Testing whether gaze cues and arrow cues produce reflexive or volitional shifts of attention

It has been suggested that two types of uninformative central cues produce reflexive orienting: gaze and arrow cues. Using the criterion that voluntary shifts of attention facilitate both response speed and perceptual accuracy, whereas reflexive shifts of attention facilitate only response speed (Prinzmetal, McCool, & Park, 2005), we tested whether these cues produce reflexive or volitional shifts of attention. A cued letter discrimination task was used with both gaze (Experiments 1A and 1B) and arrow (Experiments 2A and 2B) cues, in which participants responded to the identity of the target letter. In the response time (respond speed) tasks, participants were asked to respond as quickly as possible to the target; in the accuracy (perceptual quality) tasks, participants were asked to respond as accurately as possible. For both cue types, compatible cues were found to facilitate response speed but not perceptual accuracy, indicating that both gaze and arrow cues generate reflexive shifts in attention.     

Training parents to help their children read: A randomized control trial

Background . Low levels of literacy and high levels of behaviour problems in middle childhood often co‐occur. These persistent difficulties pose a risk to academic and social development, leading to social exclusion in adulthood. Although parent‐training programmes have been shown to be effective in enabling parents to support their children's development, very few parent interventions offer a combination of behavioural and literacy training. Aims . This paper (1) reports on a prevention programme which aimed to tackle behaviour and literacy problems in children at the beginning of school, and (2) presents the effects of the intervention on children's literacy. Sample . One hundred and four 5‐ and 6‐year‐old children selected from eight schools in an inner city disadvantaged community in London participated in the intervention. Methods . This is a randomized control trial with pre‐ and post‐measurements designed to evaluate the effectiveness of an intervention. The behavioural intervention consisted of the ‘Incredible Years’ group parenting programme combined with a new programme designed to train parents to support their children's reading at home. Results . Analyses demonstrated a significant effect of the intervention on children's word reading and writing skills, as well as parents' use of reading strategies with their children. Conclusion . A structured multicomponent preventive package delivered with attention to fidelity can enable parents to support their children's reading at home and increase their literacy skills. Together with the improvement in child behaviour, these changes could improve the life chances of children in disadvantaged communities.     

Windows executable software for the progressive demasking task

The progressive demasking (PDM) task is a perceptual identification task using degraded stimulus presentation procedures, but with the advantage of providing response time (RT) measures on each trial. Participants simply press a response button whenever they recognize a word. In this article, we present newly developed, easy-to-use freeware for PDM. Considering the difficulty of programming such a paradigm with standard experimental software, we developed a program based on high-level C libraries to be executed on Windows XP computers. The program execution is millisecond accurate forRT measurements and generates the fewest possible display duration errors.     

Using mediational models to explore the nature of tobacco motivation and tobacco treatment effects

Various theories have proposed mechanisms for drug motivation and relapse. For instance, negative reinforcement theories focus on the alleviation of withdrawal. However, other theories and some data cast doubt on the importance of withdrawal as a motivator of addictive drug use. Using data from a randomized double-blind placebo-controlled smoking cessation treatment study (N=608), this research examined the impact of withdrawal on drug motivation and the ability to maintain abstinence. Withdrawal was experimentally manipulated by randomly assigning participants to receive active bupropion versus placebo. Mediation analyses revealed that active bupropion reduced the amount of withdrawal and craving that individuals reported in the 1st week post quit; modest support was also found for smaller declines in positive affect. These effects, in turn, were all positively associated with posttreatment abstinence. These results implicate withdrawal as an important factor in motivating persistent tobacco use.     

Evidence that rats discriminate between familiar and unfamiliar putative urinary odorants of adult male conspecifics

Adam [1976; Lehman and Adams, 1977] suggested that a resident rat makes an olfactory comparison of cage odor and other rat odor prior to attacking an unfamiliar conspecific intruder. The findings of the present study are consistent with the notion that rats discriminate between familiar and unfamiliar putative urinary odorants Adult male albino rats were tested for preferences between areas treated with familiar urine (11 hours pretest exposure), unfamiliar urine (no pretest exposure), and untreated areas. Subjects (N = 12) preferred areas treated with familiar urine over ones treated with unfamiliar urine (p < 0.05). Also, they (N = 12 per preference-test group) preferred areas treated with either urine over untreated ones (familiar versus clean, p < 0.01; unfamiliar versus clean, p < 0.05).     

PI and RI in serial learning as a function of environmental context

The influence of the environmental context upon serial learning was investigated in a PI design in Experiment 1 and an RI design in Experiment 2. Either one or four lists learned either before or after the critical list were used to manipulate PI or RI, respectively. Learning the critical list in the same room as the interference-inducing lists or in a different room provided the first context manipulation. The second context factor involved relearning the critical list in the same room as it was learned 24 hours earlier, or in a different one. In the PI study the early and middle thirds of the list were affected by context in original learning. In relearning, correct responses over the first two trials differed both as a function of number of prior lists learned and of original learning context. With RI, fewer trials to relearn were required by a condition involving facilitating context manipulations, relative to a neutral context, and a competing context condition was inferior. The results are largely consistent with predictions derived from the interference theory of forgetting and traditional associative learning theory.     

How skin and object temperature influence touch sensation

Twenty subjects made magnitude estimations of the apparent heaviness of metallic stimulators of various masses and temperatures (cold, neutral, and warm). The stimulators were placed on the forearm at normal skin temperature (about 33°C), at elevated skin temperature (38°C), and at lowered skin temperature (25°C). Under neutral conditions, we replicated earlier studies: cold objects felt considerably heavier than neutral ones, warm objects somewhat heavier than neutral objects. Warming the skin essentially obliterated the intensifying effect of the warm objects but left unaltered the intensifying effect of the cold objects. Cooling the aim also essentially obliterated the intensifying effect of warm objects. It also diminished, but far from eliminated, the intensifying effect of cold objects. Cold intensification of touch sensation is a large and robust phenomenon and, unlike warm intensification, appears to characterize all body regions.     

An overview of STEAMER: An advanced computer-assisted instruction system for propulsion engineering

We are building a computer-based instructional system for teaching the operation of complex physical mechanisms. The system is based intimately on the use of simulation. Our goal in this paper is to describe the system we are attempting to construct, discuss its origins, and identify what we perceive to be its implications for psychological research into instruction.     

Visual discrimination learning and transfer in rats with hippocampal lesions

Two experiments were performed on rats with hippocampal brain damage and on a control group with neocortical lesions. In the first experiment the hippocampal group learned a difficult visual discrimination as promptly as the controls, and neither group was subsequently impaired by adding relevant or irrelevant background cues to the original stimuli. In the second experiment the animals learned a simultaneous visual discrimination in which the stimuli differed in both brightness and orientation. The hippocampal group was impaired relative to the controls on acquisition, and showed poorer transfer to stimuli differing only in brightness or orientation. The results are incompatible with the hypothesis which attempts to explain the effects of hippocampal damage by a widespread reduction in sensory gating, but they are consistent with a more restricted version of the same hypothesis.     

Job-seeking behavior: A segment of vocational development

This paper reports two companion studies which establish that there is a significant relationship between an individual's personality characteristics and his pattern of job-seeking behavior. Individuals who are tough-minded, independent and nonneurotic had specified job goals and self-actualized behavior. They were highly successful in obtaining jobs. Individuals who were sensitive, dependent and neurotic had vague goals and passive behavior. They failed to get jobs. Individuals who exhibited a mixture of the cited characteristics and behavior were also exploring career options. They had a modicum of success in obtaining jobs. Job-seeking behavior as a process of vocational development is discussed.