Stimulus Velocity,Duration and Uncertainty as Determiners of Response Structure and Timing Accuracy

Abstract

The present experiments examined the effects of stimulus velocity, stimulus duration, and stimulus uncertainty on the spatial-temporal structure and timing accuracy of coincident timing responses. The results of Experiment 1 indicated that the response structure for aimed movements differed from that of ballistic movements but response accuracy was comparable for both movement conditions. However, when information concerning the stimulus velocity was provided, the responses to the faster stimuli (i.e., stimuli of shorter duration) appeared to be “speeded up” copies of those to slower stimuli and response accuracy increased as the stimulus velocity increased (i.e., stimulus duration decreased). When the stimulus velocity was not known, subjects initiated a common response for approximately 260 msec and response accuracy appeared to decrease as the stimulus velocity increased (i.e., stimulus duration decreased). Experiment 2 indicated that the stimulus duration rather than the stimulus velocity was the major determiner of both the spatial-temporal structure and timing accuracy and that a very fast and a very slow stimulus will be responded to similarly when the stimulus duration remains constant.     

Do special education teachers use IEPs to guide instruction?

Teachers in a large urban school system were surveyed with a self-administered questionnaire and a modified nominal group technique to assess their views about IEPs and identify impediments to implementing the IEPs of their students. Teachers indicated that they viewed the IEP more as a legal requirement than as an important guide for planning instruction. Frequently they were not involved in the development of their students' IEPs. The article specifies reasons given by teachers for not adhering to their students IEPs and provides recommendations for increasing teacher involvement in IEP preparation. It also presents recommendations for improving instructional conditions and practices which may facilitate IEP implementation.     

Tradition or Modernity? The Fallacy of Misplaced Concreteness Among Women Science Educators in Cameroon

Building on an earlier article in which I analyzed the views of women scientists and science educators in Cameroon, West Africa (Woodhouse & Ndongko, 1993), I reflect upon the ways in which these same science educators managed to commit the fallacy of misplaced concreteness, attributed by Alfred North Whitehead to the abstractions of 17th-century physics.On the one hand, the women in our study tried to make their science teaching as concrete as possible by introducing examples from African traditional medicine that were familiar to their students. On the other, they undermined these laudable efforts by consistently diminishing the value of traditional indigenous healing, for they regarded the abstractions of scientific methodology as real in a way that such treatments were not. I argue that this is a prime example of the fallacy.Furthermore, the only way in which these women science educators could imagine that African traditional healers would be accepted by the scientific community was to become professionals by adopting the abstract methodology of science, which falls foul of the fallacy in the first place. Only then could their various traditional treatments be assimilated to the market and developed commercially by multinational corporations. I argue that this overlooks the ways in which such corporations appropriate the cultural and intellectual property of traditional healers in Cameroon and elsewhere. Moreover, their reasoning is based once again on the fallacy of misplaced concreteness, accepting the abstractions of the market as real, while disregarding the value of indigenous knowledge itself.     

On the Reliability of Testlet-Based Tests

If a test is constructed of testlets, one must take into account the within-testlet structure in the calculation of test statistics. Failing to do so may yield serious biases in the estimation of such statistics as reliability. We demonstrate how to calculate the reliability of a testlet-based test. We show that traditional reliabilities calculated on two reading comprehension tests constructed of four testlets are substantial overestimates.     

Banners for Books: “Mighty-Hearted” Kindergartners Take Action through Arts-Based Service Learning

Teaching about the Universal Declaration of Human Rights, which was adopted by the United Nations General Assembly in 1948, is one way to support students’ learning about issues of fairness. However, learning about this document is not enough. Students need to have experiences where they explore issues of justice and equity in order to learn about respect and dignity for others. The present study explored an arts-based project in a kindergarten classroom about the Universal Declaration of Human Rights Article 26—The Right to Education. Over the course of several months, nineteen kindergarten students learned about educational inequities around the world and specifically about an under-resourced partner school in El Salvador. Children’s literature about human rights became the catalyst for critical conversations, written responses, and drawings inspiring action. Students worked to address injustice by screen printing images they drew about their beliefs regarding a child’s right to education on fabric banners to raise awareness about school inequity. These banners were then displayed in their school and in the partner school. Overall findings from students’ discussions, writing, illustrations, and interviews indicated that the kindergartners were able to recognize their own rights and educational privilege. Through the project they demonstrated active citizenship centered on care and sought further connections with children at the partner school. In using arts-based service learning, educators involved in the study discovered how art can be used as a creative process and a teaching method to support young learners raising awareness about global inequities.     

Improving the reading comprehension of children with dysphonetic and dyseidetic dyslexia using story grammar

Five 8- to 10-year-old children with dysphonetic and dyseidetic dyslexia were given instruction in reading comprehension using a story grammar strategy in which story instruction was differentially designed to match the simultaneous or sequential mental processing strengths of each dyslexia subtype. A multiple baseline, single subject experimental design and statistical analyses indicated that the experimental treatments yielded statistically and clinically significant improvements in the proportion of qualitatively important story elements recalled by the subjects, when compared to baseline traditional remedial instruction. The results suggested that students with dyslexia can increase their reading comprehension with training in metacognitive strategies. The question of whether the results were attributable to the subtype-matched methods per se or to strategy training in general, as well as a number of methodological issues, is being explored in subsequent research.     

An international comparison of community engagement in higher education

Community engagement in higher education is a shift beyond the traditional roles of instruction and research. This paper presents a transnational view of community engagement developed from two case studies of universities in the Philippines and Australia. The study, revealed variations in the way community engagement is understood and implemented by universities across different countries. These variations are related to economic, social-cultural, political and organizational factors. The role of university leadership was found to have a critical role in embedding community engagement in the organizational identity and image.     

Parent–youth discordance about youth-witnessed violence: Associations with trauma symptoms and service use in an at-risk sample

ObjectiveStudies have consistently demonstrated a lack of agreement between youth and parent reports regarding youth-witnessed violence. However, little is known about whether disagreement is associated with poorer outcomes and less utilization of mental health services. The purpose of the current study was to examine disagreement among youth and parents about youth witnessed violence, and determine whether concordance predicted trauma symptoms and recognition of need and receipt of counseling services.MethodsConcordance about youth-witnessed violence was examined in 766 dyads from the Longitudinal Studies of Child Abuse and Neglect (LONGSCAN). Youth participants self-reported trauma symptoms, caregivers indicated youth need for and receipt of services. Both youth and parents provided information about youth-witnessed violence exposure in the last year.ResultsResults showed youth and caregivers differed significantly about youth-witnessed violence. Specifically, 42% of youth reported youth-witnessed violence, compared to only 15% of parents. For those parents who reported youth-witnessed violence, only 29% reported an identified need for services and only 17% reported the youth had received any mental health services. Concordance between parent–youth dyads was associated with greater identified need for services but was not associated with the use of counseling services or trauma symptoms.ConclusionsYouth who reported witnessing violence reported more frequent trauma symptoms regardless of concordance. Parents from dyads in which both informants reported youth-witnessed violence were more likely to endorse need for, but not receipt of counseling services. Given this association between youth-witnessed violence and mental health problems, more work is needed to identify barriers to concordance as well as service utilization.