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In my twenties, I spotted my grandma through the window of a coffee house. I felt astonished – she had died the prior year. I stared for a moment, then reminded myself it couldn't be her.

I'd encountered comparable occurrences all through my life. Periodically, I "recognized" a person I didn't know. Sometimes I could rapidly pinpoint who the unknown individual looked like – like my grandmother. In other instances, a countenance simply had a subtle recognition I couldn't identify.

Examining the Spectrum of Person Recognition Capabilities

Lately, I began questioning if other people have these odd encounters. When I questioned my friends, one mentioned she often sees individuals in unexpected places who look known. Others sometimes mistake a stranger or public figure for someone they know in real life. But some described nothing of the kind – they could effortlessly recognize people they'd met and people they hadn't.

I felt fascinated by this range of perceptions. Was it just longing that made me see my elderly relative that day – or some kind of mental glitch? Research has found we spend about approximately 900 seconds of every hour looking at faces – do we just make mistakes sometimes? I was commencing to comprehend that we can all see the same face but not interpret the same thing.

Comprehending the Spectrum of Person Recognition Abilities

Scientists have developed many evaluations to assess the ability to recognize faces. There exists a broad spectrum: at one end are super-recognizers, who recognize faces they have seen only for a short time or a considerable time past; at the other are people with prosopagnosia, who often find it challenging to recognize kin, intimate companions and even themselves.

Some evaluations also capture how good someone is at determining if they have not seen a face before. This is where I suspect I have limitations. But researchers "just haven't dug into this" as much as they've looked at the ability to remember a face, according to neuroscience experts. It does seem that the two skills use separate brain mechanisms; for case, there is indication that superior face rememberers and prosopagnosics do about as well as each other at identifying new faces, despite their extremely distinct abilities to recall old faces.

Undergoing Person Recognition Tests

I felt intrigued whether these tests would provide insight on why unfamiliar individuals look recognizable. Was I someone who always remembers a face? I often recall people more than they recall me, and feel disappointed – a emotion that scientists say is frequent for super-recognizers. But maybe I hyper-recognize faces – to the point that even some new faces look recognizable.

I obtained several person recognition tests. I completed them, feeling puzzled at times. In one, called the Cambridge Face Memory Test, I had to look at monochrome photos of a face from multiple perspectives, then find it in arrays. During another test that instructed me to pick out celebrities from a mix of photos, many of the faces felt at least known, but I couldn't quite place them – reminiscent to my real-life experience.

I felt less than confident about my outcome. But after assessment of my performance, I had accurately recognized 96% of the celebrity faces. The finding was that I qualified as a "near-exceptional facial identifier".

Grasping Mistaken Recognition Rates

I also did exceptionally in the previously seen/unfamiliar faces task, which was described as notably useful for measuring someone's memory for faces. The participant looks at a collection of 60 monochrome photos, each of a distinct face. Then they examine a series of 120 analogous photos – the original series plus 60 unknown visages – and identify which were in the initial group. The exceptional facial identifier cutoff is roughly 80%; I remembered 78% of the faces I'd seen. On the other end of the spectrum, people with face blindness accurately identify an average of 57%.

I felt pleased with my result, but also astonished. I remembered many of the old faces, but infrequently confused a unknown visage for one that I'd seen before. My score on this measure, called the false alarm rate, was 18%. Typical rememberers, super-recognizers and face-blind individuals all have a false alarm rate of about 30% on average. So why was I confusing a stranger's face for my elderly relative's?

Examining Plausible Causes

It was theorized that I probably possessed some exceptional facial identifier capacities. Everyone has a database of the faces we know in our memory, but exceptional facial identifiers – and possibly borderline straddlers like me – have a relatively large and detailed catalogue. We're also possibly to differentiate visages – that is, ascribe traits to each face, such as amiability or impoliteness. Studies suggests that the latter helps people to learn and store faces to enduring recollection. While differentiating may help me remember people, it may also trick me into seeing my elderly relative in a woman who has a similar air.

In moreover, it was believed I might be "a attentive countenance examiner", meaning I pay a significant focus to faces. Others may have more incorrect identification moments, thinking they recognize someone they don't know. But because I tend to look closely at faces, I am inclined to notice the unfamiliar individual who similar to my grandma. Indeed, one acquaintance who said she doesn't make face identification mistakes admitted she doesn't really look at the people around her.

Investigating Over-familiarity for Faces

These evaluations helped me understand where I sat on the range. But I wanted to understand more about what is happening in the brain when we "recognize" unknown people. Investigating further, I read about a condition called hyperfamiliarity for faces (HFF), in which unfamiliar faces appear familiar. Superficially, this sounded like it could apply to me. But the handful of reported cases all took place after a health incident such as a epileptic episode or brain attack, unlike the peculiarity that I've been observing my whole adult life.

Through investigative websites, experts have heard from about 24,000 those with facial agnosia, as well as people with all kinds of person recognition problems, including perceptual alterations, like when faces appear to be melting. Researchers study many of these people, using instruments like the previously seen/unfamiliar faces task and the facial recall assessment.

Experts have heard from only a few of people with possible HFF in many years of study.

"The prevalence 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 recognizable, and others, like me, who only encounter it a few times a month.

{Understanding