Black lemur (Lemur macaco) hand preference in food reaching

Forsythe, Chris; Ward, Jeannette P.

doi:10.1007/bf02380960

Cited by 67 publications

(46 citation statements)

References 11 publications

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“…laterality within a subject and within a task) or task specialization (i.e. laterality of function across subjects but within a task) (FoRSYTHE & WARD, 1988;MASATAKA, 1990). Manual specialization (i.e.…”

Section: Discussionmentioning

confidence: 99%

True handedness in the cotton-top tamarin (Saguinus oedipus)?

Diamond

McGrew

1994

Primates

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ABSTRACT. Hand use for 8 activities was studied in 20 captive cotton-top tamarins (Saguinus oedipus). The purpose of the study was to discover if hand preferences existed across tasks and across subjects, and, if so, whether these followed the patterns of preference in MACNEILAGE et al.'s (1987) "postural origins" theory of the evolution of hand preference and hemispheric specialization in primates. This theory suggests that, for haplorines, the right hand is used preferentially for manipulative acts while the left hand is used preferentially for visually guided acts. The study showed statistically significant right hand preferences for six of the seven actions which produced sufficient data to be tested. The strength and consistency of this preference makes this study the first to suggest true handedness in a non-human primate species. Deviations from the pattern were seen in scratching and other actions when performed in a vertical posture, but these deviations took the form of a weakening of the right hand preference rather than a reversal. The findings of the study may be seen as supporting MACNEILAGE et al. 's (1987) theory only if the actions studied are all considered to be manipulative, which can be argued to be the case, though some of the actions were also visually guided.

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Section: Discussionmentioning

confidence: 99%

True handedness in the cotton-top tamarin (Saguinus oedipus)?

Diamond

McGrew

1994

Primates

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“…This might well explain the species-typical left-hand preferences displayed by primates that feed on insects using snatch and grab (i.e. ballistic) tactics, as in the case of prosimians (Forsythe & Ward 1988;Ward et al 1990), as well as the superior ability of the left hand for ballistic aimed movement in humans (Guiard et al 1983). The latter is also in keeping with the superior ability of the human right hemisphere for trajectory perception (Boulinguez et al 2003).…”

Section: Introductionmentioning

confidence: 97%

Hand and paw preferences in relation to the lateralized brain

Rogers

2008

Phil. Trans. R. Soc. B

192

162

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Hand preferences of primates are discussed as part of the broad perspective of brain lateralization in animals, and compared with paw preferences in non-primates. Previously, it has been suggested that primates are more likely to express a species-typical hand preference on complex tasks, especially in the case of coordinated hand use in using tools. I suggest that population-level hand preferences are manifested when the task demands the obligate use of the processing specialization of one hemisphere, and that this depends on the nature of the task rather than its complexity per se. Depending on the species, simple reaching tasks may not demand the obligate use of a specialized hemisphere and so do not constrain limb/hand use. In such cases, individuals may show hand preferences that are associated with consistent differences in behaviour. The individual's hand preference is associated with the expression of behaviour controlled by the hemisphere contralateral to the preferred hand (fear and reactivity in left-handed individuals versus proactivity in right-handed individuals). Recent findings of differences in brain structure between left-and right-handed primates (e.g. somatosensory cortex in marmosets) have been discussed and related to potential evolutionary advances.

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“…In the latter study the subjects were tested for hand preference in food reaching from both bipedal and quadrupedal pos tures with the result that the manifestation of hand preference was linked to bipedal posture. Additional work by Ward's research group revealed evidence of reliable hand use preference for individuals of three additional prosimian species, Lemur catta, Lemur macaco and Varecia variegata variegata [9,19,28]. The majority of lemurs observed were determined to be left-hand-preferent in food reaching.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, three types of environmental constraints are covaried systemati cally across 8 tasks. Elevation of the target was se lected because of the effect of this variable on posture and the manifestation of prosimian hand preference in previous research [9,23].…”

Section: Introductionmentioning

confidence: 99%

Hand Preferences and Whole <i>(Galago senegalensis)</i>

1989

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The hand preferences in prey capture and whole-body turning biases after prey capture were assessed in 10 lesser bushbabies (Galago senegalensis) in 8 conditions designed to manipulate posture, visibility of prey and angle of reaching. Each subject received 60 trials in each test condition for a total of 480 trials. Seven subjects had a left-hand preference in food reaching, three right and none were ambipreferent. Eight subjects had a left whole-body turning bias, one right and one had no bias. No correlation was found between reach preference and turning bias. Bipedal posture facilitated the use of the dominant hand, whereas other manipulated conditions did not have a significant effect on hand use. A neuraxial arousal system is postulated as mediator of the bipedal effect on hand use.

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Black lemur (Lemur macaco) hand preference in food reaching

Cited by 67 publications

References 11 publications

True handedness in the cotton-top tamarin (Saguinus oedipus)?

True handedness in the cotton-top tamarin (Saguinus oedipus)?

Hand and paw preferences in relation to the lateralized brain

Hand Preferences and Whole <i>(Galago senegalensis)</i>

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