When Does Oxytocin Affect Human Memory Encoding? The Role of Social Context and Individual Attachment Style

The neuropeptide oxytocin plays an essential role in regulating social behavior and has been implicated in a variety of human cognitive processes in the social domain, including memory processes. The present study investigates the influence of oxytocin on human memory encoding, taking into account social context and personality, which have previously been neglected as moderators for how oxytocin affects memory encoding. To examine the role of social context of encoding, we employed an established experimental paradigm in which participants perform a word-categorization task in either a joint (social) or individual (non-social) setting. To investigate the role of socially relevant personality factors, participants’ adult attachment style (AAS) was assessed. Previous research has identified attachment style as a potent moderator of oxytocin effects in the social-cognitive domain, but here we investigated for the first time its role in memory encoding. Participants were invited in pairs and received either placebo or oxytocin intranasally. Forty-five minutes later, they were instructed to react to different word categories within a list of successively presented words. This task was performed individually in the non-social condition and simultaneously with the partner in the social condition. After a 24-h delay, memory for all words was tested individually in a surprise recognition memory test. Oxytocin effects on memory accuracy depended on participants’ AAS. Specifically, oxytocin positively affected memory for participants who scored low on attachment dependence (who find dependence on others uncomfortable), but negatively affected memory for high scorers (who are comfortable depending on others). Oxytocin effects were not moderated by social vs. non-social context at encoding, and we discuss reasons for this outcome. Regardless of encoding condition or personality, oxytocin led to more liberal responding in the recognition memory test, which was also reflected in significantly higher false alarm rates (FARs) and a trend towards higher hit rates (HRs) compared to placebo. Overall, our results are consistent with an interactionist view on oxytocin effects on human cognitive functioning. Future research should further examine how oxytocin affects response biases via previous encoding and the ways in which biological dispositions linked to attachment style affect the process of memory encoding

When do we confuse self and other in action memory? Reduced false memories of self-performance after observing actions by an out-group vs. in-group actor

Observing another person performing an action can lead to a false memory of having performed the action oneself – the observation-inflation effect. In the experimental paradigm, participants first perform or do not perform simple actions, and then observe another person perform some of these actions. The observation-inflation effect is found when participants later remember performing actions that they have merely observed. In this case, self and other are confused in action memory. We examined social conditions of this self-other confusion when remembering actions, specifically whether the effect depends on the observed actor’s group membership. In our experiment, we manipulated group membership based on physical appearance, specifically complexion of the hands. Fair-skinned participants observed either an in-group (i.e., fair-skinned) or an out-group (i.e., dark-skinned) actor. Our results revealed that the observed actor’s group membership moderated the observation-inflation effect: False memories were significantly reduced when the actor was from the out-group (vs. in-group). We found no difference to a control condition in which the actor wore black gloves, suggesting that distinctiveness of perceptual or sensory features alone (due to the out-group member’s dark skin) is not critical. We discuss these findings in light of social-neuroscience studies demonstrating the impact of an observed person’s group membership on motor simulation. Overall, our findings suggest that action memory can be affected by a ubiquitous feature of people’s social perception, that is, group-based social categorization of others.

Von Verteidigern und Entdeckern

Dieses Open-Access-Buch bietet eine Einführung in den Identitätskonflikt zwischen Verteidigern und Entdeckern. Basierend auf einer Studie mit 5000 Befragten aus vier europäischen Ländern zeigen die Autoren, dass sich Verteidiger und Entdecker im Hinblick auf ihre Zugehörigkeitskonzepte und das Ausmaß wahrgenommener Bedrohung durch Muslime und Geflüchtete unterscheiden. Differenzen zwischen beiden Gruppen lassen sich auch für die jeweils wahrgenommene gesellschaftliche Marginalisierung und politische Repräsentation finden. Die Studie weist zudem nach, dass mit verschiedenen Positionen im Identitätskonflikt auch unterschiedliche Konzepte von Demokratie verbunden werden

Ugandan and British individuals' views of refugees in their countries: An exploratory <scp>mixed‐methods</scp> comparison

Abstract: Using an exploratory mixed‐methods approach, we examined thoughts concerning refugees reported by participants from a non‐Western country, Uganda, and the United Kingdom (total N = 113). We explored whether, due to various sociocultural, political and geographic differences, critical features of refugee migration (e.g., migration forcedness and migration‐related perils) would be viewed differently by Ugandan and UK participants. An inductive qualitative content analysis of responses in an online survey yielded 11 categories with 40 subcategories revealing several similarities between Ugandan and UK participants. For instance, similar proportions of participants from both countries acknowledged refugees' suffering before their migration and the forced nature of refugees' migration. However, we also found that more British than Ugandan participants referred to perils refugees suffer during their journeys, possibly resulting from differences in refugees' migration routes (e.g., crossing other countries, travelling by dilapidated boats, migration duration). Furthermore, Ugandan but not British participants took pride in international praise their country received for its forthcoming treatment of refugees. There were no differences regarding the extent to which Ugandan and British individuals exhibited prejudice towards refugees or experienced threats from refugees. We discuss the theoretical and practical implications of our findings for refugee integration

I belong but I'm still sad: Reminders of Facebook increase feelings of belonging but do not facilitate coping with sadness.

One way in which people may cope with sadness is to seek positive social contact. We examined whether subtle reminders of Facebook increase positive mood and thus attenuate the interest in social activities that is typically enhanced by sad mood induction. Participants watched either a loss-related sad or neutral video and were afterwards presented with either a Facebook, positive (sun) or neutral (Word) icon. We then examined their mood and their desire to engage in social activities as well as their feeling of belonging. The presentation of the Facebook icon increased feelings of belonging, but it did not influence participants' other responses to the sad video. Participants reported more negative mood and a greater desire to engage in social activities after the sad (vs. control) video regardless of the icon condition. The results suggest that the activation of thoughts about Facebook can enhance users' feeling of belonging; however, this effect might not be sufficient to facilitate coping with loss-related sadness

The stressed eyewitness: the interaction of thematic arousal and post-event stress in memory for central and peripheral event information

Both arousal during the encoding of stimuli and subsequent stress can affect memory, often by increasing memory for important or central information. We explored whether event-based (thematic) arousal and post-event stress interact to selectively enhance eyewitnesses' memory for the central aspects of an observed incident. Specifically, we argue that memory for stimuli should be enhanced when (1) the stimuli are encoded under arousal (vs. non-arousal), and (2) stress is experienced soon after the encoding episode. We designed an experiment that extended previous research by manipulating arousal without changing the stimulus material, distinguishing between central and peripheral event information, and using a dynamic, life-like event instead of static pictures. After watching a video depicting a burglary under high or low thematic arousal, psychosocial stress was induced or not induced by the Trier Social Stress Test (TSST). Salivary cortisol was measured at standard intervals. Consistent with our prediction, we found a significant post-event stress × thematic arousal × centrality interaction, indicating that the recognition advantage for central event items over peripheral event items was most pronounced under both high thematic arousal and post-event stress. Because stress was induced after encoding this interaction cannot be explained by possible differences at encoding, such as narrowed attention. The centrality effect of post-event stress under high thematic arousal was statistically mediated by the cortisol increase, which suggests a key role of the stress hormone. We discuss implications of our findings for psychological and neuroscientific theories of emotional memory formation