In a new study published in Cortex, researchers have discovered that autistic adults exhibit a diminished neural response to their own faces compared to neurotypical adults, suggesting unique differences in self-referential processing. This research, using advanced brain imaging techniques, also indicates that these differences are specific to facial recognition and do not extend to how names are processed.
Autism, also known as Autism Spectrum Disorder (ASD), is a complex developmental condition characterized by challenges in social interaction, communication, and restricted or repetitive behaviors and interests. People with autism may have difficulty understanding social cues, may engage in repetitive behaviors such as hand-flapping or rocking, and often have intense interests in specific topics.
Past research has consistently shown that humans generally have a strong bias towards processing information related to themselves. This self-bias is believed to be crucial for social interactions and building accurate models of the social environment. Intriguingly, autistic individuals were found in previous studies to show potential differences in this self-referential processing.
Given the importance of faces and names in social interactions and their high relevance to oneself, understanding how these are processed differently in autism could provide key insights into the social challenges faced by autistic individuals.
“It has been becoming increasingly clear that there are differences in how individuals with autism process self-related information, and this may be linked to their social and communication difficulties,” explained study author Annabel Nijhof, a researcher at Ghent University. “With a relatively new EEG analysis technique, we could investigate potential brain differences in the response to one’s own name and own face in little more than a minute, between adults with and without autism.”
To delve into this, researchers recruited a total of 58 adults – 31 with an autism diagnosis and 27 neurotypical individuals. However, due to various reasons such as inability to provide the necessary images for the face task, attention check failures, and technical issues, the final participant count was adjusted to 20 autistic and 24 neurotypical individuals for the face task, and 27 autistic and 25 neurotypical individuals for the name task.
The researchers employed a sophisticated brain imaging technique known as Fast Periodic Visual Stimulation with Electroencephalography (FPVS-EEG). This method involves presenting stimuli – in this case, faces and names – at rapid, periodic frequencies, allowing for the measurement of neural responses with a high degree of accuracy.
Participants were shown images of their own faces, faces of a close acquaintance, and faces of strangers, as well as their own name, the name of a close acquaintance, and unfamiliar names. The key was to measure the participants’ brain responses to these different stimuli and compare the patterns between autistic and neurotypical individuals.
In the task involving face recognition, neurotypical adults exhibited a stronger response to their own face compared to faces of acquaintances and strangers. However, autistic adults showed a reduced specific response to their own face, suggesting a unique difference in self-face recognition. This effect was not observed in the task involving name recognition, where both autistic and neurotypical adults showed similar patterns of neural response, primarily exhibiting familiarity effects (stronger responses to familiar names compared to stranger names).
These results imply that the diminished self-specific neural response in autistic individuals is particularly tied to facial recognition, and not to the processing of self-related information in general. This distinction is crucial as it sheds light on the nuanced ways in which social processing might be different for autistic individuals.
“Adults with autism showed a comparable neural response when seeing their own face and that of someone close to them, whereas adults without autism show stronger responses to seeing their own face (a ‘self-bias’),” Nijhof told PsyPost. “Contrarily, neither adults with nor without autism show differences in the neural response to their own or a close other’s name. Thus, there do appear to be self-specific differences in autism, but not across all domains of information processing.”
However, the study is not without its limitations. While the study’s sample size was consistent with similar studies in this field, a more extensive participant base in future research could provide even more robust findings. This research opens the door to further exploration into how autistic individuals process various types of self-related information, which could have significant implications for developing tailored approaches in education and therapy.
It is also possible that the distinct neural response to one’s own name, compared to other names, might not be immediately apparent but emerge at later stages of cognitive processing. “Because we wanted to design an experiment that was very quick (it took less than 8 minutes per person to test them on all conditions), we may not have been able to pick up on (differences in) slower, more effortful and in-depth brain responses to seeing your own face or name,” Nijhof explained.
The study, “Differences in Own-Face but not Own-Name Discrimination between Autistic and Neurotypical Adults: A Fast Periodic Visual Stimulation-EEG Study“, was authored by Annabel D. Nijhof, Caroline Catmur, Rebecca Brewer, Michel-Pierre Coll, Jan R. Wiersema, and Geoffrey Bird.