Lateralized reaching as dynamical symmetry breaking in the bushbaby (Otolemur garnettii): preliminary evidence.

Eight bushbabies were subjected to an extensive series of hand preference trials in which they were required to reach for a raisin from a rotating platform approaching from the right- or left-hand side of their visual field. Three principal types of behavior were observed. Several individuals known to be stable in hand preference continued to show a strong preference for a single hand.

Relative efficiency of preferred and nonpreferred patterns of lateralized foraging in the gentle lemur (Hapalemur griseus).

Lateralized patterns of hand use in species-typical bamboo shoot foraging were evaluated for efficiency in five female and six male gentle lemurs (Hapalemur griseus sp.). Efficiency was defined as amount of time required to complete a foraging response sequence.

Patterns of hand and mouth lateral biases in bamboo leaf shoot feeding and simple food reaching in the gentle lemur (Hapalemur griseus).

Lateralized feeding behaviors of 7 wild-born and 6 captive-born Hapalemur griseus sp. were evaluated in two conditions, simple food reaching and species-typical bamboo foraging. Gentle lemurs were found to have the strongest lateral hand preference in simple food reaching of any prosimian species yet studied.

Laterality in quadrupedal and bipedal prosimians: Reach and whole-body turn in the mouse lemur (Microcebus murinus) and the galago (Galago moholi).

Lateral preferences in food reaching and whole-body turning were assessed in 24 prosimian primates: 16 galagos (Galago moholi) and 8 mouse lemurs (Microcebus murinus). Reach and turn preference in the galago were examined using a single testing procedure; separate procedures were used to evaluate reach and turn preferences in the mouse lemur. The motoric requirements for both species were 1) reach into a Plexiglas container with a single hand for a food item and 2) execution of a whole-body rotation about the long axis of the body.