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Throughout my young adulthood, I spotted my grandma through the glass of a café. I felt astonished – she had departed the prior year. I stared for a brief period, then recalled it couldn't be her.

I'd experienced similar situations all through my life. Occasionally, I "recognized" a person I didn't know. At times I could promptly pinpoint who the stranger resembled – like my grandma. Other times, a face simply had a vague familiarity I couldn't recognize.

Exploring the Spectrum of Facial Recognition Capabilities

Recently, I became curious if others have these peculiar situations. When I inquired my acquaintances, one mentioned she frequently sees persons in unpredictable places who look known. Others occasionally confuse a unfamiliar individual or famous person for someone they know in real life. But some mentioned no such experiences – they could easily recognize people they'd met and people they hadn't.

I felt fascinated by this diversity of perceptions. Was it just desire that made me see my grandma that day – or some kind of mental glitch? Studies has found we spend about approximately 900 seconds of every hour looking at faces – do we just err sometimes? I was commencing to comprehend that we can all see the same face but not perceive the same thing.

Understanding the Spectrum of Facial Recognition Abilities

Researchers have developed many tests to quantify the capacity to recall faces. There exists a wide range: at one side are super-recognizers, who remember faces they have seen only for a short time or a long time ago; at the other are people with prosopagnosia, who often struggle to recognize family, intimate companions and even themselves.

Some tests also capture how skilled someone is at determining if they have not seen a face before. This is where I believe I fall short. But researchers "haven't thoroughly investigated this" as much as they've examined the skill to remember a face, according to neuroscience experts. It does seem that the two capabilities use distinct brain functions; for instance, there is proof that superior face rememberers and those with facial agnosia do about as well as each other at identifying new faces, despite their wildly different abilities to remember old faces.

Completing Facial Recognition Tests

I felt interested whether these tests would shed some light on why unfamiliar individuals look known. Was I someone who always remembers a face? I often recognize people more than they recall me, and feel let down – a feeling that experts say is frequent for superior face rememberers. But maybe I hyper-recognize faces – to the degree that even some new faces look recognizable.

I was sent several facial recognition tests. I completed them, feeling stumped at times. In one, called the facial recall assessment, I had to look at grayscale photos of a face from multiple perspectives, then find it in groups. During another test that directed me to pick out famous people from a mix of photos, many of the faces felt at least recognizable, but I couldn't precisely recognize them – similar to my everyday experience.

I felt uncertain about my performance. But after analysis of my performance, I had accurately recognized 96% of the public figure faces. The conclusion was that I qualified as a "near-exceptional facial identifier".

Comprehending Incorrect Identification Rates

I also did exceptionally in the known/unknown countenances task, which was described as especially effective for assessing someone's recognition for faces. The subject looks at a collection of 60 grayscale photos, each of a distinct face. Then they look through a sequence of 120 analogous photos – the initial collection plus 60 unfamiliar countenances – and indicate which were in the first set. The exceptional facial identifier threshold is roughly 80%; I recalled 78% of the faces I'd seen. On the other end of the spectrum, people with prosopagnosia properly recognize an average of 57%.

I felt content with my result, but also surprised. I recalled many of the previously seen countenances, but infrequently confused a new face for one that I'd seen before. My score on this metric, called the mistaken recognition percentage, 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 grandma's?

Investigating Possible Reasons

It was theorized that I probably possessed some superior face rememberer abilities. Everyone has a database of the faces we know in our recall, but super-recognizers – and possibly near-exceptional individuals like me – have a comparatively extensive and high-resolution catalogue. We're also possibly to differentiate visages – that is, attribute characteristics to each face, such as approachability or rudeness. Research suggests that the latter helps people to acquire and retain faces to permanent recall. While distinguishing may help me recall people, it may also trick me into seeing my elderly relative in a woman who has a similar air.

In addition, it was thought I might be "an active face perceiver", meaning I pay a lot of attention to faces. Others may have more mistaken recognition moments, thinking they recognize someone they don't know. But because I tend to look closely at faces, I am disposed to notice the unknown person who similar to my elderly relative. Indeed, one companion who said she doesn't make face identification mistakes admitted she doesn't really look at the people around her.

Researching Hyperfamiliarity for Faces

These evaluations helped me understand where I positioned on the continuum. But I wanted to understand more about what is happening in the brain when we "identify" strangers. Researching further, I read about a condition called over-familiarity with countenances (HFF), in which unfamiliar faces appear recognizable. Superficially, this sounded like it could pertain to me. But the handful of recorded occurrences all occurred after a medical episode such as a convulsion or stroke, unlike the idiosyncrasy that I've been experiencing my whole grown-up existence.

Through scientific platforms, experts have heard from about 24,000 those with facial agnosia, as well as people with all kinds of person recognition difficulties, including sight abnormalities, like when faces appear to be melting. Researchers study many of these people, using instruments like the old/new faces task and the Cambridge Face Memory Test.

Experts have heard from only a handful of people with suspected HFF in long durations of research.

"The frequency is quite low," one expert said of HFF. However, they speculated that there may be a range, with some people who think all visages is known, and others, like me, who only encounter it a multiple instances a month.

{Understanding