Juan Carlos Gómez

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Behavioural, neuroimaging and neurophysiological approaches emphasise the active and constructive nature of visual perception, determined not solely by the environmental input, but modulated top-down by prior knowledge. For example, degraded images, which at first appear as meaningless 'blobs', can easily be recognized as, say, a face, after having seen the(More)
This article explores the possible cognitive function associated with pointing gestures from a Vygotskian perspective. In Study 1, 39 children who were 2-4years of age were observed in a solitary condition while solving a mnemonic task with or without an explicit memory demand. A discriminant analysis showed that children used noncommunicative pointing(More)
Although primates have often been found to co-orient visually with other individuals, members of these same species have usually failed to use co-orientation to find hidden food in object-choice experiments. This presents an evolutionary puzzle: what is the function of co-orientation if it is not used for a function as basic as locating resources?(More)
This study used a novel rating task to investigate whether high-functioning individuals with autism spectrum disorder (ASD) have difficulties distinguishing essential from variable aspects of familiar events. Participants read stories about everyday events and judged how often central, variable, and inappropriate event-components normally occur in this type(More)
OBJECTIVE This study evaluated the effectiveness, safety, and quality of life (Qol) offered by olanzapine in first-episode schizophrenia. METHOD One hundred and eighty-two patients with first-episode schizophrenia (ICD-10) drawn from a larger, naturalistic, study were evaluated after 6 months of treatment with olanzapine, risperidone, or conventional(More)
A procedure previously used to investigate imperative communication in non-human primates was applied to young children, some of whom had autism. The goal was to examine closely how requests are made in a problem-solving situation. Each child's spontaneous strategies to obtain an out-of-reach object were analyzed in terms of the ways in which he or she used(More)
Formal language theory has been extended to two-dimensional patterns, but little is known about two-dimensional pattern perception. We first examined spontaneous two-dimensional visual pattern production by humans, gathered using a novel touch screen approach. Both spontaneous creative production and subsequent aesthetic ratings show that humans prefer(More)
Individuals with autism spectrum disorders (ASD) are often reported to be good at detecting minute changes in the environment. This study tested two factors in this phenomenon; detail-focus and reduced top-down influence of scene-schema expectations on spontaneous attention to visual scene elements. Using a change blindness paradigm, adults with ASD and(More)
A comprehensive system for facial animation of generic 3D head models driven by speech is presented in this article. In the training stage, audiovisual information is extracted from audiovisual training data, and then used to compute the parameters of a single joint audiovisual hidden Markov model (AV-HMM). In contrast to most of the methods in the(More)
In this article we build multi-objective hyper-heuristics (MOHHs) using the multi-objective evolutionary algorithm NSGA-II for solving irregular 2D cutting stock problems under a bi-objective minimization schema, having a trade-off between the number of sheets used to fit a finite number of pieces and the time required to perform the placement of these(More)