Lucía Castellanos

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Little is known about the population characteristics of Alouatta pigra under conditions of forest fragmentation-information that is important to understanding its tolerance to habitat loss. In this work we present data on forest loss and on troop size, age, and sex composition for a population of black howler monkeys existing in the fragmented landscape(More)
A survey of the population of the black howler monkey (Alouatta pigra) present at the Mayan site of Palenque was conducted during 2000. A total of 911 man/hours, spread over 112 days were spent surveying the 600 ha area of pristine forest at the site for howler troops. We detected the presence of 136 individuals of which 131 were members of 20 troops, the(More)
Parr, L., Matheson, M., Bernstein, I. and de Waal, F. 1997. Grooming down the hierarchy: Allogrooming in captive brown capuchin monkeys, Cebus apella. Anim. Behav. 54: 361–367. Perry, S. and Rose, L. 1994. Begging and transfer of coati meat by white-faced capuchin monkeys, Cebus capucinus. Primates 35(4): 409–415. Perry, S. 1998. Male-male social(More)
This dissertation deals with the modelling of biological processes using Stochastic Petri Nets (SPNs). Petri Nets are a formalism that comes from Computer Science (Petri 1962) and has been used since many years to model systems such as computer networks. Recently, they have also been applied to model biological processes such as genetic networks (Goss &(More)
We propose a Multivariate Gaussian Process Factor Model to estimate low dimensional spatio-temporal patterns of finger motion in repeated reach-to-grasp movements. Our model decomposes and reduces the dimensionality of variation of the multivariate functional data. We first account for time variability through multivariate functional registration, then(More)
We investigate the encoding of grasping kinematics in the primary motor cortex of rhesus monkeys (Macaca mulatta). Previous work in the Schwartz lab has demonstrated cortical control of an anthropomorphic arm and a simple gripper. We aim to replace the gripper with a ‘primate-like hand’ — this work is a study towards that goal. In our experiment two rhesus(More)
The primate hand, a biomechanical structure with over twenty kinematic degrees of freedom, has an elaborate anatomical architecture. Although the hand requires complex, coordinated neural control, it endows its owner with an astonishing range of dexterous finger movements. Despite a century of research, however, the neural mechanisms that enable finger and(More)
We propose a Multivariate Gaussian Process Factor Model to estimate low dimensional spatio-temporal patterns of finger motion in repeated reach-tograsp movements. Our model decomposes and reduces the dimensionality of variation of the multivariate functional data. We first account for time variability through multivariate functional registration, and then(More)
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