Dar Meshi

Michigan State University | MSU · College of Communication Arts and Sciences

Our reputation is important to us; we've experienced natural selection to care about our reputation. Recently, the neural processing of gains in reputation (positive social feedback concerning one's character) has been shown to occur in the human ventral striatum. It is still unclear, however, how individual differences in the processing of gains i...

Social media use is a global phenomenon, with almost two billion people worldwide regularly using these websites. As Internet access around the world increases, so will the number of social media users. Neuroscientists can capitalize on the ubiquity of social media use to gain novel insights about social cognitive processes and the neural systems t...

Background and aims: Online social networking sites (SNSs) like Facebook provide users with myriad social rewards. These social rewards bring users back to SNSs repeatedly, with some users displaying maladaptive, excessive SNS use. Symptoms of this excessive SNS use are similar to symptoms of substance use and behavioral addictive disorders. Impor...

Social media users often engage with more than one platform, spending almost three hours per day on these sites. These platforms provide social rewards to individuals, reinforcing their use. Importantly, due to this inherently reinforcing nature, some individuals may develop problematic social media use (PSMU), where they continue to use social med...

Over 70% of Americans use social media platforms, like Instagram. With this high prevalence, researchers have investigated the relationship between social media use and psychological well-being. Extant research has yielded mixed results, however, as most measures of social media use are self-reported and focus on amount of use. Even when studies ac...

Social media data, such as photos and status posts, can be tagged with location information (geotagging). This geotagged information can be used for urban spatial analysis to explore neighborhood characteristics or mobility patterns. With increasing rural-to-urban migration, there is a need for comprehensive data capturing the complexity of urban s...

Purpose of Review In this article, we review and integrate the extant literature on problematic social media use (PSMU) and impulsivity. We present this literature organized by methodology, in which researchers used surveys or behavioral tasks to measure either general impulsivity or specific facets of impulsivity. Recent Findings We found 17 publ...

Children's screentime has been linked with a variety of behavioral consequences, including decreased inhibitory control. While children's screentime is associated with distinct functional brain differences, the links between screentime and neural markers of inhibitory control are unknown. Therefore, we examined these relationships in a pilot study...

Almost four billion people worldwide use social media platforms. For some individuals, the social rewards obtained on these sites can lead to problematic social media use (PSMU). Research attempting to understand social media use in general has found relationships with various types of social comparison, but no study has yet investigated PSMU with...

The medial temporal lobe (MTL), including the hippocampus (HC), perirhinal cortex (PRC), and parahippocampal cortex (PHC), is central to memory formation. Reward enhances memory through interplay between the HC and substantia nigra/ventral tegmental area (SNVTA). While the SNVTA also innervates the MTL cortex and amygdala (AMY), their role in rewar...

Smartphone ownership and use continues to proliferate, allowing people to easily access online communication, entertainment, and information. Importantly, individuals can perceive that they overuse their smartphone and/or the social media applications (apps) they access on their devices. Much of the research on smartphone overuse has focused on you...

People are hyperaware of themselves. Research on the spotlight effect has shown that hyperawareness leads people to overestimate how much others notice about themselves. However, people are not always self-aware. What happens to the spotlight effect when people lack self-awareness? Across two studies, we attempt to elicit a reverse spotlight effect...

Behavioral addictive disorders (BADs) are syndromes similar to substance use disorders (SUDs) but with a focus on behaviors rather than on use of psychoactive substances. These non-substance-related disorders occur when typical, rewarding behaviors, such as gambling, playing video games, and using social media, are done in excess, affecting daily f...

Event-related potentials (ERPs) capture neural responses to media stimuli with a split-second resolution, opening the door to examining how attention modulates the reception process. However, the relatively high cost and difficulty of incorporating ERP methods have prevented broader adoption. This study tested the potential of a new mobile, relativ...

Objectives: Previous research on social media use (SMU) and mental health has focused on younger individuals. For example, in young adults active SMU (e.g. posting content) has been related to decreased depressive symptoms, whereas passive SMU (e.g. browsing content) has been related to increased depressive symptoms. These relationships have not y...

Problematic gamers may focus on game-play so much that they forego regular daily activities in favor of more game time, leading to health impairments. Because problematic gamers often desire to return to the game as quickly as possible, they are known to make myopic choices that favor short-term benefits at the cost of long-term gains. The present...

Disordered social media use, often referred to as “social media addiction”, has not been officially recognized by medical bodies such as the American Psychiatric Association or the World Health Organization. However, websites still present information to laypeople on how to treat and manage social media addiction, which can pose the risk of spreadi...

Background and aims People can engage in excessive, maladaptive use of social media platforms. This problematic social media use mirrors substance use disorders with regard to symptoms and certain behavioral situations. For example, individuals with substance use disorders demonstrate aberrations in risk evaluations during decision making, and init...

Media use appears to adversely affect sleep quality. Yet, findings remain inconsistent based on medium, duration, and manner of use. Given the recent, widespread rise in consumption of video-on-demand services and social media platforms, problematic use of these media has become of interest to media and sleep researchers. Although research has look...

Social media platforms allow people to connect with each other and obtain social rewards. In some individuals, these reinforcing rewards can induce maladaptive, problematic social media use, with symptoms similar to substance use disorders. This problematic social media use has been associated with poorer mental health. Previous studies have demons...

The COVIDiSTRESS global survey collects data on early human responses to the 2020 COVID-19 pandemic from 173 429 respondents in 48 countries. The open science study was co-designed by an international consortium of researchers to investigate how psychological responses differ across countries and cultures, and how this has impacted behaviour, copin...

