Jennifer A. Mather

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During their 3rd week of life, 73 Octopus bimaculoides were observed to test whether discrete behaviors could be grouped reliably to reflect dimensions of temperament. Frequencies of behaviors during Week 3 were subjected to principal-components analysis (PCA), resulting in 4 components (active engagement, arousal/readiness, aggression, and(More)
1. This study begins to evaluate how octopuses navigate, and whether they can use visual landmarks. Paths ofOctopus vulgaris were observed in the field as they foraged and responded to displacements.Octopus rubescens were trained to orient to a beacon in the laboratory, and response to its displacement was monitored. 2. Octopuses foraged using chemotactile(More)
A taxonomy of the movement patterns of the 8 flexible arms of octopuses is constructed. Components consist of movements of the arm itself, the ventral suckers and their stalks, as well as the relative position of arms and the skin web between them. Within 1 arm, combinations of components result in a variety of behaviors. At the level of all arms, 1 group(More)
Oculomotor pursuit can be elicited by moving visual, tactile, proprioceptive, and occasionally auditory targets presented singly. Both the accuracy and amount of pursuit are enhanced if the position of the target is specified by cues from several sensory modalities. When the motion of the target is topologically related to movements of the subject's arm,(More)
Oculomotor tracking of one's moving hand is considerably more accurate than tracking of an external target undergoing comparable motion. To identify the factors contributing to this enhancement of tracking accuracy, the influence of visual, proprioceptive, and efferent cues on tracking performance was assessed. Related observations were made on the(More)
Manual control and tracking of 12 acute and chronic schizophrenics was tested for comparison with their performance in oculomotor tracking. Schizophrenics tended to be slower in a non-timed, non-tracking hand movement, and chronics made even slower movement when the experimental room was illuminated than when it was darkened. Chronics also had a(More)
Teenage children each having one schizophrenic parent showed deficits in oculomotor control which are also found in schizophrenic subjects compared with controls. They made significantly more saccadic eye movements interrupting smooth pursuit ocular tracking. They also made significantly more double-jump saccadic movements in a looking task. Since this(More)
Studies to evaluate the prevalence, sources, and health consequences of lead absorption were conducted among children living near a primary lead smelter. Lead levels in air, soil, and dust were highest at the smelter and decreased with distance. Ninety-nine percent of one- to nine-year-old children living within 1.6 kilometers had blood lead levels greater(More)
Laure Bonnaud bonnaud@mailhost.ccr.jussieu.fr Ruth A. Byrne a9303751@unet.univie.ac.at Ke-Yang Chang ky_chang@pchome.com.tw Jorgen Hylleberg hylleberg@biology.au.dk Jutamas Jivaluk Jutamasj@fisheries.go.th Takashi Kasugai t-kasugai@nagoyaaqua.or.jp Mary T. Lucero mary.lucero@m.cc.utah.edu Jennifer A. Mather mather@uleth.ca Volker Christian Miske(More)