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In my twenties, I observed my grandma through the pane of a café. I felt stunned – she had passed away the year before. I stared for a moment, then remembered it was impossible to be her.

I'd had analogous occurrences during my life. Occasionally, I "identified" a person I had never met. Sometimes I could quickly pinpoint who the stranger reminded me of – for instance my grandmother. On other occasions, a countenance simply had a vague familiarity I couldn't recognize.

Examining the Spectrum of Facial Recognition Capabilities

Lately, I became curious if different individuals have these unusual situations. When I asked my friends, one said she frequently sees individuals in unexpected places who look known. Others at times misidentify a stranger or public figure for someone they know in real life. But some mentioned nothing of the kind – they could effortlessly distinguish people they'd met and people they hadn't.

I felt intrigued by this diversity of responses. Was it just desire that made me see my grandma that day – or some kind of cognitive error? Research has found we spend about a quarter-hour of every hour looking at faces – do we just have inaccuracies sometimes? I was starting to understand that we can all see the same face but not interpret the same thing.

Comprehending the Range of Person Recognition Abilities

Scientists have developed many tests to assess the ability to recognize faces. There exists a wide range: at one side are superior face rememberers, who remember faces they have seen only briefly or a considerable time past; at the other are people with face blindness, who often have difficulty to know family, dear acquaintances and even themselves.

Some tests also measure how good someone is at determining if they have not seen a face before. This is where I believe I fall short. But experts "just haven't dug into this" as much as they've examined the ability to remember a face, according to brain researchers. It does seem that the two capabilities use separate brain functions; for case, there is proof that superior face rememberers and face-blind individuals do about as well as each other at identifying new faces, despite their extremely distinct abilities to recognize old faces.

Undergoing Facial Recognition Tests

I felt intrigued whether these evaluations would provide insight on why strangers look known. Was I someone who never forgets a face? I often recall people more than they recognize me, and feel disappointed – a feeling that researchers say is typical for exceptional facial identifiers. But maybe I hyper-recognize faces – to the point that even some new faces look known.

I received several face identification tests. I completed them, feeling confused at times. In one, called the Cambridge Face Memory Test, I had to look at grayscale photos of a face from different viewpoints, then find it in arrays. During another test that directed me to pick out public figures from a mix of photos, many of the faces felt at least known, but I couldn't exactly identify them – comparable to my real-life experience.

I felt uncertain about my results. But after analysis of my results, I had properly distinguished 96% of the celebrity faces. The determination was that I qualified as a "near-exceptional facial identifier".

Comprehending False Alarm Frequencies

I also performed well in the known/unknown countenances task, which was described as notably useful for evaluating someone's recall for faces. The subject looks at a series of 60 grayscale photos, each of a separate face. Then they look through a string of 120 similar photos – the first group plus 60 unknown visages – and identify which were in the original collection. The superior face rememberer cutoff is roughly 80%; I remembered 78% of the faces I'd seen. On the other extreme of the spectrum, people with facial agnosia properly recognize an average of 57%.

I felt pleased with my performance, but also surprised. I recalled many of the previously seen countenances, but rarely misidentified a new face for one that I'd seen before. My score on this measure, called the incorrect identification frequency, was 18%. Average identifiers, super-recognizers and prosopagnosics all have a false alarm rate of about 30% on average. So why was I misidentifying a unfamiliar individual's face for my grandmother's?

Investigating Potential Explanations

It was theorized that I probably possessed some super-recognizer capacities. Everyone has a inventory of the faces we know in our recollection, but superior face rememberers – and possibly borderline straddlers like me – have a comparatively extensive and detailed catalogue. We're also possibly to distinguish countenances – that is, attribute traits to each face, such as approachability or impoliteness. Scientific investigation suggests that the latter helps people to acquire and retain faces to permanent recall. While differentiating may help me recall people, it may also mislead me into seeing my grandma in a woman who has a comparable demeanor.

In addition, it was considered I might be "an active face perceiver", meaning I pay a significant focus to faces. Others may have more mistaken recognition moments, thinking they identify someone they don't know. But because I tend to look closely at faces, I am prone to notice the unfamiliar individual who similar to my grandmother. Indeed, one friend who said she doesn't make face identification mistakes acknowledged she doesn't really look at the people around her.

Examining Excessive Recognition for Faces

These tests helped me understand where I sat on the continuum. But I wanted to understand more about what is happening in the brain when we "know" unfamiliar individuals. Examining further, I read about a condition called excessive facial recognition (HFF), in which unfamiliar faces appear recognizable. Superficially, this sounded like it could pertain to me. But the small number of documented instances all occurred after a medical episode such as a seizure or stroke, unlike the quirk that I've been noticing my whole grown-up existence.

Through scientific platforms, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of person recognition challenges, including visual distortions, like when faces appear to be dissolving. Researchers study many of these people, using instruments like the old/new faces task and the memory for faces evaluation.

Experts have heard from only a handful of people with possible HFF in many years of investigation.

"The prevalence is quite low," one expert said of HFF. However, they theorized that there may be a spectrum, with some people who think every face is known, and others, like me, who only undergo it a multiple instances a month.

{Understanding