Forming new memories is a fundamental part of human life, and the medial temporal lobe (MTL) is central to memory formation. Recent research suggests that within MTL, the perirhinal and parahippocampal cortices (PRC, PHC) process object and scene memory, respectively, whereas the hippocampus (HC) is agnostic to stimulus category. It is unclear, how...

Human decisions are often influenced by emotions. An economically relevant example is the role of fear in generating loss aversion. Previous research implicates the amygdala as a key brain structure in the experience of fear and loss aversion. The neural mechanism behind emotional influences on loss aversion is, however, unclear. To address this, w...

Introduction Facebook and Snapchat employ different features for encouraging repeated, reinforced use of their platforms. Importantly, this repeated use can become maladaptive and problematic. We sought to understand differences between these platforms in terms of problematic use, its motivations and outcomes. We specifically focused on trait socia...

Envy is the painful or resentful awareness of another’s advantage combined with a desire to possess that same advantage. Recent neuroscientific research has begun to shed light on the brain regions that process the experience of envy, including regions of the prefrontal cortex involved in emotional processing and social cognition. It is still uncle...

In this special issue devoted to speaking across communication subfields, we introduce a domain general explanatory framework that integrates biological explanation with communication science and organizes our field around a shared explanatory empirical model. Specifically, we draw on David Marr’s classical framework, which subdivides the explanati...

Playing video games can become problematic, interfering with gamers’ daily functioning. This problematic gaming is associated with negative mental health outcomes, such as depression and anxiety. Social support, provided in the real-world, can protect against mental health disorders such as depression and anxiety. However, previous research on gami...

Around the world, people display maladaptive, problematic use of online social networking sites (SNSs), like Facebook, Snapchat, and Instagram. The symptoms of this problematic SNS use are similar to symptoms of substance use and behavioral addictive disorders, such as relapse when attempting to quit. Individuals with substance use and behavioral a...

The human brain is our primary biological organ of communication. The brain acts as both the sender and receiver of messages and underpins our fundamental ability to communicate and interact with others. Communication scholars can, therefore, study the brain to gain a more complete understanding of communication phenomena. Our goal with the present...

Background: Social isolation in older adults is associated with numerous adverse health outcomes. In today's digital society, if individuals perceive themselves to be socially isolated, they can take steps to interact with others on social media platforms. Research with younger adults indicates that social media use is positively linked to social...

In this article, we hypothesize, and then demonstrate, that experiences of embarrassment have significantly increased in the United States, due in part, to the current situation in American politics under President Donald Trump. We provide support for our hypothesis by conducting both qualitative and quantitative analyses of Twitter posts in the U....

Physician rating websites allow users to check physicians’ profiles, write reviews, or rate their performance. The opinion of other users regarding a physician can affect our decision to visit her/him. To investigate the specific role of the number of users rating a physician when choosing a physician with support of these platforms, we used a Judg...

Humans tend to present themselves in a positive light to gain social approval. This behavioral trait, termed social desirability, is important for various types of social success. Surprisingly, investigation into the neural underpinnings of social desirability has been limited and focused only on interindividual differences in dopamine receptor bin...

Within the last year, expressions of second-hand embarrassment on Twitter significantly increased. We show how this relates to the current situation in U.S. politics under Trump and provide two explanations for why people feel this way in response to his actions. First, compared to former politicians, Trump’s norm violations seem intentional. Secon...

Conflict is a ubiquitous feature of interpersonal relationships, yet many of these relationships preserve their value following conflict. Our ability to refrain from punishment despite the occurrence of conflict is a characteristic of human beings. Using a combination of behavioral and neuroimaging techniques, we show that prosocial decision making...

Human beings are social animals and they vary in the degree to which they share information about themselves with others. Although brain networks involved in self-related cognition have been identified, especially via the use of resting-state experiments, the neural circuitry underlying individual differences in the sharing of self-related informat...

Social distance (i.e., the degree of closeness to another person) affects the way humans perceive and respond to fairness during financial negotiations. Feeling close to someone enhances the acceptance of monetary offers. Here, we explored whether this effect also extends to the spatial domain. Specifically, using an iterated version of the Ultimat...

The Fall 2011 issue of this journal published a two-paper section on “Neuroeconomics.” One paper, by Ernst Fehr and Antonio Rangel, clearly and concisely summarized a small part of the fast-growing literature. The second paper, “It’s about Space, It’s about Time, Neuroeconomics, and the Brain Sublime,” by Marieke van Rooij and Guy Van Orden, is bea...

Human vision uses saccadic eye movements to rapidly shift the sensitive foveal portion of our retina to objects of interest. For vision to function properly amidst these ballistic eye movements, a mechanism is needed to extract discrete percepts on each fixation from the continuous stream of neural activity that spans fixations. The speed of visual...

People often use expert advice when making decisions in our society, but how we are influenced by this advice has yet to be understood. To address this, using functional magnetic resonance imaging, we provided expert and novice advice to participants during an estimation task. Participants reported that they valued expert advice more than novice ad...

Environmental enrichment increases adult hippocampal neurogenesis and alters hippocampal-dependent behavior in rodents. To investigate a causal link between these two observations, we analyzed the effect of enrichment on spatial learning and anxiety-like behavior while blocking adult hippocampal neurogenesis. We report that environmental enrichment...

Genomewide association studies may offer the best promise for genetic mapping of complex traits. Such studies in outbred populations require very densely spaced single-nucleotide polymorphisms. In recently founded population isolates, however, extensive linkage disequilibrium (LD) may make these studies feasible with currently available sets of sho...