The mediational role of distracting stimuli in emotional word recognition
© The Author(s) 2018
Received: 11 August 2017
Accepted: 18 December 2017
Published: 25 January 2018
Emotions are considered distractions that often prompt subsequent actions. In this way, the aim of this work was to examine the role of distracting stimuli on the relationship of RT and accuracy. In order to do that, a word recognition task was carried out in which emotional valence was manipulated. More precisely, a mediational model, testing how changes in distracting stimuli mediate RT predicting accuracy across emotional conditions, was carried out. The results suggest that changes in task demands should distract from the secondary task to the extent that these task demands implicate and affect accuracy. Moreover, the distracting task seems to mediate between accuracy and the target task under emotional stimuli, showing the negative distracting condition to be the most remarkable effect. Furthermore, neutral distracting latencies did not affect accuracy. Understanding the mechanisms by which emotion impairs cognitive functions has important implications in several fields, such as affective disorders. However, the effects of emotion on goal-directed cognitive processing remain unclear.
How emotion affects memory is a subject of interest for several areas such as clinical or even the forensic fields. In this way, the effect of emotional valence on word recognition has been described in both theoretical and empirical research. This is an effect that has been reported as a robust one on several aspects of cognition, as well as on behavior (Van Tol, Demenescu, Van der Wee, Kortekaas, Marjan, et al. 2012). Several studies claimed that emotional words might capture more attention than neutral ones (Bowen, Kark, & Kensinger 2017; Sereno, Scott, Yao, Thaden, & O’Donnell 2015). More precisely, and focusing on the particular effect of negative emotional content on word recognition, it has been suggested that negative stimuli elicit slower latencies under this condition. According to Moret-Tatay, Moreno-Cid, Argimon, Quarti Irigaray, Szczerbinski, et al. (2014), this is a plausible result suggesting that an automatic vigilance process might operate to engage attention longer. In particular, the literature (León Gordillo, Martínez, Hernández, Cruz, Meilán, et al. 2010; Meng, Zhang, Liu, Ding, Li, et al. 2017) has suggested that the “normal population” might be predisposed to direct their attention to negative stimuli, supporting the idea that the negative emotional charge could have an essential role in our evolution.
Another remarkable issue regarding this topic is that emotional words seem to be remembered better than neutral ones (Ferré, García, Fraga, Sánchez-Casas, & Molero 2010; Herbert & Kissler, 2010). Not surprisingly, it has been hypothesized that this rise of arousal might not only have an effect on response time (RT), slowing it down, but also in improving encoding (Ferré, Fraga, Comesaña, & Sánchez-Casas 2015). In other words, to deal with emotional valence could be also considered a cognitive cost. Other authors have stipulated that accuracy and speed processing might be accommodated through several parameters such as decision components and variability (Mueller & Kuchinke 2016; Ratcliff, Smith, Brown, & McKoon 2016). In terms of memory processing, recognition might include some retrieval-based processing (Racsmány, Szőllősi, & Bencze 2017). Specifically, RT has been negatively associated with accuracy (Robinson & Johnson 1996).
As is popularly known, states such as depression and posttraumatic stress disorder are often characterized by increased susceptibility to emotional distraction. It involves conscious and unconscious processes that draw attention away from a task. Moreover, Foerde, Knowlton, and Poldrack (2006) found evidence that memory performance could be modulated by distraction by using functional MRI (fMRI). On a theoretical level, distraction has been described as an important key in theories of emotion regulation (Zhang, Gross, & Hayne 2017).
According to the literature (Dolcos & McCarthy 2006; Schwager & Rothermund 2013), the neural systems try to mediate the detrimental effects of emotional distractors. These might be defined as emotional information that impairs cognitive functions due to a high attentional cost or a detrimental effect on inhibition. In this way, several authors have proven that emotional irrelevant information can capture attention from the task in question, in terms of latency components (Gupta, Hur, & Lavie 2016; Hodsoll, Viding, & Lavie 2011). Although many efforts have been made, it remains unclear whether there would be an effect of emotional valence on accuracy for the irrelevant distractors in conditions of low load. That is to say how emotional valence can interfere with the efficiency of the underlying basic cognitive process related to attention. For this reason, a mediation model among the variables described before was chosen. In this way, the type of analysis is related to a path analysis, which is of interest to examine the relationships between variables. In particular, this is a useful tool for the testing of a model and both direct and indirect effects on a given result (such as mediation and moderation among other relationships), under the basis of multiple regression. Moreover, it can popularly be understood as a particular case of structural equation modeling (SEM). For the purpose of the present study, this method is of interest, as it might allow us to examine the mediational role of distracting stimuli in latencies to emotional stimuli. Due to the above considerations, several results were expected. First of all, we expected a stronger correlation between accuracy and reaction time under emotional conditions, indicating a cognitive cost. Finally, we expected that latencies under distracting stimuli would mediate the recognition in terms of target latencies and accuracy variables, depicting working memory (WM) and inhibition processes.
A sample of 95 university students took part in the experiment (62 women and 33 men, with an average age of 25.12 years and SD = 3.10). In terms of inclusion criteria, all the participants had normal or corrected to normal vision, were native Spanish speakers and did not report cognitive or neurological disorders after a personal interview.
