Conflict-Elicited Negative Evaluations of Neutral Stimuli: Testing Overt Responses and Stimulus-Frequency Differences as Critical Side Conditions

The neural dynamics of conflict adaptation induced by conflict observation: Evidence from univariate and multivariate analysis

Conflict adaptation can be expressed as greater performance (shorter response time and lower error rate) after incongruent trials when compared to congruent trials. It has been observed in designs that minimize confounding factors, i.e., feature integration, contingency learning, and temporal learning. Our current study aimed to further elucidate the temporal evolution mechanisms of conflict adaptation. To address this issue, the current study employed a combination of behavioral, univariate, and multivariate analysis (MVPA) methods in a modified color-word Stroop task, where half of the trials required button presses (DO trials), and the other half only required observation (LOOK trials). Both behavioral and the ERP results (N450 and SP) in the LOOK-DO transition trials revealed significant conflict adaptation without feature integration, contingency learning, and temporal learning, providing support for the conflict monitoring theory. Furthermore, during the LOOK trials, significant Stroop effect in the N450 and SP components were observed, indicating that conflict monitoring occurred at the stimulus level and triggered reactive control adjustments. The MVPA results decoded the congruent-incongruent and incongruent-incongruent conditions during the conflict adjustment phase but not during the conflict monitoring phase, emphasizing the unique contribution of conflict adjustment to conflict adaptation. The current research findings provided more compelling supporting evidence for the conflict monitoring theory, while also indicating that future studies should employ the present design to elucidate the specific processes of conflict adaptation.

Perceived conflict may be negative but resolved conflict is not

The current study investigated how exposure to a conflict stimulus influences the judgment of a subsequent stimulus's valence. We used an affective priming paradigm, presenting a color Stroop stimulus as a prime and a face as a target for an emotion recognition task. When the task for the prime was passive viewing (Experiment 1), congruent primes resulted in faster responses to emotionally positive targets than negative targets. However, this positivity bias disappeared following incongruent primes. In Experiment 2, instead of passive viewing, participants were asked to indicate the congruency of the prime, and the positivity bias was significant following the congruent prime but not following the incongruent prime. In Experiments 3 and 4, participants performed the conventional Stroop task on the prime, therefore resolving the conflict when the prime was incongruent. Experiment 3 adopted an equal proportion of congruent and incongruent primes. Experiment 4 adopted twice as many congruent primes as incongruent primes. In both experiments, the positivity bias was not significant regardless of the congruency of the prime. These results suggest that detecting conflict may interfere with positive affect or promote negative affect, therefore reducing the positivity bias. Once the conflict is resolved, however, the negative valence may disappear.

Cognitively demanding stimuli can acquire positive valence

Generally, people tend to avoid stimuli that require mental effort; effort can generate negative emotions. However, employing mental effort can also promote positive emotions, given a successful outcome. We investigated whether the level of cognitive effort associated with stimuli will elicit positive or negative emotions. In Experiment 1, participants performed a gender Stroop task during the association phase. The actors from the Stroop task expressed emotionlessness, while half of the actors were displayed in the mostly incongruent (MI) condition and the rest in the mostly congruent (MC) condition. In the transfer phase, we used the same actors for the emotion discrimination task, and the actors expressed a positive emotion half of the time and a negative emotion for the other half. For the MI actors, participants responded faster to positive emotion than to negative emotion, but this difference was not significant for the MC actors. In Experiment 2, the association phase involved a task switching paradigm in which half of the actors were presented in the mostly switching (MS) condition and the other in the mostly repetition (MR) condition. In the transfer phase, the same individuals' faces were used for emotion discrimination. For the MS actors, but not the MR actors, the responses were faster to positive emotion than to negative emotion. Our results imply that stimuli associated with more cognitive effort (i.e., MI and MS stimuli) may be perceived as more positive after a successful outcome of a task, although future research is required to replicate these findings.

Polarities influence implicit associations between colour and emotion

Colours are linked to emotional concepts. Research on the effect of red in particular has been extensive, and evidence shows that positive as well as negative associations can be salient in different contexts. In this paper, we investigate the impact of the contextual factor of polarity. According to the polarity-correspondence principle, negative and positive category poles are assigned to the binary response categories (here positive vs. negative valence) and the perceptual dimension (green vs. red) in a discrimination task. Response facilitation occurs only where the conceptual category (valence) and the perceptual feature (colour) share the same pole (i.e., where both are plus or both are minus). We asked participants (n = 140) to classify the valence of green and red words within two types of blocks: (a) where all words were of the same colour (monochromatic conditions) providing no opposition in the perceptual dimension, and (b) where red and green words were randomly mixed (mixed-colour conditions). Our results show that red facilitates responses to negative words when the colour green is present (mixed-colour conditions) but not when it is absent (monochromatic conditions). This is in line with the polarity-correspondence principle, but colour-specific valence-affect associations contribute to the found effects.

Situation selection and cognitive conflict: explicit knowledge is necessary for conflict avoidance

Humans transform their environment in order to regulate their own affect. One way to do so is to avoid situations that come with negative rather than positive affect. This selection might not solely bear on expectations of full-blown emotions, but may also be invoked by anticipating the aversiveness of cognitive conflict, when a situation suggests competing behavioural responses. If cognitive conflict is indeed aversive, it may trigger affect regulation goals, which in turn influence choices of situations depending on the magnitude of conflict they contain. People should prefer actions that produce conflict-free situations to actions that produce conflicting situations. In three experiments, participants had to solve a Stroop task by freely choosing between response keys that were either associated with low-conflict or high-conflict in the subsequent trial. We find that people do not automatically prefer actions associated with conflict-free situations to actions that are associated with conflicting situations. They only do so, when they are explicitly informed about the contingency between action and congruency of an upcoming situation. This suggests that cognitive conflict, at least at the level of a standard conflict task as used here, is insufficient to invoke affect regulation processes.