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Inspired by early proposals in philosophy, dominant accounts of language posit a central role for mutual knowledge, either encoded directly in common ground, or approximated through other cognitive mechanisms. Using existing empirical evidence from language and memory, we challenge this tradition, arguing that mutual knowledge captures only a subset of the mental states needed to support communication. In a novel theoretical proposal, we argue for a cognitive architecture that includes separate, distinct representations of the self and other, and a cognitive process that compares these representations continuously during conversation, outputting both similarities and differences in perspective. Our theory accounts for existing data, interfaces with findings from other cognitive domains, and makes novel predictions about the role of perspective in language use. We term this new account the Multiple Perspectives Theory of mental states in communication. 

Wherever you look you are likely to see people on their phones, noses inches from the screen, browsing the internet, and especially spending time on social media. If you have used social media before, you know you can “like” posts, share them with friends, comment on them, and respond to what others have said. How do our brains remember social media? Do we remember social media posts better if we interact with them in some way? To study this, we asked people to view real Instagram posts and comment on some of them. Later, we tested their memory for these posts. We found that people were much more likely to remember the posts that they commented on. These results are important to consider when using social media. When we actively engage with social media, it is more likely to stick in memory, so we may need to choose wisely what we interact with to keep ourselves healthy. 

Abstract Written memoranda of conversations, or memcons, provide a near‐contemporaneous record of what was said in conversation, and offer important insights into the activities of high‐profile individuals. We assess the impact of writing a memcon on memory for conversation. Pairs of participants engaged in conversation and were asked to recall the contents of that conversation 1 week later. One participant in each pair memorialized the content of the interaction in a memcon shortly after the conversation. Participants who generated memcons recalled more details of the conversations than participants who did not, but the content of recall was equally and largely accurate for both participants. Remarkably, only 4.7% of the details of the conversation were recalled by both of the partners after a week delay. Contemporaneous note‐taking appears to enhance memory for conversation by increasing the amount of information remembered but not the accuracy of that information. These findings have implications for evaluating the testimony of participants on conversations with major political or legal ramifications. 

Social media is a routine part of every-day life for millions of people worldwide. How does engaging with social media shape enduring memories for that experience? This question is important given the popularity of certain types of content on social media platforms, such as content widely known as “fitspiration”. Two experiments involving 510 US adults (mean age = 36.82) examined memory for food and fitness-related social media images that individuals write comments about, as well as memory for other images in the context. We demonstrate that commenting on social media images boosts memory for them and weakly affects memory for conceptually related images in the same context. Exploratory analyses revealed correlations between self-reported disordered eating symptomology and effects of commenting on memory. These findings demonstrate that how people engage with social media has implications for the enduring memories of that content and may relate to behaviors and attitudes in offline lives, such as eating and body image.