Average valence for the selected words in the different sets (standard deviation in parenthesis)
Participants were tested in a quiet room, in groups of three or four. The presentation of stimuli and recording of response times were controlled by a Windows operating system through the DMDX software (Forster & Forster 2003). The experiment consisted of two phases. In the first phase, 45 target stimuli were randomly presented (divided into 15 stimuli for each of the three valence categories) with short exposures of 2 s each. In the second phase (15 min after the participants were distracted by performing Stroop tasks), 45 target stimuli plus the 45 distracting stimuli were randomly presented. Each word was presented until the participant gave a response or 2000 ms had passed. The participants were instructed to press a button (labeled “Yes”) if the stimulus was a target stimulus and press another button (labeled “No”) if the stimulus was a distractor stimulus. The participants were also instructed to respond as quickly as possible while maintaining a reasonable level of accuracy. The session lasted approximately 30 min.
Design and data analysis
Response time averages (ms), error rate, and standard deviation (SD) for different experimental conditions
The ANOVA of RT showed that differences in emotional valence (where negative stimuli was recognized slower) were close to but did not reach statistical significant: F(2, 188) = 2.94; MSE = 16,329.33; η2 = 0.03; p = 0.055. Bonferroni’s pairwise comparison approached but did not reached the statistically significant for negative versus positive stimuli (p = 0.06). In the case of distracting and target conditions, target stimuli were processed faster than distractors, and this difference reached statistical significance: F(1,94) = 61.25; MSE = 1,131,718.40; η2 = 0.39; p < 0.01. Any interaction or error differences did not reach statistical significance (F < 1).
On the other hand, the ANOVA of on accuracy showed that differences in emotional valence (where positive stimuli was recognized slower) reached the statistical significant, F(2, 188) = 8.33; MSE = 0.015; η2 = 0.081; p < 0.01. In the case of distracting and target conditions, target stimuli were processed faster than distractors, and this difference reached the statistical significance: F(1,94) = 5.38; MSE = 0.434; η2 = 0.054; p < 0.05. All Bonferroni’s pairwise comparison between negative versus positive/neutral stimuli were statistically significant for emotion (p < 0.05), but neutral versus positive differences did not reach the statistical level. An interaction (emotion*presentation) was found across variables: F(2, 188) = 6.99; MSE = 0.016; η2 = 0.069; p < 0.01.
Pearson coefficients across RT, accuracy, emotional valence, and condition (target and distracting)
Conclusions and discussion
Emotions are considered distractions that often prompt subsequent actions. The aim of this work was to examine the role of distracting stimuli on the relationship of RT and accuracy. Understanding the mechanisms by which emotion impairs cognitive functions has important implications in several fields, such as affective disorders. Moreover, and according to Dolcos and McCarthy (2006), the neural systems that mediate the effects of emotion on goal-directed cognitive processing remain unclear.
The results could be described as follows: (i) First of all, changes in task demands should distract from the secondary task to the extent that these task demands implicate and affect accuracy, (ii) the distracting task mediates between the target task and accuracy under emotional stimuli, (iii) negative distracting stimuli seem to have a higher mediational effect than neutral or positive distracting stimuli, and (iv) positive distracting stimuli seem to have a higher mediational effect than neutral distracting stimuli.
As expected from the literature, latencies to distracting words presented higher RT. This indicates a cognitive cost in rejecting the second demand in a task. Moreover, and as it was hypothesized, RTs were inversely correlated to accuracy in most of the cases, in particular, under emotional conditions (as expected from previous literature (León Gordillo et al. 2010; Moreno-Cid et al. 2015). In this way, a mediational effect was found from distracting stimuli, except for the neutral ones. This might emphasize the role of emotion on memory, as a bias described before. Moreover, this type of approach could be considered as an extra value of the present work, as traditional analyses of variance, such as ANOVA, might be implemented by taking advantage of other more sophisticated analyses (Moret-Tatay et al. 2017).
In sum, our results showed that distraction should be intermediate under emotional conditions. Moreover, a stronger prediction from the negative stimuli was found. This hypothesis has received strong empirical support that negative stimuli generally hold more attention than neutral or positive stimuli, even for mood-congruent cognitions (Van Dillen & Koole 2007). This work also presents potential limitations. There are remarkably high error rates, which indicate that the task might be difficult for participants indicating a floor effect. For future research, it would be interesting to develop an easier series of experiments that might also examine the role attentional demands as indicated by several authors (Moret-Tatay et al. 2014; Moret-Tatay & Perea 2011; Navarro-Pardo, Navarro-Prados, Gamermann, & Moret-Tatay 2013) and its possible interactions with emotional valence.
This research was sponsored by The Generalitat Valenciana (Ajudes per a la realització de projectes de I + D per a equips d’investigació emergents, GV/2016/188) and the Universidad Catolica de Valencia San Vicente Mártir (ayudas internas, 2016-198-001/PRUCV/2015/630).
CMT participated in the study conception and design, acquisition of data, analysis, and interpretation of data and drafting of manuscript. MJB-A participated in the analysis and interpretation of data and drafting of manuscript. AL participated in the study conception and design, acquisition of data, analysis and interpretation of data, and drafting of manuscript. CRO participated in the analysis and interpretation of data and rafting of manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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