Preferential processing of task-irrelevant beloved-related information and task performance: Two event-related potential studies

Mind wandering about the beloved: self-reported distraction, task performance, and enjoyment

Romantic love is associated with mind wandering about the beloved. We tested associations between mind wandering about the beloved and infatuation, attachment, self-reported distraction, task performance, and enjoyment. Participants who were in love completed self-report measures and a sustained attention response task with thought probes. Participants reported thinking about their beloved for 67% of the time in general and up to 42% of the time during task performance. Thinking about the beloved in general was positively associated with infatuation (passionate love) but not with attachment (companionate love). The more time participants reported thinking about their beloved in general, the more distracting they found it and the less they could withhold a response to no go stimuli. The more participants thought about their beloved during the task, the slower their responses to go stimuli were. In contrast to the negative terminology typically used to describe frequent thoughts about the beloved, such as intrusive or obsessive thinking, participants overwhelmingly enjoyed thinking about their beloved. The findings suggest that romantic love impairs cognitive task performance because people are thinking about their beloved instead, which may negatively impact performance at school and work. Nevertheless, people seem to greatly enjoy thinking about their beloved.

Toward consistent reporting of sample characteristics in studies investigating the biological mechanisms of romantic love

In this non-systematic review, we consider the sample reporting practices of 42 studies up to and including 2021 investigating the biological mechanisms of romantic love (i.e., 31 neuroimaging studies, nine endocrinological studies, one genetics study, and one combined neuroimaging and genetics study). We searched scientific databases using key terms and drew on our and other authors' knowledge to identify studies that investigated the mechanisms associated with romantic love using neuroimaging, endocrinological, and genetic methods. Only studies with a group or entire sample experiencing romantic love were included. The aim was to collate all relevant studies and determine the comparability of studies and ability to assess the generalizability of findings. We summarize how these studies report sex/gender, age, romantic love, relationship duration/time in love, and sample descriptors. We then outline the case for promoting comparability and the ability to determine generalizability in future studies. The findings indicate a limited ability to compare studies' samples or make an assessment of the generalizability of findings. Existing studies are not representative of the general population in a particular country or globally. We conclude by presenting ideas about how best to report sex, age, romantic love characteristics, relationship status, time in love, relationship duration, relationship satisfaction, type of unrequited love, sexual activity, cultural characteristics, socio-economic status, student status, and method-relevant descriptors. If our ideas are adopted, in part or in whole, we expect the comparability of studies to increase. Adopting our ideas will also make it easier to make an assessment of the generalizability of findings.

Self-interest is intuitive during opportunity (in)equity: Evidence from multivariate pattern analysis of electroencephalography data

Fairness is a remarkable preference for human society, involving both outcome and opportunity equity. Most previous studies have explored whether fairness itself or self-interest is intuitive during outcome (in)equity. However, intuition during outcome (in)equity can be affected by both fairness level and actual payoff. Since opportunity (in)equity is only affected by the fairness level, we explored only intuition during fairness by measuring event-related potential responses to opportunity (in)equity. Participants played a social non-competitive two-person choice game with advantage opportunity inequity (AI), opportunity equity (OE), and disadvantage opportunity inequity (DI). The behavioral results suggested an opportunity inequity bias, with greater feelings of fairness and pleasantness during OE than during AI and DI. However, multivariate pattern analysis of the event-related potential (ERP) data suggested that AI, OE, and DI can be significantly distinguished from each other in relatively early windows overlapping with early positive negativity (EPN), and AI and DI can be significantly further distinguished during a relatively late window overlapping with late positive potential (LPP). Moreover, the conventional ERP analysis found that EPN amplitudes were more negative for AI than for OE and DI, as well as for OE than for DI, suggesting a pleasure bias for increased self-interest. LPP amplitudes were greater for DI than for AI and OE, suggesting enhanced sensitivity to DI. These results suggest that self-interest is intuitive during opportunity (in)equity.

