Spatial interactions between consecutive movements are often attributed to inhibition of return (IOR), a phenomenon in which responses to previously signalled locations are slower than responses to unsignalled locations. In two experiments using peripheral target signals offset by 0°, 90°, or 180°, we show that consecutive saccadic (Experiment 1) and reaching (Experiment 3) responses exhibit a monotonic pattern of reaction times consistent with the currently established spatial distribution of IOR. In contrast, in two experiments with central target signals (i.e., arrowheads pointing at target locations), we find a non-monotonic pattern of reaction times for saccades (Experiment 2) and reaching movements (Experiment 4). The difference in the patterns of results observed demonstrates different behavioral effects that depend on signal type. The pattern of results observed for central stimuli are consistent with a model in which neural adaptation is occurring within motor networks encoding movement direction in a distributed manner.
Purpose
The purpose of this paper is to explore the prevalence and patterns of substance use among Canadian social workers. With legalisation of can professional regulatory bodies are pressed to consider implications of substance use for their members.
Design/methodology/approach
An online survey collected data about demographics and substance use prevalence and patterns. Statistical analysis involved pairwise comparisons, binary logistic regression models and logistic regression models to explore correlations between substance use and demographic and work-related variables.
Findings
Among the respondents (n=489), findings indicate that past-year use of cannabis (24.1 per cent), cocaine (4.5 per cent), ecstasy (1.4 per cent), amphetamines (4.3 per cent), hallucinogens (2.4 per cent), opioid pain relievers (21.0 per cent) and alcohol (83.1 per cent) are higher than the general Canadian population. Years of work experience and working night shift were significant predictors of total number of substances used in the past year. Use of a substance by a person when they were a student was highly correlated with use when they were a professional.
Research limitations/implications
Prevalence of substance use among social workers was found to be higher than the Canadian population; potential due to the anonymous nature of data collection.
Originality/value
This study has implications for social conceptualisations of professionalism and for decisions regarding professional regulation. Previous literature about substance use by professionals has focussed predominantly on implications for increased surveillance, monitoring, and disciplinary action. We contend that since substance use among professionals tends to be concealed, there may be exacerbated social misconceptions about degree of risk and when it is appropriate to intervene.
Reaction times to targets presented in the same location as a preceding cue are greater than those to targets presented opposite the cued location. This observation can be explained as a result of inhibition at the attended location (IOR), or as facilitation at the location opposite the cue (opposite facilitation effect or OFE). Past research has demonstrated that IOR is observed reliably, whereas OFE is observed only occasionally. The present series of four experiments allows us to determine whether or not OFE can be explained by eye movements as suggested by previous authors. Participants' eye movements were monitored as they were presented with an array of four placeholders aligned with the four cardinal axes. Exogenous cues and targets were presented successively. Participants (N=37) completed either: i.) cue-manual and cue-saccade experiments, ignoring the cue and then responding with a keypress or saccade, respectively, or ii.) manual-manual and saccade-saccade experiments, responding to both the cue and the target with a keypress or saccade respectively. Results demonstrated a reliable IOR effect in each of the four experiments (reaction time greater for same versus adjacent and opposite cue-target trials). None of the four experiments demonstrated evidence of an OFE (reaction times were not significantly lower for opposite versus adjacent cue-target trials). These results are inconsistent with a momentum-based account of cue-target task performance, and furthermore suggest that the OFE cannot be attributed to occasional eye movements to the cue and/or target in previous studies.
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