Crossing the midline by four to eight year old children

Bradshaw, John L.; Spataro, Jo Ann; Harris, Max; Nettleton, Norman C.; Bradshaw, Judy A.

doi:10.1016/0028-3932(88)90076-0

Cited by 51 publications

(37 citation statements)

References 25 publications

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“…In the case of R.V., then, the bias is more symmetrical and comparable with that previously shown in patients with callosal infarction in, or in a section of, anterior regions of the corpus callosum (Goldenberg, 1986;Heilman et al, 1984;Kashiwagi et al, 1990). It is also similar to the pattern observed in neurological normal young children, who also show symmetrical neglect attributable to callosal immaturity (Bradshaw et al, 1988;Dobler et al, 2001;Hausmann et al, 2003;Roeltgen & Roeltgen, 1989). In the case of L.P., the pattern is closer to that seen in normal adults.…”

Section: Discussionsupporting

confidence: 87%

Line Bisection in the Split Brain.

Hausmann¹,

Corballis²,

Farbi³

2003

Neuropsychology

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The authors examined line bisection in 4 patients with resection of the corpus callosum and in 22 control participants. The control participants showed a leftward bias, especially with the left hand, implying right-hemispheric dominance in spatial attention. Two patients with anterior callosotomy showed similar biases, suggesting that the anterior callosum plays only a small role. A patient with complete callosotomy showed a strong right bias, regardless of hand use. A patient with posterior callosotomy showed the opposite pattern: a strong left bias, regardless of hand use. These data suggest that the posterior corpus callosum normally plays a role in line bisection and that the resection of the posterior corpus callosum produces consistent bias. The direction of the bias depends on which hemisphere assumes control.

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Section: Discussionsupporting

confidence: 87%

Line Bisection in the Split Brain.

Hausmann¹,

Corballis²,

Farbi³

2003

Neuropsychology

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“…This is supported by studies showing that neurologically normal young children tend to bisect the lines to the left with the left hand and to the right with the right hand (Bradshaw, Spataro, Harris, Nettleton, & Bradsaw, 1988;Dellatolas, Coutin, & De Agostini, 1996;Dobler et al, 2001). This symmetrical neglect has been attributed to callosal immaturity (Bradshaw et al, 1988;Dobler et al, 2001;Roeltgen & Roeltgen, 1989). A similar hand effect has been reported in an adult patient with partial callosal disconnection (Heilman et al, 1984).…”

mentioning

confidence: 70%

“…Although it is assumed that the symmetrical bias just described is shown by young children up to an age of 7 or 8 years (Bradshaw et al, 1988;Dobler et al, 2001), it remains unclear precisely when the symmetrical neglect pattern changes to the adult pattern of left-sided pseudoneglect. Clarification would involve assessing and comparing linebisection performance in preadolescents to that in adolescents and adults.…”

mentioning

confidence: 99%

Developmental changes in line bisection: A result of callosal maturation?

2003

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Normal adults tend to bisect horizontal lines to the left of the objective middle, especially when using the left hand. This bias has been attributed to the dominance of the right hemisphere in spatial attention. The authors investigated the effect of hand use and line position in visual line bisection in right-handed children and adults, classified into 4 different age groups: 10-12, 13-15, 18-21, and 24-53 years (N = 98). All 4 groups showed the characteristic leftward bias when using the left hand. When using the right hand, the youngest group showed a rightward bias, whereas the other 3 groups all showed a leftward bias. This suggests a shift from contralateral to right-hemispheric control during puberty and may reflect maturation of the corpus callosum.

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“…Non-schizophrenic subjects with frank lesions of the corpus callosum exhibit a pattern of intermanual line bisection performance in which the direction of errors differs in sign when bisections are executed using the right versus the left hands Heilman et al, 1984;Wolk & Coslett, 2004). Further, callosal immaturity in young children has been suggested to explain similar dissociations of bisection error as a function of hand used to respond (Bradshaw et al, 1988;Failla et al, 2003;. The absence of a significant correlation between right and left hand bisections in our patient group strongly suggests an impairment of normal interhemispheric information transfer.…”

Section: Discussionmentioning

confidence: 99%

Hemispheric asymmetry and callosal integration of visuospatial attention in schizophrenia: A tachistoscopic line bisection study

McCourt¹,

Shpaner²,

Javitt³

et al. 2008

Schizophrenia Research

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Background-A hallmark of visuospatial neglect syndrome is that patients with lesions to right parietal cortex misbisect horizontal lines far rightward of veridical center. Neurologically normal subjects misbisect lines with a systematic leftward bias (pseudoneglect). Both phenomena, as well as neuroimaging studies, disclose a predominant right hemisphere control of spatial attention. Numerous studies of patients with schizophrenia have implicated global deficits of either right or left hemisphere function, as well as compromised integrity of the corpus callosum.Methods-To better understand the functional implications of schizophrenia we utilized a forcedchoice tachistoscopic line bisection task to probe the status of right hemisphere control of spatial attention, and compared left-versus right-hand unimanual responses to index the degree of callosal transfer of visuospatial information in both patient and control groups.Results-In contrast to the significant leftward bisection errors of control subjects, patients exhibit no significant leftward error. Whereas control subjects evince a significant correlation between leftand right-hand bisection errors, patients lack a significant intermanual correlation.Conclusions-The lack of significant leftward bisection error of patients implies a deficit of right hemisphere function. The lack of a significant correlation between left-and right-hand bisection errors in patients implies a loss of callosal integrity.

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Crossing the midline by four to eight year old children

Cited by 51 publications

References 25 publications

Line Bisection in the Split Brain.

Line Bisection in the Split Brain.

Developmental changes in line bisection: A result of callosal maturation?

Hemispheric asymmetry and callosal integration of visuospatial attention in schizophrenia: A tachistoscopic line bisection study

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