A review, analysis, and some new data on hand-posture distributions in left-handers

The writing performance of inverted and noninverted right- and left-handers.

“…Due to the low incidence of right-handers with the inverted writing position, the addresses of these were collected for several semesters, so that a comparable number of inverted right-handers could be tested. Throughout, the inverted writing posture was denned in accordance with the criteria judged to be useful by Levy (1984): pen pointing to the bottom of the page and hand above the line of writing. Altogether, there were 19 non-inverted right-handers (6 males, 13 females), 18 inverted right-handers (13 males, 5 females), 15 inverted left-handers (5 males, 10 females) and 18 non-inverted left-handers (4 males, 14 females).…”

“…First, such a performance measure relates to the Levy and Reid (1976) model according to which hand posture is a function of cerebral organization. Several studies have claimed that inverted and non-inverted writers differ in motor performance (Gregory & Rail, 1980; Parlow, 1978; Parlow & Kinsboume, 1981; Todor, 1980), and this has been interpreted as indirect support for the model (Levy, 1982, 1984). It is appropriate to follow up this work by studying the performance of the two groups on the very task that is used to classify them: writing.…”

The writing performance of inverted and noninverted right- and left-handers.

“…Due to the low incidence of right-handers with the inverted writing position, the addresses of these were collected for several semesters, so that a comparable number of inverted right-handers could be tested. Throughout, the inverted writing posture was denned in accordance with the criteria judged to be useful by Levy (1984): pen pointing to the bottom of the page and hand above the line of writing. Altogether, there were 19 non-inverted right-handers (6 males, 13 females), 18 inverted right-handers (13 males, 5 females), 15 inverted left-handers (5 males, 10 females) and 18 non-inverted left-handers (4 males, 14 females).…”

“…First, such a performance measure relates to the Levy and Reid (1976) model according to which hand posture is a function of cerebral organization. Several studies have claimed that inverted and non-inverted writers differ in motor performance (Gregory & Rail, 1980; Parlow, 1978; Parlow & Kinsboume, 1981; Todor, 1980), and this has been interpreted as indirect support for the model (Levy, 1982, 1984). It is appropriate to follow up this work by studying the performance of the two groups on the very task that is used to classify them: writing.…”

Desempenho na escrita em destros e canhotos em relação ao sexo e à postura

“…Além de autoclassificação, cada aluno escreveu seu nome numa linha horizontal dentro de um desenho de um relógio e o experimentador avaliou a postura com base no critério adotado de Levy (1984). Se a mão fosse posicionada acima da linha de pauta e a ponta do lápis consistentemente orientada para a parte inferior do relógio (entre 4:00 a 8:00 horas), o aluno era classificado como invertido.…”

How and why do the two cerebral hemispheres interact?

“…Some left-handers write with the pen pointing above the writing line and the hand below it (normal posture [LN]), whereas others write with the opposite (inverted) posture (LI; Levy & Reid, 1976). Right-handed inverters (RIs) are rare, making up about 1% of dextrals; the rest use the normal posture (RN; Levy, 1984; Levy & Reid, 1976, 1978). Levy and Reid initially proposed that in inverters language functions are mediated ipsilateral to the writing hand, whereas in noninverters they are mediated contralateral to the writing hand.…”

The writing performance of inverted and noninverted right- and left-handers.

“…Due to the low incidence of right-handers with the inverted writing position, the addresses of these were collected for several semesters, so that a comparable number of inverted right-handers could be tested. Throughout, the inverted writing posture was denned in accordance with the criteria judged to be useful by Levy (1984): pen pointing to the bottom of the page and hand above the line of writing. Altogether, there were 19 non-inverted right-handers (6 males, 13 females), 18 inverted right-handers (13 males, 5 females), 15 inverted left-handers (5 males, 10 females) and 18 non-inverted left-handers (4 males, 14 females).…”

“…First, such a performance measure relates to the Levy and Reid (1976) model according to which hand posture is a function of cerebral organization. Several studies have claimed that inverted and non-inverted writers differ in motor performance (Gregory & Rail, 1980; Parlow, 1978; Parlow & Kinsboume, 1981; Todor, 1980), and this has been interpreted as indirect support for the model (Levy, 1982, 1984). It is appropriate to follow up this work by studying the performance of the two groups on the very task that is used to classify them: writing.…”

Desempenho na escrita em destros e canhotos em relação ao sexo e à postura

“…Além de autoclassificação, cada aluno escreveu seu nome numa linha horizontal dentro de um desenho de um relógio e o experimentador avaliou a postura com base no critério adotado de Levy (1984). Se a mão fosse posicionada acima da linha de pauta e a ponta do lápis consistentemente orientada para a parte inferior do relógio (entre 4:00 a 8:00 horas), o aluno era classificado como invertido.…”

How and why do the two cerebral hemispheres interact?

“…Some left-handers write with the pen pointing above the writing line and the hand below it (normal posture [LN]), whereas others write with the opposite (inverted) posture (LI; Levy & Reid, 1976). Right-handed inverters (RIs) are rare, making up about 1% of dextrals; the rest use the normal posture (RN; Levy, 1984; Levy & Reid, 1976, 1978). Levy and Reid initially proposed that in inverters language functions are mediated ipsilateral to the writing hand, whereas in noninverters they are mediated contralateral to the writing hand.…”

The writing performance of inverted and noninverted right- and left-handers.

“…Due to the low incidence of right-handers with the inverted writing position, the addresses of these were collected for several semesters, so that a comparable number of inverted right-handers could be tested. Throughout, the inverted writing posture was denned in accordance with the criteria judged to be useful by Levy (1984): pen pointing to the bottom of the page and hand above the line of writing. Altogether, there were 19 non-inverted right-handers (6 males, 13 females), 18 inverted right-handers (13 males, 5 females), 15 inverted left-handers (5 males, 10 females) and 18 non-inverted left-handers (4 males, 14 females).…”

“…First, such a performance measure relates to the Levy and Reid (1976) model according to which hand posture is a function of cerebral organization. Several studies have claimed that inverted and non-inverted writers differ in motor performance (Gregory & Rail, 1980; Parlow, 1978; Parlow & Kinsboume, 1981; Todor, 1980), and this has been interpreted as indirect support for the model (Levy, 1982, 1984). It is appropriate to follow up this work by studying the performance of the two groups on the very task that is used to classify them: writing.…”

Desempenho na escrita em destros e canhotos em relação ao sexo e à postura

“…Além de autoclassificação, cada aluno escreveu seu nome numa linha horizontal dentro de um desenho de um relógio e o experimentador avaliou a postura com base no critério adotado de Levy (1984). Se a mão fosse posicionada acima da linha de pauta e a ponta do lápis consistentemente orientada para a parte inferior do relógio (entre 4:00 a 8:00 horas), o aluno era classificado como invertido.…”

How and why do the two cerebral hemispheres interact?

“…Some left-handers write with the pen pointing above the writing line and the hand below it (normal posture [LN]), whereas others write with the opposite (inverted) posture (LI; Levy & Reid, 1976). Right-handed inverters (RIs) are rare, making up about 1% of dextrals; the rest use the normal posture (RN; Levy, 1984; Levy & Reid, 1976, 1978). Levy and Reid initially proposed that in inverters language functions are mediated ipsilateral to the writing hand, whereas in noninverters they are mediated contralateral to the writing hand.…”