即时通讯工具使用偏好及其与使用动机的关系

以大学生用户为被试,采用因素分析技术探讨了即时通讯工具(IM)使用偏好的结构,并考察了IM使用动机与使用偏好的关系.结果发现:(1)IM使用偏好主要由休闲娱乐偏好、复杂沟通偏好和基本沟通偏好三个维度构成.基于该模型形成的"IM使用偏好问卷"具有较理想的项目区分度、内部一致性信度、构想效度和区分效度.(2)一种IM使用偏好的形成受多种动机的共同驱动,但不同IM使用偏好的形成受不同使用动机模式的驱动.     

Time stamp in conditioned place avoidance can be set to different circadian phases

We have reported that the expression of conditioned place avoidance (CPA) in the golden hamster is regulated in a circadian pattern such that the preference is exhibited strongly at the circadian time of prior training but not at other circadian times [Cain, S. W., Chou, T., & Ralph, M. R. (2004a). Circadian modulation of performance on an aversion-based place learning task in hamsters. Behavioural Brain Research, 150(1–2), 201–205]. In that study, animals that were trained at a specific circadian time to discriminate between a “safe” context and one paired with foot shock, showed strong avoidance of the paired context at 24 and 48 h following the last training session, and showed no avoidance at 32 and 40 h following training. In the present study, we hypothesized that this “time stamp” effect is settable to any circadian phase. This was tested by training animals at one of two times of day (ZT13 or ZT4) and testing whether a time stamp would be observed, with avoidance occurring only when training and testing times match. Results confirmed our hypothesis, suggesting that the time stamp in the performance of learned tasks can be set to any circadian phase. Such an ability may allow animals in nature to predict the recurrence of 24 h events, regardless of the time of day the event was encountered.     

中性词和负性词的纯粹接触效应

纯粹接触效应指刺激的重复呈现能增加个体对该刺激的喜好。该研究考察中性和负性情绪的非新异刺激能否产生纯粹接触效应。首先评定挑选出本身不使人产生偏好倾向的中性和负性词对。实验一、二分别以所选中性词和负性词为材料, 每个词阈下呈现6次或1次, 后进行偏好判断和再认判断。结果发现, 对多次接触的中性词,偏好分数显著高于随机水平, 再认成绩与随机水平无显著差异; 对多次接触的负性词, 偏好分数和再认成绩均与随机水平相比无显著差异。研究表明, 在阈下呈现的条件下, 中性的非新异刺激能产生经典纯粹接触效应, 而负性非新异刺激则无此种效应。负性情绪材料纯粹接触效应的这一特异性可用加工水平模型解释。     

学习次数对记忆源检测图片偏向的影响

人们总是会根据他们对记忆工作模式的原有假设或图式来进行源检测, 这使得图片—文字源检测测验中出现图片偏向, 即人们更多倾向于将以文字方式呈现的项目错误归源于视觉图像形式呈现, 而不是将图像形式呈现的项目归于文字形式呈现。实验采用标准的源检测范式, 考察了学习次数对记忆源检测图片偏向的影响。结果发现随着学习次数的增加, 记忆源检测的图片偏向越发明显。     

Externalism and the Content of Moral Motivation

In his fetishist argument, Michael Smith raises an important question: What is the content of the motivational states that constitute moral motivation? Although the argument has been widely discussed, this question has not received the attention it deserves. In the present paper, I use Smith’s argument as a point of departure for a discussion of how advocates of externalism as regards moral judgements can account for moral motivation. More precisely, I explore various explanations of moral motivation that externalists can employ to answer the question Smith poses.     

PREFERENCE FOR A STIMULUS THAT FOLLOWS A RELATIVELY AVERSIVE EVENT: CONTRAST OR DELAY REDUCTION?

Several types of contrast effects have been identified including incentive contrast, anticipatory contrast, and behavioral contrast. Clement, Feltus, Kaiser, and Zentall (2000) proposed a type of contrast that appears to be different from these others and called it within-trial contrast. In this form of contrast the relative value of a reinforcer depends on the events that occur immediately prior to the reinforcer. Reinforcers that follow relatively aversive events are preferred over those that follow less aversive events. In many cases the delay reduction hypothesis proposed by Fantino (1969) also can account for such effects. The current experiments provide a direct test of the delay reduction and contrast hypotheses by manipulating the schedule of reinforcement while holding trial duration constant. In Experiment 1, preference for fixed-interval (FI) versus differential-reinforcement-of-other-behavior (DRO) schedules of reinforcement was assessed. Some pigeons preferred one schedule over the other while others demonstrated a position (side) preference. Thus, no systematic preference was found. In Experiment 2, a simultaneous color discrimination followed the FI or DRO schedule, and following training, preference was assessed by presenting the two positive stimuli simultaneously. Consistent with the contrast hypothesis, pigeons showed a significant preference for the positive stimulus that in training had followed their less preferred schedule.     

The effects of brief and extended stimulus availability on preference

The effects of stimulus availability on preference were evaluated using two conditions of a modified preference assessment. Different preference hierarchies were found in 15-s access conditions than in 15-min access conditions. Subsequent comparisons of a short-availability high-preference stimulus and a long-availability high-preference stimulus verified differential preferences for stimuli based on duration of availability.     

颜色选择的毕生发展特点比较研究

目的：探讨从童年至老年人们颜色选择的发展变化。方法：横断研究设计要求7～90岁被试从同形异色的蝴蝶形、上装形、正方形3种形状10种颜色卡片中选择一种最喜欢的颜色。结果：不同年龄组被试对不同图形颜色选择不同。结论：除橙色外颜色选择随增龄有变化,并受具体形状的影响。     

Ethnic differences in BMI, weight concerns, and eating behaviors: comparison of Native American, White, and Hispanic adolescents

Evidence suggests that substantial proportions of adolescents, regardless of ethnicity or gender, are engaged in excessive weight control behaviors. Crago and Shisslak (2003), however, have noted that small samples and poorly validated instruments have limited the value of previous ethnic difference studies. Using the McKnight Risk Factor Survey, we compared Native American, White, and Hispanic adolescents. Native students were divided into groups with one (NA-mixed) or two (NA) Native American biological parents. Surveys were completed by 5th through 10th grade students. BMI z-scores were significantly higher for boys and girls in the NA group, and boys in this group were significantly more engaged in weight control behaviors, including purging. A higher percentage of Native and Hispanic girls preferred a larger body size. BMI was positively correlated with weight and shape concerns and with weight control behaviors, regardless of ethnicity or gender. Overweight among Native adolescents may put them at greater risk for eating problems than their White peers.     

Urban Aboriginal‐Australian and Anglo‐Australian children: in‐group preference,self‐concept,and teachers' academic evaluations

The in‐group preference and self‐concepts of urban Aboriginal‐Australian and Anglo‐Australian children have never been compared, nor their relationships to teachers' evaluations of academic performance. In this study, 60 Aboriginal (primarily local Nyoongah) and 60 Anglo children aged 6–12 years were tested on in‐group preference; children aged 8+ were tested on self‐concept. Also, their teachers evaluated them on their general academic performance. Results indicated that Anglo children showed greater in‐group preference and scored higher on teacher evaluations than Aboriginal children, although there was no difference on self‐concept. No correlation existed between in‐group preference and self‐concept. It was concluded that the problems faced by Aboriginal children are only likely to be alleviated by a great deal of structural change. Copyright © 2000 John Wiley & Sons, Ltd.