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761.
The purpose of this study was to identify the relationships among sociodemographic variables, family background, religiosity, course of study, academic performance, and substance use. The sample included 799 first-year students in the age range of 16 to 49 years (M age 20.1 yr., SD = 3.2) chosen at random from the University of the North in South Africa. A Model Core Questionnaire from the WHO on Substance use was administered. Analysis indicated that women smoked tobacco or cannabis and drank less than men, while women took more stimulants and other opiate type drugs than men. Low scores on religiosity was a predictor for past-month tobacco use alcohol use, binge drinking, cannabis use, and having a drinking or drug problem now. Being a member of a Protestant denominational church or a Roman Catholic was a predictor for past-month tobacco and alcohol use. A family history of drinking or drug problems and being a social science or humanities student were predictive for a current alcohol or drug problem. Economic status, education of parents. living arrangement. and rural-urban differences were not associated with substance use. Findings have implications for prevention programmes. 相似文献
762.
Germeys F De Graef P Verfaillie K 《Journal of experimental psychology. Human perception and performance》2002,28(4):868-883
To account for location-dependent and location-independent preview benefits in transsaccadic object perception, J. M. Henderson (1994) and J. M. Henderson and M. D. Anes (1994) proposed a dual-route model in which both episodic object representations and long-term memory representations store information across a saccade. Four experiments are reported in which the dual-route model was assessed. Preview benefits for saccade target objects were found to be location independent, whereas preview benefits for flanker objects were location dependent. These results support a single-route, 2-stage model of transsaccadic object perception. First, preattentive object files are set up to parse a set of attentional and/or saccade targets from peripheral vision, causing location-dependent preview benefits. Second, 1 object is attentionally selected for further processing, activating long-term memory representations and resulting in location-independent preview benefits. 相似文献
763.
The purpose of the present study was to investigate whether there is a relationship between stuttering on stressed syllables and the duration of these syllables. Sixteen adults who stutter read a text consisting of 226 syllables. The relative stress of each syllable was rated, and syllables were categorized into long- and short-stressed syllables, unstressed syllables and intermediate syllables lying in-between. In order to isolate effects caused by within-word position from those caused by linguistic stress, syllables in initial and in subsequent positions were analyzed separately. In both word position categories stressed syllables were stuttered more often than unstressed syllables. Stuttering frequency of intermediate syllables seems to be in-between stressed and unstressed syllables, just as their stress level is rated in-between. Results regarding the duration of stressed syllables do not allow final conclusions.
Educational objectives: The reader will learn about and be able to describe (1) language factors related with stuttering events, (2) the stress effect in adults who stutter, and (3) methods to control for its confounding variables. 相似文献
764.
Wichmann FA Sharpe LT Gegenfurtner KR 《Journal of experimental psychology. Learning, memory, and cognition》2002,28(3):509-520
The authors used a recognition memory paradigm to assess the influence of color information on visual memory for images of natural scenes. Subjects performed 5%-10% better for colored than for black-and-white images independent of exposure duration. Experiment 2 indicated little influence of contrast once the images were suprathreshold, and Experiment 3 revealed that performance worsened when images were presented in color and tested in black and white, or vice versa, leading to the conclusion that the surface property color is part of the memory representation. Experiments 4 and 5 exclude the possibility that the superior recognition memory for colored images results solely from attentional factors or saliency. Finally, the recognition memory advantage disappears for falsely colored images of natural scenes: The improvement in recognition memory depends on the color congruence of presented images with learned knowledge about the color gamut found within natural scenes. The results can be accounted for within a multiple memory systems framework. 相似文献
765.
766.
767.
Subitizing and its subprocesses 总被引:2,自引:0,他引:2
When people are presented with small sets of elements such as dots they can very easily determine their number. This ability
has been called subitizing. The present paper reports results from four experiments. The discussion focuses on the question
whether one or two psychological processes have to be assumed for this task of subitizing. Taken together our results support
the two-process theories. In particular, a distinction between a process of separation and a process of enumeration is suggested.
Experiments 3 and 4 support the canonical pattern hypothesis. Canonical patterns are processed substantially faster than noncanonical
patterns. Furthermore, if a complex pattern can be broken down into small canonical patterns, then participants follow a partition
and add strategy.
Accepted: 22 December 1999 相似文献
768.
769.
Mazich Molly M. Studenka Breanna E. Newell Karl M. 《Attention, perception & psychophysics》2015,77(1):329-339
Attention, Perception, & Psychophysics - In visual-motor tracking, information about past, current, and future properties of a target path can be available but, because they are typically... 相似文献
770.
Philipp Thomas Thomas Rammsayer Karl Schweizer Stefan Troche 《Advances in cognitive psychology / University of Finance and Management in Warsaw》2015,11(1):3-13
Numerous studies reported a strong link between working memory capacity (WMC) and
fluid intelligence (Gf), although views differ in respect to
how close these two constructs are related to each other. In the present study,
we used a WMC task with five levels of task demands to assess the relationship
between WMC and Gf by means of a new methodological approach
referred to as fixed-links modeling. Fixed-links models belong to the family of
confirmatory factor analysis (CFA) and are of particular interest for
experimental, repeated-measures designs. With this technique, processes
systematically varying across task conditions can be disentangled from processes
unaffected by the experimental manipulation. Proceeding from the assumption that
experimental manipulation in a WMC task leads to increasing demands on WMC, the
processes systematically varying across task conditions can be assumed to be
WMC-specific. Processes not varying across task conditions, on the other hand,
are probably independent of WMC. Fixed-links models allow for representing these
two kinds of processes by two independent latent variables. In contrast to
traditional CFA where a common latent variable is derived from the different
task conditions, fixed-links models facilitate a more precise or purified
representation of the WMC-related processes of interest. By using fixed-links
modeling to analyze data of 200 participants, we identified a non-experimental
latent variable, representing processes that remained constant irrespective of
the WMC task conditions, and an experimental latent variable which reflected
processes that varied as a function of experimental manipulation. This latter
variable represents the increasing demands on WMC and, hence, was considered a
purified measure of WMC controlled for the constant processes. Fixed-links
modeling showed that both the purified measure of WMC (β = .48) as well as the
constant processes involved in the task (β = .45) were related to
Gf. Taken together, these two latent variables explained
the same portion of variance of Gf as a single latent variable
obtained by traditional CFA (β = .65) indicating that traditional CFA causes an
overestimation of the effective relationship between WMC and
Gf. Thus, fixed-links modeling provides a feasible method for a
more valid investigation of the functional relationship between specific
constructs. 相似文献