Perceptual behavior: recurrence analysis of a haptic exploratory procedure

Various object properties are perceptible by wielding. We asked whether the dynamics of wielding differed as a function of the to-be-perceived property. Wielding motions were analyzed to determine if they differed under the intention to perceive or not perceive rod length (experiment 1), to perceive object height versus object width (experiment 2), and to perceive the length forward of where the rod was grasped versus the position of the grasp (experiment 3). Perceiving these different properties is known to depend on different components of the object's inertia tensor. Analyses of the subtle recurrent patterns in the phase space of the hand motions revealed differences in wielding across the different perceptual intentions. Haptic exploratory procedures may exhibit distinct exploratory dynamics.     

Deterministic variability and stability in detuned bimanual rhythmic coordination

We examined the effects of crossing different degrees of cooperation and competition on inphase and antiphase 1:1 frequency locked coordination of left- and right-hand-oscillated pendulums. Degree of cooperation was manipulated through the joint frequency of oscillation specified by a metronome (the higher the frequency, the weaker the cooperation), and degree of competition by length (and, therefore, preferred frequency) differences between the two pendulums (the greater the difference, the stronger the competition). Increasing competition was accompanied by either decreasing cooperation (for six participants) or increasing cooperation (for six different participants). On each trial, a participant attempted to produce a steady-state phase relation phi for a given combination of competition and cooperation. Numerical simulations of the extended Haken-Kelso-Bunz (HKB) equation were used to predict (a) the patterns of shift in phi from either 0 or pi radians due to the different competition-cooperation relations and (b) the patterns of variability in phi. It was expected that the HKB equation would be successful in respect to (a), which it was, but not in respect to (b). The observed failure to confirm (b) was expected from the variability due to the different nonharmonic dynamics of the component oscillators, a source of variability not included in the HKB equation. The experimental results together with simulations and analyses of the phase-plane trajectories of the component oscillators suggest the operation of deterministic in addition to stochastic variability in the phase relation of contralateral limbs.     

La evaluación de la escritura

Resumen

En este estudio se realiza una revisión de los sistemas de evaluación de la escritura y de estudios relacionados. Se comienza con una visión de conjunto de las dificultades principales en el estudio de la evaluación de la escritura, y de la importancia y utilidad que tiene un sistema de evaluación de la escritura en distintas áreas de conocimiento. Posteriormente se analiza cuál es el objeto de evaluación de los diferentes sistemas y qué medidas se utilizan en las investigaciones acerca de la escritura. A este respecto se expone un modelo del producto de la escritura que permite organizar, de modo prácticamente exhaustivo, las medidas del producto escrito. Tras resumir los requisitos, que según distintos autores debería cumplir cualquier sistema de evaluación de la escritura, se clasifican los sistemas de evaluación en base a si el objeto de análisis es el proceso o el producto de la escritura, definiendo sus características generales. A su vez, se exponen diferentes clasificaciones de los sistemas de evaluación del producto escrito, realizadas principalmente en función de la estrategia de evaluación. Esta revisión muestra la falta de acuerdo existente entre los diferentes autores respecto al objeto y el modo de evalución, así como a la terminología utilizada.     

The free and cued selective reminding test: Validation for mild cognitive impairment and Alzheimer's disease

The International Working Group on Alzheimer's disease (AD) suggested the free and cued selective reminding test (FCSRT) to assess memory, as it showed high sensitivity and specificity in the differentiation of AD from healthy controls and other dementias. The FCSRT involves the use of selective reminding with semantic cueing in memory assessment. This study aims to validate the FCSRT for mild cognitive impairment (MCI) and AD through the analysis of the diagnostic accuracy and the suggestion of cut‐off scores. Patients were classified into two groups according to standard criteria: MCI (n = 100) and AD (n = 70). A matched control group (n = 101) of cognitively healthy subjects was included. The reliability and the validity of the FCSRT were analysed on the immediate (IR) and delayed (DR) recalls. The Cronbach's alpha was 0.915 for the IR and 0.879 for the DR. The total recall measures revealed good areas under the curve for MCI (IR: .818; DR: .828) and excellent for AD (IR: .987; DR: .991). Furthermore, the MCI group was subdivided with respect to a non‐similar/similar AD pattern of impairment, with almost half of the subjects showing an AD‐like decline. This analysis represents a novel contribution regarding the properties of the FCSRT in illustrating the heterogeneity of MCI at baseline. The FCSRT has proved to be a very useful tool in the characterization of the memory impairment of the AD spectrum.     

Pilot Implementation of School-Based Behavioral Parent Training: Outcomes and Acceptability

Journal of Child and Family Studies - Many children demonstrate challenging behaviors, which can pose a risk for future behavior problems and negatively impact caregivers and teachers. Behavioral...