Matt Abrahams

Fear of public speaking and social evaluation has an evolutionary basis originating in ancestral groups of approximately 150 people, where status loss threatened access to essential resources such as food, shelter, and reproduction.

"Well, those of us who study this believe it actually has an evolutionary basis. That when our species was hanging around in groups of about 150 people, your relative status meant everything. And I'm not talking about who has the fancy car or who gets the most likes on social media. It's who got access to resources, food, shelter, reproduction. And if you did something that put your status at risk, that could be really bad news for you. So, those of us who study this believe it's ingrained in who we are to be very sensitive to anything that puts our status at risk." (said at 0:04:05)

The speaker is summarizing a widely recognized theoretical framework in evolutionary psychology and evolutionary psychiatry (e.g., social rank and sociometer theories combined with Dunbar's social brain hypothesis regarding ancestral group size around 150). In this framework, social anxiety and fear of social evaluation are hypothesized to have evolved because status loss or exclusion in ancestral hunter-gatherer groups severely reduced access to essential fitness resources and survival support. While empirical studies support the underlying psychological predictions—such as social anxiety being strongly tied to sensitivity to status loss and social threat—these evolutionary origins are theoretical models derived from comparative and observational data rather than directly provable historical facts.

• context: The scarring impact of status loss in social anxiety: An evolutionary perspective. (Journal of anxiety disorders 2022)

  "Evolutionary models suggest that social anxiety (SA) is associated with sensitivity to status loss... given the evolutionary postulated relationship between social status and physical fitness, sensitivity to status loss in SA is expected to extend to physically threatening events." (abstract, results)

  pubmedfull study (doi)

Child development research shows that adults speaking to children often preface new terms or concepts with filler words like 'um' or 'uh' to signal that important information follows.

"There's research in the child development literature that says when we speak to kids, before we say a new term or give a new idea, we will often preface it with a filler word, um or uh. We signal what's coming next is important" (said at 2:13:10)

Child development and psycholinguistic research demonstrates that speech disfluencies (such as filled pauses 'um' and 'uh') naturally and reliably occur in predictable distribution patterns, specifically before infrequent, complex, or discourse-new words. Experimental studies (e.g., eye-tracking tasks in toddlers) show that young children by age two use these disfluencies in real-time language comprehension to infer speaker intention and anticipate the introduction or labeling of novel referents. However, these disfluencies primarily reflect speaker cognitive processing/planning load rather than deliberate, intentional teaching signals.

• supports: Toddlers use speech disfluencies to predict speakers' referential intentions. (Developmental science 2011)

  "Disfluencies (e.g. filled pauses 'uh' and 'um') occur in predictable locations, such as before infrequent or discourse-new words. We conducted an eye-tracking study to investigate whether young children can make use of this distributional information in order to predict a speaker's intended referent. Our results reveal that young children (ages 2;4 to 2;8) reliably attend to speech disfluencies early in lexical development and are able to use disfluencies in online comprehension to infer speaker intention in advance of object labeling." (abstract, passage verified)

  pubmedfull study (doi)