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During my mid-20s, I observed my elderly relative through the pane of a coffee house. I felt stunned – she had passed away the prior year. I gazed for a moment, then reminded myself it couldn't possibly be her.

I'd experienced comparable occurrences all through my life. From time to time, I "recognized" an individual I didn't know. At times I could promptly identify who the unknown individual resembled – like my grandma. On other occasions, a visage simply had a indistinct knowingness I couldn't identify.

Investigating the Range of Facial Recognition Experiences

Lately, I started wondering if others have these peculiar experiences. When I asked my friends, one mentioned she often sees people in unpredictable places who look familiar. Others at times mistake a stranger or celebrity for someone they know in actual life. But some reported nothing of the kind – they could readily identify people they'd met and people they hadn't.

I felt curious by this range of experiences. Was it just desire that made me see my grandmother that day – or some kind of mental glitch? Scientific investigation 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 Spectrum of Person Recognition Capacities

Scientists have created many assessments to assess the ability to remember faces. There exists a extensive variety: at one end are exceptional facial identifiers, who recall faces they have seen only momentarily or a long time ago; at the other are people with prosopagnosia, who often find it challenging to recognize relatives, close friends and even themselves.

Some tests also measure how good someone is at telling if they have not seen a face before. This is where I think I fall short. But researchers "just haven't dug into this" as much as they've looked at the ability to recall a face, according to brain researchers. It does seem that the two abilities use different brain functions; for instance, there is indication that exceptional facial identifiers and those with facial agnosia do about as well as each other at identifying new faces, despite their wildly different abilities to recognize old faces.

Taking Person Recognition Tests

I felt interested whether these assessments would provide insight on why strangers look known. Was I someone who never forgets a face? I often recognize people more than they recognize me, and feel let down – a emotion that experts say is frequent for super-recognizers. But maybe I over-recognize faces – to the extent that even some new faces look known.

I received several facial recognition tests. I completed them, feeling puzzled at times. In one, called the Cambridge Face Memory Test, I had to look at black-and-white photos of a face from three angles, then find it in arrays. During another test that instructed 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 actual experience.

I felt doubtful about my outcome. But after assessment of my results, I had correctly identified 96% of the celebrity faces. The finding was that I qualified as a "near-exceptional facial identifier".

Comprehending Mistaken Recognition Rates

I also performed well in the known/unknown countenances task, which was described as especially effective for evaluating someone's recognition for faces. The subject looks at a sequence of 60 black-and-white photos, each of a distinct face. Then they examine a sequence of 120 analogous photos – the initial collection plus 60 unknown visages – and identify which were in the initial group. The exceptional facial identifier benchmark is roughly 80%; I recognized 78% of the faces I'd seen. On the other extreme of the spectrum, people with prosopagnosia accurately identify an average of 57%.

I felt pleased with my score, but also surprised. I remembered many of the previously seen countenances, but infrequently misidentified a unknown visage for one that I'd seen before. My score on this indicator, called the false alarm rate, was 18%. Typical rememberers, super-recognizers and prosopagnosics all have a incorrect identification frequency of about 30% on average. So why was I misidentifying a unfamiliar individual's face for my grandma's?

Investigating Plausible Causes

It was theorized that I possibly possessed some superior face rememberer capabilities. Everyone has a catalogue of the faces we know in our memory, but exceptional facial identifiers – and possibly near-exceptional individuals like me – have a comparatively extensive and detailed catalogue. We're also possibly to individuate faces – that is, ascribe characteristics to each face, such as amiability or rudeness. Scientific investigation suggests that the later element helps people to acquire and commit faces to permanent recall. While differentiating may help me recognize people, it may also trick me into seeing my elderly relative in a woman who has a analogous presence.

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 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 unknown person who resembles my elderly relative. Indeed, one acquaintance who said she doesn't make face identification mistakes admitted she doesn't really look at the people around her.

Investigating Excessive Recognition for Faces

These assessments helped me understand where I stood on the spectrum. But I wanted to understand more about what is happening in the brain when we "know" strangers. Researching further, I read about a syndrome called over-familiarity with countenances (HFF), in which unrecognized faces appear known. Superficially, this sounded like it could relate to me. But the few of recorded occurrences all took place after a health incident such as a seizure or cerebral accident, unlike the quirk that I've been observing my whole mature years.

Through scientific platforms, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of facial recognition problems, including visual distortions, like when faces appear to be dissolving. Researchers study many of these people, using methods like the known/unknown countenances task and the facial recall assessment.

Experts have heard from only a few of people with potential HFF in extended periods of investigation.

"The prevalence is quite low," one expert said of HFF. However, they theorized that there may be a continuum, with some people who think each countenance is familiar, and others, like me, who only experience it a multiple instances a month.

{Understanding