoric control—specifically, the development of the dominant hemisphere's control over the non‐preferred hand.

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Section: Discussionmentioning

confidence: 99%

Infants' block banging at midline: Evidence for Gesell's principle of ‘reciprocal interweaving’ in development

Ramsay¹

1985

British J of Dev Psycho

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“…For the 10-block version, time to solve the puzzle increased rather than decreased for the nondominant hand. Previous research has also described both moderate deficits in dominant hand TPT performance, and relatively greater deficits in the subsequent attempt with the nondominant hand (Ferriss & Dorsen, 1975;Fischer et al, 1992;Gott & Saul, 1978;Jeeves, 1979;Russell & Reitan, 1955;Sauerwein et al, 1994;Solursh et al, 1965).…”

Section: Cognitive Abilitiesmentioning

confidence: 91%

“…Deficits in acallosal patients in intermanual transfer of the spatial information of a tactile maze or formboard (the Tactual Performance Test, or TPT) have been reported (Ferriss & Dorsen, 1975;Fischer, Ryan, & Dobyns, 1992;Gott & Saul, 1978;Jeeves, 1979;Russell & Reitan, 1955;Sauerwein et al, 1994;Solursh et al, 1965). Particularly revealing regarding the importance of informational complexity in interhemispheric transfer deficits in acallosals is a series of reports of dominant versus nondominant hand performance on the TPT.…”

Section: Interhemispheric Transfer In Callosal Agenesismentioning

confidence: 99%

Cognitive and psychosocial deficits in agenesis of the corpus callosum with normal intelligence

Brown¹,

Paul²

2000

Cognitive Neuropsychiatry

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Introduction. Cognitive disabilities in agenesis of the corpus callosum (ACC) have been described in scattered reports, but few complete case descriptions are available. Consequent psychosocial disabilities in ACC have received little attention. We expected that ACC would be manifest in deficits specific to complex reasoning, concept formation, and problem solving. We also expected that these cognitive problems would be particularly evident in difficulties interpreting and understanding social situations, and in abnormal self-perception. Methods. Cognitive and psychosocial deficits were studied in two adolescents with ACC and normal IQ using a battery of cognitive and psychological tests. Results. Test results indicated poor interhemispheric integration of complex material. Performance on tests of reasoning, and concept formation were clearly below expectations based on IQ. Significantly poor performance was also found on tests of social insight, proverb interpretation, social logic, self-perception, and interpretation of ambiguous stimuli. Gross behavioural disorder or psychopathology were not found. Conclusions. ACC results in disabilities in social cognition that appear to be secondary to deficits in complex cognitive operations such as reasoning, concept formation, and problem solving. It is suggested that these cognitive deficits may be related to diminished interhemispheric transfer of complex information.

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“…The performance of adult patients with surgical commissurotomy or agenesis of the corpus callosum suggests that the integrity of callosal connections is essential for the acquisition of new bimanual motor skills (Kreuter et a/. 1972, Preilowski 1972, Ferriss and Dorsen 1975, Zaidel and Sperry 1977. Callosal pathways either may regulate the corollary motor outflow that is essential for bimanual synchronization (Preilowski 1972(Preilowski , 1975.…”

Section: Discussionmentioning

confidence: 99%

Bimanual Co‐ordination in Adolescent Boys with Reading Retardation

Klicpera

Wolff

Drake³

1981

Develop Med Child Neuro

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SUMMARY The temporal organization of unimanual and bimanual rhythmic finger‐tapping was compared between adolescent normal readers and retarded readers, as well as across subgroups of retarded readers with different psychometric intelligence profiles. Regardless of subtype, the retarded readers had substantially greater difficulty in maintaining a steady tapping rhythm than did controls, but their deficit was limited to motor tasks requiring asymmetrical timing commands to the two hands. The findings indicate that the motor deficits of retarded readers on complex skills persist into adolescence; and they suggest that one major source of difficulties in motor performance may be in rapid communication between the hemispheres. RÉSUMÉ Coordination bimanuelle des garçons présentant un retard de lecture L'organisation temporelle de la frappe rythmique de doigt en unimanuel et bimanuel a été comparée entre adolescents normaux et adolescents présentant des retards de lecture mais aussi chez des sous‐groupes de retard de lecture avec différents profils psychométriques d'intelligence. Quelque soit le sous‐groupe, les enfants retardés pour la lecture ont présenté une plus grande difficultéà maintenir un rythme de frappe régulier que les contrôles mais le déficit a été limité aux tâches motrices nécessitant une commande temporelle asymétrique des deux mains. Ces données indiquent que les déficits moteurs sur les tâches complexes en cas de retard de lecture persistent durant l'adolescence. Elles suggèrent qu'une source majeure de difficultés dans les performances motrices peut se situer dans la communication rapide entre les hémisphères. ZUSAMMENFASSUNG Bimanuelle Koordination bei heranwachsenden Jungen mit Leseschwache Bei heranwachsenden Jungen mit und ohne Leseschwäche, sowie innerhalb von Untergruppen leseschwacher Kinder mit verschiedenen psychometrischen Intelligenzprofilen wurde die temporale Steurung uni‐ und bimanueller Fingerklopfbewegungen verglichen. Unabhängig von den Untergruppen hatten die leseschwachen Kinder erheblich größere Schwierigkeiten, einen gleichbleibenden Fingerklopfrhythmus aufrechtzuerhalten als die KontroUen, jedoch war die Schwäche auf motorische Aufgaben beschränkt, die zeitlich unterschiedliche Einsätze bei beiden Händen erforderten. Die Befunde deuten darauf hin, daß die motorischen Einschränkungen leseschwacher Kinder bei komplexen Funktionen bis ins Erwachsenennalter bestehen bleiben und sie lassen vermuten, daß ein Hauptgrund für die Schwierigkeiten bei den Motorfunktionen möglicherweise in der raschen Kommunikation zwischen den Hemisphären zu suchen ist. RESUMEN Coordinación bimanual en muchachos adolescentes con retardo en la lectura La organización temporal del golpeteo rítmico digital unimanual o bimanual fué comparado entre adolescentes normales y retardados para la lectura, lo mismo que en subgrupos de retrasados en lectura con perfiles psicométricos de inteligencia diferentes. Sin atender a subtipos, los lectores retardados tenian una dificultad substancialmente mayor para mantener ...

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Agenesis of the Corpus Callosum 1. Neuropsychological Studies

Cited by 51 publications

References 39 publications

Infants' block banging at midline: Evidence for Gesell's principle of ‘reciprocal interweaving’ in development

Infants' block banging at midline: Evidence for Gesell's principle of ‘reciprocal interweaving’ in development

Cognitive and psychosocial deficits in agenesis of the corpus callosum with normal intelligence

Bimanual Co‐ordination in Adolescent Boys with Reading Retardation

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