浅谈颈椎后纵韧带骨化症的手术治疗

摘要：颈椎后纵韧带骨化（OPLL）是一种由于后纵韧带异位骨化导致脊髓和神经根受压而产生的疾病,其病因尚未明确。手术治疗是一种有效的治疗手段,但是手术时机的选择仍充满争议。手术方法根据手术入路可分为颈前路、颈后路和前后路联合入路手术。内固定及融合方式也很多,即使同样的手术入路,也有多种不同的内固定及融合方式可供选择。不同的手术方法有不同的适应证和优缺点。本文就颈椎后纵韧带骨化症的手术治疗进行综述。     

Best linear prediction of composite universe scores

The problem of predicting universe scores for samples of examinees based on their responses to samples of items is treated. A general measurement procedure is described in which multiple test forms are developed from a table of specifications and each form is administered to a different sample of examinees. The measurement model categorizes items according to the cells of such a table, and the linear function derived for minimizing error variance in prediction uses responses to these categories. In addition, some distinctions are drawn between aspects of the approach taken here and the familiar regressed score estimates.The author thanks Robert L. Brennan, Michael J. Kolen, and Richard Sawyer for helpful comments and corrections, and anonymous reviewers for suggested improvements.     

La construcción de la habilidad de “rodeo manual” en bebés en contextos interactivos con un adulto: un estudio longitudinal

Resumen

Este trabajo trata la adquisición de habilidades en el periodo sensoriomotor desde un marco teórico vigotskiano. Intentamos ver cómo la díada cuidador principal-bebé puede ser la matriz en la que también el desarrollo de las habilidades se produce; elegimos la habilidad de rodeo manual con barrera transparente (Kaye, 1977) en una situación de interacción adulto-bebé, a los 5 meses y a los 9 meses, en 15 díadas. Construimos un sistema de categorías observacional para codificar la conducta infantil y adulta, de cara a analizar: a) los avances en el periodo longitudinal estudiado; b) la microgénesis (Wertsch y Hickmann, 1987): los avances en el transcurso de toda la sesión, en cada edad estudiada; c) las intervenciones del adulto; d) la propia construcción de la habilidad de rodeo. Encontramos que el papel de adulto (cuidador principal del bebé en nuestro caso) es responsable de avances en el transcurso de la sesión, aunque con ciertas limitaciones debidas al intentar verificar esta eficacia observando una sesión de interacción y con una única tarea (en cada uno de los dos momentos evolutivos estudiados) en unas edades en las que el paisaje epigenético nos impone una mayor constricción que covaría con la menor maniobrabi- lidad de los agentes externos de cambio. Al contrastar las dos edades, el bebé de 9 meses aprovecha más la ayuda del adulto durante la fase de actuación conjunta, presenta más éxitos antes de la ayuda recibida y mayor avance en la habilidad, que a los 5 meses. Los cuidadores detectan esta mayor destreza, como muestran sus intervenciones en cada edad El concepto de “marco” es algo bastante amplio y genérico, y depende de la habilidad que se está “cociendo” en ese momento evolutivo, y de la situación propuesta; en todo caso, destacamos el papel facilitador del adulto (Lockman y McHale, 1989).     

Cues to intention: the role of movement information

Body movement provides a rich source of cues about other people’s goals and intentions. In the present research, we investigate how well people can distinguish between different social intentions on the basis of movement information. Participants observed a model reaching toward and grasping a wooden block with the intent to cooperate with a partner, compete against an opponent, or perform an individual action. In Experiment 1, a temporal occlusion procedure was used as to determine whether advance information gained during the viewing of the initial phase of an action allowed the observers to discriminate across movements performed with different intentions. In Experiment 2, we examined what kind of cues observers relied upon for the discrimination of intentions by masking selected spatial areas of the model (i.e., the arm or the face) maintaining the same temporal occlusion as for Experiment 1. Results revealed that observers could readily judge whether the object was grasped with the intent to cooperate, compete, or perform an individual action. Seeing the arm was better than seeing the face for discriminating individual movements performed at different speeds (natural-speed vs. fast-speed individual movements). By contrast, seeing the face was better than seeing the arm for discriminating social from individual movements performed at a comparable speed (cooperative vs. natural-speed individual movements, competitive vs. fast-speed individual movements). These results demonstrate that observers are attuned to advance movement information from different cues and that they can use such kind of information to anticipate the future course of an action.     

Participant Retention in the Parents Matter! Program: Strategies and Outcome

We present a discussion of the literature addressing retention of ethnic minority samples in longitudinal studies. In addition, we describe the retention procedures implemented in the Parents Matter! Program (PMP), a community-based sexual risk reduction intervention for African American families. Finally, the results of PMP's retention strategies are presented.     

Semantic and episodic predictions of memory for plans1,2,3

Abstract: This study was conducted to investigate the planning process within memory for plans. Experiment 1 examined the effect of self‐involvement on memory for a 1‐day plan, in which approximately half of the 104 undergraduate participants were instructed to assume that the plans were their own while the other half were told only to memorize them. A U‐shaped curve, indicating better recall for morning and evening plans than for afternoon ones, was observed only with the first group. Experiment 2 was designed to further clarify the planning strategies of memory for plans, in which approximately half of the 77 undergraduate participants were asked to imagine executing the plans while the other half were given a more limited strategy. U‐shaped curves were observed in both conditions, with memory performance being higher for the first group. These results are interpreted as indicating that the semantic prediction of future plans conforms to a U‐shaped curve, while the episodic prediction of future plans enhances memory performance.     

Longitudinal Intellectual Assessment of Children With HIV Infection

The objective of this paper was to describe the intellectual development of 39 children with HIV infection. The children received serial evaluations over a 10-year period. Thirty-nine children were assessed with age-appropriate intellectual measures at regular intervals as part of their treatment in the HIV Program of a children's hospital. Children showed an 24-point drop in mean Bayley Mental scores over the first 2 years of life. McCarthy scores remained in the low average range from ages 3–5 years. IQ scores were stable by age 6 in the low average range, and unchanged through age 12. Significant changes in memory, vocabulary, and performance subtests were noted. Children with HIV infection demonstrated a significant decline in mental functioning over the first 2 years of life, fell into the low average range by age 3, and remained in the low average range, with subtle changes in some areas.     

Estimating latent correlations between repeated testings

A model for longitudinal latent structure analysis is proposed. We assume that test scores for a given mental or attitudinal test are observed for the same individuals at two different points in time. The purpose of the analysis is to fit a model that combines the values of the latent variable at the two time points in a two-dimensional latent density. The correlation coefficient between the two values of the latent variable can then be estimated. The theory and methods are illustrated by a Danish dataset concerning psychic vulnerability.     

Desire for control and optimistic time predictions

Halkjelsvik, T., Rognaldsen, M. & Teigen, K. H. (2012). Desire for control and optimistic time predictions. Scandinavian Journal of Psychology 53, 499–505. Few studies have investigated individual differences in time predictions. We report two experiments that show an interaction between the personality trait Desirability of Control and reward conditions on predictions of performance time. When motivated to perform a task quickly, participants with a strong desire for control produced more optimistic predictions than those with a weaker desire for control. This effect could also be observed for a completely uncontrollable task. The results are discussed in relation to the finding that power produces more optimistic predictions, and extend this work by ruling out some previously suggested explanations.