Ulysses Okada de Araújo

Number of options in a movement sequence affects learners' behavior in a self-controlled practice condition.

Self-controlling practice implies a process of decision making, which suggests that the options in a self-controlled practice condition could affect learners. The number of task components with no fixed position in a movement sequence may affect the way learners self-control their practice. A 200-cm coincident timing track with 90 light-emitting diodes (LEDs) — the first and the last LEDs being the warning and the target lights, respectively — was set so that the apparent speed of the light along the track was 1.33 m/sec. Participants were required to touch six sensors sequentially, the last one coincidently with the lighting of the target light (timing task). Group 1 (n = 55) had only one constraint, and were instructed to touch the sensors in any order, except for the last sensor which had to be the one positioned close to the target light. Group 2 (n = 53) had three constraints: the first two and the last sensor to be touched. Both groups practiced the task until timing error was less than 30 msec. on three consecutive trials. There were no statistically significant differences between groups in the number of trials needed to reach the performance criterion, but (a) participants in Group 2 created fewer sequences compared to Group 1, and (b) were more likely to use the same sequence throughout the learning process. The number of options for a movement sequence affected the way learners self-controlled their practice, but had no effect on the amount of practice to reach criterion performance.

Efeitos do autocontrole da sequência de movimentos na aprendizagem de uma tarefa de “timing” coincidente

The purpose of this study was to investigate the effects of self-controlling a movement sequence on learning a coincident timing task. Thirty young adults (age = 23± 5.5 years) with no previous experience with the task were randomly assigned into two groups with different movement sequence conditions, self-controlled (FREE) and externally controlled (DET). Participants were required to tap six sensors sequentially, the last one coinciding with the arrival of a visual stimulus (timing task). On acquisition, participants in the DET group had to tap the sensors in a determined sequence, while those in the FREE group were allowed to tap the sensors in any order (except for the last one, which was the same for both groups). While no difference was found regarding the number of trials needed to reach the performance criterion in acquisition, the group FREE showed higher timing errors in transfer compared to the group DET, indicating that self-controlling the movement sequence that precedes the coincidence impairs the learning of the motor skill.

Olhares distintos sobre a noção de estabilidade e mudança no desempenho da coordenação motora grossa

Studies about gross motor coordination in children (GMC) focus on the description of normative values derived from age and sex, and few analyzed the dynamics of change of each child within its group. The goal of the present study is estimate the stability of intra-individual change over inter-individual differences over eighteen months. One hundred and twenty students with seven years old in the city of Muzambinho - MG participated in the study. Data was collected four times, with a six-month interval between each assessment. GMC was evaluated through KTK test battery. Mean values for all tests increased over time, with differences between sex for equilibrium test. The correlation values between initial performance and improvements over eighteen months indicated high heterogeneity. Results of stability estimates were weak for tests. These results were discussed about different trajectories in the development of motor coordination.

Distinct views on the notion of stability and change in the performance of gross motor coordination

Studies about gross motor coordination in children (GMC) focus on the description of normative values derived from age and sex, and few analyzed the dynamics of change of each child within its group. The goal of the present study is estimate the stability of intra-individual change over inter-individual differences over eighteen months. One hundred and twenty students with seven years old in the city of Muzambinho - MG participated in the study. Data was collected four times, with a six-month interval between each assessment. GMC was evaluated through KTK test battery. Mean values for all tests increased over time, with differences between sex for equilibrium test. The correlation values between initial performance and improvements over eighteen months indicated high heterogeneity. Results of stability estimates were weak for tests. These results were discussed about different trajectories in the development of motor coordination.

Ángulos diferentes sobre el concepto de estabilidad y cambio en el rendimiento de la coordinación motora gruesa

Studies about gross motor coordination in children (GMC) focus on the description of normative values derived from age and sex, and few analyzed the dynamics of change of each child within its group. The goal of the present study is estimate the stability of intra-individual change over inter-individual differences over eighteen months. One hundred and twenty students with seven years old in the city of Muzambinho - MG participated in the study. Data was collected four times, with a six-month interval between each assessment. GMC was evaluated through KTK test battery. Mean values for all tests increased over time, with differences between sex for equilibrium test. The correlation values between initial performance and improvements over eighteen months indicated high heterogeneity. Results of stability estimates were weak for tests. These results were discussed about different trajectories in the development of motor coordination.