Michelle Chan

The emotional side of cognitive distraction: Implications for road safety

Driver distraction is estimated to be one of the leading causes of motor vehicle accidents. However, little is known about the role of emotional distraction on driving, despite evidence that attention is highly biased toward emotion. In the present study, we used a dual-task paradigm to examine the potential for driver distraction from emotional information presented on roadside billboards. This purpose was achieved using a driving simulator and three different types of emotional information: neutral words, negative emotional words, and positive emotional words. Participants also responded to target words while driving and completed a surprise free recall task of all the words at the end of the study. The findings suggest that driving performance is differentially affected by the valence (negative versus positive) of the emotional content. Drivers had lower mean speeds when there were emotional words compared to neutral words, and this slowing effect lasted longer when there were positive words. This may be due to distraction effects on driving behavior, which are greater for positive arousing stimuli. Moreover, when required to process non-emotional target stimuli, drivers had faster mean speeds in conditions where the targets were interspersed with emotional words compared to neutral words, and again, these effects lasted longer when there were positive words. On the other hand, negative information led to better memory recall. These unique effects may be due to separate processes in the human attention system, particularly related to arousal mechanisms and their interaction with emotion. We conclude that distraction that is emotion-based can modulate attention and decision-making abilities and have adverse impacts on driving behavior for several reasons.

Shock and awe: Distinct effects of taboo words on lexical decision and free recall:

Taboo stimuli are highly arousing, but it has been suggested that they also have inherent taboo-specific properties such as tabooness, offensiveness, or shock value. Prior studies have shown that taboo words have slower response times in lexical decision and higher recall probabilities in free recall; however, taboo words often differ from other words on more than just arousal and taboo properties. Here, we replicated both of these findings and conducted detailed item analyses to determine which word properties drive these behavioural effects. We found that lexical-decision performance was best explained by measures of lexical accessibility (e.g., word frequency) and tabooness, rather than arousal, valence, or offensiveness. However, free-recall performance was primarily driven by emotional word properties, and tabooness was the most important emotional word property for model fit. Our results suggest that the processing of taboo words is influenced by distinct sets of factors and by an intrinsic taboo-specific property.

Precise instructions determine participants’ memory search strategy in judgments of relative order in short lists

Memory often requires knowledge of the order of events. Previous findings about immediate judgments of relative order in short, subspan lists are variable regarding whether participants’ strategy is to search memory in the forward direction, starting from the first list item and progressing toward the end item, or in the backward direction, starting from the end item and progressing toward the start. We asked whether wording of the instructions influences participants’ search direction. Participants studied sequences of three to six consonants, and for an immediate, two-item probe of each list, judged which probe was presented earlier (“earlier” instruction) or later (“later” instruction) on the list. Forward and backward searches were supported for “earlier” and “later” instructions, respectively. Our findings suggest that participants have more than one effective strategy for order judgments in short lists, and that subtle instructional differences can bias memory search in either the forward or backward direction.

Midurethral Minimally Invasive Sling Procedures for Stress Urinary Incontinence

OBJECTIVE To provide an update on currently used minimally invasive surgical treatments for stress urinary incontinence in women: tension-free vaginal tape (TVT) procedure, transobturator tape (TOT) procedure, and other midurethral sling devices. OPTIONS The discussion is limited to minimally invasive surgical management of stress urinary incontinence in women. EVIDENCE A search of PubMed and Cochrane library for articles published in English before the end of February 2008 identified the most relevant literature. Recommendations were made according to the guidelines developed by the Canadian Task Force on Preventive Health Care. VALUES This update is the consensus of the Sub-Committee on Urogynaecology of the Society of Obstetricians and Gynaecologists of Canada. BENEFITS, HARMS, AND COSTS Counselling for the surgical management of urinary incontinence should consider all benefits, harms, and costs of the surgical options.

Generality of a congruity effect in judgements of relative order.

The judgement of relative order (JOR) procedure is used to investigate serial-order memory. Measuring response times, the wording of the instructions (whether the earlier or the later item was designated as the target) reversed the direction of search in subspan lists (Chan, Ross, Earle, & Caplan Psychonomic Bulletin & Review, 16(5), 945–951, 2009). If a similar congruity effect applied to above-span lists and, furthermore, with error rate as the measure, this could suggest how to model order memory across scales. Participants performed JORs on lists of nouns (Experiment 1: list lengths = 4, 6, 8, 10) or consonants (Experiment 2: list lengths = 4, 8). In addition to the usual distance, primacy, and recency effects, instructions interacted with serial position of the later probe in both experiments, not only in response time, but also in error rate, suggesting that availability, not just accessibility, is affected by instructions. The congruity effect challenges current memory models. We fitted Hacker’s (Journal of Experimental Psychology: Human Learning and Memory, 6(6), 651–675, 1980) self-terminating search model to our data and found that a switch in search direction could explain the congruity effect for short lists, but not longer lists. This suggests that JORs may need to be understood via direct-access models, adapted to produce a congruity effect, or a mix of mechanisms.

The effects of taboo-related distraction on driving performance

Driver distraction is an important risk factor in motor vehicle crashes. Roadside billboards containing negative and positive emotional content have been shown to have differential effects on driving, however, little is known about the impact of taboo information. Taboo information more reliably evokes emotional arousal than other emotional information and can lead to greater attentional capture due to its inherent ‘shock value.’ We examined the potential for driver distraction from four different types of information presented on roadside billboards: highly arousing taboo words, moderately arousing positive and negative words, and non-arousing neutral words. Results showed that taboo words were associated with better lane control and memory recall compared to the other word types. Our findings suggest that taboo words captured the most attention, but also led to a more careful driving style. One possible explanation is that drivers may be narrowing their attention to the driving task when highly aroused.