Electrophysiological Correlates of Romantic Love: A Review of EEG and ERP Studies with Beloved-Related Stimuli

Science is starting to unravel the neural basis of romantic love. The goal of this literature review was to identify and interpret the electrophysiological correlates of romantic love. Electroencephalography (EEG) and event-related potential (ERP) studies with a design that elicits romantic love feelings were included. The methods of previous EEG studies are too heterogeneous to draw conclusions. Multiple ERP studies, however, have shown that beloved stimuli elicit an enhanced late positive potential (LPP/P3/P300), which is not due to familiarity, positive valence, or objective beauty. This effect occurs in Western and Eastern cultures and for pictorial and verbal information, and results from bottom-up rather than top-down factors. Studies have also shown that beloved stimuli elicit an early posterior negativity (EPN), which also does not seem to be due to familiarity or positive valence. Data on earlier ERP components (P1, N1, P2, N170/VPP, N2) is scarce and mixed. Of course, the enhanced LPP and EPN are not specific to romantic love. Instead, they suggest that the beloved captures early attention, within 200–300 ms after stimulus onset that is relatively resource-independent, and subsequently receives sustained motivated attention. Future research would benefit from employing cognitive tasks and testing participants who are in love regardless of relationship status.

Increasing Love Feelings, Marital Satisfaction, and Motivated Attention to the Spouse

Abstract. Love typically decreases over time, sometimes leading to divorces. We tested whether positively reappraising the spouse and/or up-regulating positive emotions unrelated to the spouse increases infatuation with and attachment to the spouse, marital satisfaction, and motivated attention to the spouse as measured by the late positive potential (LPP). Married individuals completed a regulation task in which they viewed spouse, pleasant, and neutral pictures without regulation prompt as well as spouse and pleasant pictures that were preceded by regulation prompts. Event-related potentials were recorded, and self-reported infatuation, attachment, and marital satisfaction were assessed. Viewing spouse pictures increased infatuation, attachment, and marital satisfaction compared to viewing pleasant or neutral pictures in the no regulation condition. Thinking about positive aspects of the spouse and increasing positive emotions unrelated to the spouse did not increase infatuation, attachment, and marital satisfaction any further. Motivated attention, measured by the LPP amplitude, was greatest to spouse pictures, intermediate to pleasant pictures, and minimal to neutral pictures. Although the typical up-regulation effect on the LPP amplitude was observed for pleasant pictures, positively reappraising the spouse did not increase the LPP amplitude and hence motivated attention to the spouse any further. This study indicates that looking at spouse pictures increases love and marital satisfaction, which is not due to increased positive emotions unrelated to the spouse. Looking at spouse pictures is an easy strategy that could be used to stabilize marriages in which the main problem is the decline of love feelings over time.

Subjective ratings of fear are associated with frontal late positive potential asymmetry, but not with early brain activity over the occipital and centro-parietal cortices

The human frontal cortex is asymmetrically involved in motivational and affective processing. Several studies have shown that the left-frontal hemisphere is related to positive and approach-related affect, whereas the right-frontal hemisphere is related to negative and withdrawal-related affect. The present study aimed to investigate whether evolutionarily threatening stimuli modulate asymmetrical frontal activity. We examined hemispheric differences in frontal late positive potentials (f-LPP asymmetry) and frontal alpha power activation (frontal alpha asymmetry, FAA) in response to images depicting snakes, spiders, butterflies, and birds. Results showed that the late component of f-LPP asymmetry, but not FAA, was modulated by the category of stimuli. Specifically, threatening stimuli (snakes and spiders) evoked a relatively large late f-LPP over the right-frontal hemisphere than non-threatening stimuli (birds and butterflies). Moreover, this relatively great right-frontal activity was positively associated with the subjective ratings of fear. Importantly, the subjective ratings of fear were not associated with early brain activity over the occipital or centro-parietal cortices. These results suggest that late f-LPP asymmetry may reflect higher order affective processes, specifically the subjective appraisal of threatening stimuli and the subjective experience of fear, that are independent of the fast and automatic processing of evolutionarily significant and affectively arousing stimuli.