The oculomotor system: (1) Vertical-horizontal interaction and signal recognition, (2) Time delays and power spectra

In the first section of this thesis, two-dimensional properties of the human eye movement control system were studied. The vertical - horizontal interaction was investigated by using a two-dimensional target motion consisting of a sinusoid in one of the directions vertical or horizontal, and low-pass filtered Gaussian random motion of variable bandwidth (and hence information content) in the orthogonal direction. It was found that the random motion reduced the efficiency of the sinusoidal tracking. However, the sinusoidal tracking was only slightly dependent on the bandwidth of the random motion. Thus the system should be thought of as consisting of two independent channels with a small amount of mutual cross-talk.

These target motions were then rotated to discover whether or not the system is capable of recognizing the two-component nature of the target motion. That is, the sinusoid was presented along an oblique line (neither vertical nor horizontal) with the random motion orthogonal to it. The system did not simply track the vertical and horizontal components of motion, but rotated its frame of reference so that its two tracking channels coincided with the directions of the two target motion components. This recognition occurred even when the two orthogonal motions were both random, but with different bandwidths.

In the second section, time delays, prediction and power spectra were examined. Time delays were calculated in response to various periodic signals, various bandwidths of narrow-band Gaussian random motions and sinusoids. It was demonstrated that prediction occurred only when the target motion was periodic, and only if the harmonic content was such that the signal was sufficiently narrow-band. It appears as if general periodic motions are split into predictive and non-predictive components.

For unpredictable motions, the relationship between the time delay and the average speed of the retinal image was linear. Based on this I proposed a model explaining the time delays for both random and periodic motions. My experiments did not prove that the system is sampled data, or that it is continuous. However, the model can be interpreted as representative of a sample data system whose sample interval is a function of the target motion.

It was shown that increasing the bandwidth of the low-pass filtered Gaussian random motion resulted in an increase of the eye movement bandwidth. Some properties of the eyeball-muscle dynamics and the extraocular muscle "active state tension" were derived.

Sociedade de controle e medicalização na educação: cartografando as práticas de um psicólogo nas escolas de uma cidade do interior do Rio de Janeiro

Esta dissertação baseia-se em uma pesquisa-intervenção realizada em cinco escolas de nível fundamental e infantil, e em uma escola de ensino especial/ atendimento educacional especializado (AEE) de uma cidade de pequeno porte do interior do Rio de Janeiro, na região sul do estado. O presente trabalho situa-se no contexto das discussões sobre as práticas de medicalização na escola-empresa e nas sociedades de controle, e tem como objetivo a investigação da medicalização e a judicialização como exigências que têm moldado um viés predominante médico-assistencialista ao trabalho do psicólogo, concentrando-se em atendimentos individualizados a alunos e famílias nas escolas públicas. O método adotado é o da cartografia (Deleuze & Guattari). Os conceitos de Medicalização (Conrad, Illitch, Szasz). Controle (Deleuze), e o conceito científico-ficcional de Pré-Crime (Dick) são a coluna vertebral do trabalho. A pesquisa de cunho qualitativo utiliza os referenciais teórico-práticos da análise institucional (AI) e dos estudos da filosofia de diferença, de autores como Michel Foucault, Gilles Deleuze e Félix Guatarri, assim como a contribuição valiosa de estudiosos mais contemporâneos, como Veiga-Neto, Gallo e Marcondes. Os analisadores dos relatórios pré-crime de medicalização do fracasso escolar, da (in)disciplina e da loucura através funcionam como pistas para as passagens dos diagnósticos para as práticas e modos coletivos de subjetivação, contexto mais amplo que nos conduz à visibilidade das questões do trabalho, da saúde no trabalho no magistério, e às plataformas de alianças coletivas entre técnicos(psicólogos) e não-técnicos (professores) para a construção dos processos de desmedicalização e desmedicalização na Educação.

Preliminary use of oxygen stable isotopes and the 1983 El Niño to assess the accuracy of aging black rockfish (Sebastes melanops)

Black rockfish (Sebastes melanops) range from California to Alaska and are found in both nearshore and shallow continental shelf waters (Love et al., 2002). Juveniles and subadults inhabit shallow water, moving deeper as they grow. Generally, adults are found at depths shallower than 55 meters and reportedly live up to 50 years. The species is currently managed by using information from an age-structured stock assessment model (Ralston and Dick, 2003).

Comparison of Standard Length, Fork Length, and Total Length for Measuring West Coast Marine Fishes

Measurements of adult marine fishes on the U.S. west coast are usually made using one of three methods: standard length, fork length, or total length. Each method has advantages and disadvantages. In this paper we attempt to determine whether one method is faster and/or more reliable than the other methods. We found that all three methods were comparable. There was no appreciable difference in the time it took to measure fish using the different methods. Fork length had the most reproducible results; however, it had the highest level of bias between researchers. We therefore suggest that selection of measurement type be based on what other researchers have used for the species under study. The best improvement in measurement reliability probably occurs by adequate training of personnel and not type of measurement used.

Plurimidialidade e arte

Esta dissertação tem por objetivo o estudo e a realização de procedimentos artísticos singulares que se abrem após o modernismo em diferenças flagrantes, levando a formas contemporâneas de organização do sensível em que as fronteiras entre as especificidades artísticas são cada vez mais diluídas. Conceitos como, dentre outros, o de campo expandido ou campo ampliado, de Rosalind Krauss, de arte inespecífica, de Florencia Garramuño, de intermídia, de Dick Higgins, de quase-cinema, de Hélio Oiticica, de Mistura, de Ricardo Basbaum são de grande importância para a pesquisa, constituindo-se como alvo do trabalho a ser realizado. Por serem constituídos de, ao menos, três mídias distintas (sons, palavras e imagens), que, montadas, se fundem, criando uma obra de múltiplos meios entre as mídias, os vídeos ou os arranjos audiovisuais que apresento nesta dissertação têm como característica central a plurimidialidade