Effect of Practice on True Score and Intra-Individual Variability for Reaction and Movement Times for Simple and Complex Movements

Abstract

The effect of practice on individual differences and intra-individual variability in reaction and movement times were studied for simple and complex, discrete, motor tasks. Changes with practice for intertrial correlations of adjacent trials and the effects of an increasing number of interpolated trials on intertrial correlations were also observed. For both tasks and for both reaction and movement times, the intra-individual variability decreased with practice. The true score variability for reaction time on both tasks and for movement time on the simple task shows little change with practice. On the complex task, true score variability for movement time decreases with practice. For movement time, adjacent trial correlations increase during the early practice trials then remain stable. For reaction time adjacent trial correlations increase throughout practice. Remoteness effects on intertrial correlations were found for both movement and reaction times for both tasks.     

Muscle dysmorphia, gender role stress, and sociocultural influences: an exploratory study

Our study explored the contribution of gender role stress (GRS) and sociocultural appearance demands to symptoms of muscle dysmorphia (MD) in a college sample of 219 women and 154 men. For women, five GRS subscales, sociocultural appearance demands, age, and frequency of aerobic exercise predicted MD symptoms (model R2 = .33; F(8,210) = 12.81, p < . 001); for men, only one GRS subscale, age, and sociocultural appearance demands predicted MD symptoms (model R2 = .40; F(3,150) = 9.52, p < .001). Post hoc analyses revealed that a small number of items explained a substantial portion of the variation, suggesting that MD may be more related to specific perceptions of pressure to attain an attractive body than to global gender role stress.     

"伴性遗传"的课堂教学

1 教材分析 上海科技版《生命科学》（试验本）高二第一学期[1]第1节第四部分内容是＂性别决定和伴性遗传＂,本节课＂伴性遗传＂是在学生了解性别决定的基础上展开的一节重要内容,是区别于常染色体遗传方式的另一种遗传方式.教材首先给出了伴性遗传的定义,然后指出红绿色盲是一种伴性遗传病,其致病基因为隐性基因Xb.通过图解得出红绿色盲的遗传规律,     

钱钟书致周采泉书札一通

钱钟书先生腹笥之丰，文笔之美，古今罕匹，其著述中卓荦大者已汇集成册，流布于世。三联版《钱钟书集》，皇皇巨著，凡十种十三册，嘉惠士林，泽被后学，固不待言。然“集”而未“全”，难免为人“求全责备”。如钱先生妙语隽永的书札一概未收，实在让企慕仰止的“钱迷”们感喟遗珠之憾。据说“按照原先的筹划，《钱钟书集》本拟推出书信卷。     

Huffman树在公交车调度问题中的应用

在公交车调度问题中,本文提出一种新的方法,即Huffman最优树算法,该算法在电报编码和计算机指令系统优化等许多方面被广泛应用.合理解决公交车调度问题对于增加公交车公司的利益,满足乘客乘车需要都有重要意义.     

一个实用的网上投票系统

我们为北仑区电信杯网页设计大赛设计了一个主页。该主页界面简单，主要是一些网页大赛优秀作品的链接，并具有在线投票功能，可以让网友参与评分。现已被北仑港网站（http://www.blport.net.cn）选用。本叙述其设计过程。     

中国农业经济增长的制度分析

本运用新制度经济学的分析方法，提出了中国农业经济增长的一个理论模型，指出农地制度安排是影响农业经济增长的重要因素。在此基础上，分析了家庭联产承包经营责任制对农业经济增长的重大贡献，同时指出，作为一项制度创新，实现集体经济和规模经营是中国农地产权制度改革的趋势和方向，并对中国农业经济增长具有重大意义。     

"置疑教学法"的实施探索

学则须疑，学则贵疑。培养学生的质疑精神和问题意识是培养学生创新能力的必要途径．因此置疑教学法就越来越受到关注。本文追溯中外古今教育家对置疑教学的重视，揭示现实教学中学生质疑精神的缺失，从而提出置疑教学法的有效实施策略。     

终身教育理论视野中的远程教育

远程教育为中国教育带来了改革的契机,也必将对促进高等教育大众化、普及化;健全终身教育体系;推进人的全面发展产生影响。同时,在发展远程教育中,人们不能仅仅关注采用多少先进的技术手段,更要关注新手段的采用对教育本身的影响。如:学生的自主学习系统、管理制度和管理手段、资源共享等,使中国远程教育走上可持续发展之路。     

清末台州三名彦与京师大学堂

京师大学堂的创办,开中国大学之先河,在中国近代教育史上具有划时代的意义。台州的王舟瑶、喻长霖、章(?)。三位名彦曾相继投身于京师大学堂的教育事业,他们在教学和管理上作出了应有的贡献,对京师大学堂的发展和壮大起了积极的作用。