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In my mid-20s, I noticed my grandma through the window of a café. I felt astonished – she had departed the year before. I gazed for a short time, then recalled it couldn't possibly be her.

I'd had comparable situations during my life. Periodically, I "knew" someone I didn't know. Sometimes I could quickly determine who the unfamiliar person reminded me of – like my elderly relative. Other times, a visage simply had a indistinct knowingness I couldn't identify.

Exploring the Spectrum of Face Identification Experiences

Recently, I started wondering if other people have these peculiar experiences. When I asked my companions, one commented she often sees persons in random places who look recognizable. Others sometimes mistake a unfamiliar individual or famous person for someone they know in actual life. But some mentioned completely different responses – they could effortlessly distinguish people they'd met and people they hadn't.

I felt fascinated by this range of responses. Was it just longing that made me see my grandma that day – or some kind of brain malfunction? Scientific investigation has found we spend about approximately 900 seconds 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.

Grasping the Continuum of Face Identification Abilities

Scientists have designed many evaluations to measure the skill to recognize faces. There exists a wide range: at one end are superior face rememberers, who recall faces they have seen only for a short time or a considerable time past; at the other are people with face blindness, who often find it challenging to recognize kin, close friends and even themselves.

Some tests also capture how skilled someone is at recognizing if they have not seen a face before. This is where I think I fall short. But researchers "haven't extensively researched this" as much as they've examined the skill to recognize a face, according to brain researchers. It does seem that the two skills use different brain mechanisms; for case, there is evidence that super-recognizers and face-blind individuals do about as well as each other at discerning new faces, despite their vastly dissimilar abilities to remember old faces.

Undergoing Facial Recognition Assessments

I felt curious whether these tests would provide insight on why strangers look familiar. Was I someone who always remembers a face? I often remember people more than they recognize me, and feel let down – a sentiment that researchers say is frequent for superior face rememberers. But maybe I over-recognize faces – to the point that even some new faces look known.

I was sent several person recognition tests. I worked through them, feeling confused at times. In one, called the memory for faces evaluation, I had to look at grayscale photos of a face from three angles, then find it in groups. During another test that told me to pick out public figures from a mix of photos, many of the faces felt at least recognizable, but I couldn't precisely recognize them – comparable to my real-life experience.

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

Understanding Mistaken Recognition Rates

I also did exceptionally in the known/unknown countenances task, which was described as particularly good for evaluating someone's recall for faces. The participant looks at a collection of 60 black-and-white photos, each of a different face. Then they examine a string of 120 comparable photos – the first group plus 60 unknown visages – and identify which were in the original collection. The super-recognizer cutoff is roughly 80%; I recognized 78% of the faces I'd seen. On the other end of the spectrum, people with prosopagnosia correctly guess an average of 57%.

I felt content with my result, but also taken aback. I remembered many of the old faces, but infrequently mistook a unknown visage for one that I'd seen before. My performance on this metric, called the incorrect identification frequency, was 18%. Average identifiers, super-recognizers and face-blind individuals all have a mistaken recognition percentage of about 30% on average. So why was I misidentifying a unfamiliar individual's face for my grandmother's?

Examining Possible Causes

It was theorized that I probably possessed some super-recognizer capabilities. Everyone has a catalogue of the faces we know in our memory, but exceptional facial identifiers – and likely borderline straddlers like me – have a relatively large and high-resolution catalogue. We're also probably to individuate faces – that is, ascribe characteristics to each face, such as amiability or discourtesy. Studies suggests that the second aspect helps people to develop and store faces to long-term memory. While distinguishing may help me recall people, it may also trick me into seeing my grandmother in a woman who has a analogous presence.

In moreover, it was thought I might be "an active face perceiver", meaning I pay a significant focus 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 unfamiliar individual who similar to my grandma. Indeed, one companion who said she doesn't make person recognition mistakes admitted she doesn't really look at the people around her.

Investigating 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 "recognize" unfamiliar individuals. Researching further, I read about a condition called over-familiarity with countenances (HFF), in which unrecognized faces appear known. Superficially, this sounded like it could apply to me. But the handful of recorded occurrences all happened after a medical episode such as a seizure or stroke, unlike the peculiarity that I've been observing my whole adult life.

Through research sites, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of facial recognition difficulties, including sight abnormalities, like when faces appear to be dissolving. Researchers study many of these people, using methods like the known/unknown countenances task and the memory for faces evaluation.

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

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

{Understanding