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In my mid-20s, I observed my grandmother through the pane of a coffee house. I felt astonished – she had departed the prior year. I gazed for a moment, then remembered it couldn't be her.

I'd encountered comparable occurrences all through my life. From time to time, I "knew" a person I didn't know. Sometimes I could quickly determine who the unknown individual reminded me of – for instance my elderly relative. In other instances, a countenance simply had a subtle recognition I couldn't recognize.

Exploring the Range of Facial Recognition Capabilities

In recent times, I began questioning if others have these odd encounters. When I inquired my friends, one said she frequently sees individuals in unpredictable places who look known. Others at times misidentify a unknown person or public figure for someone they know in actual life. But some described nothing of the kind – they could readily identify people they'd met and people they hadn't.

I felt curious by this diversity of experiences. Was it just yearning that made me see my grandmother that day – or some kind of cognitive error? Studies has found we spend about 14 minutes of every hour looking at faces – do we just have inaccuracies sometimes? I was beginning to realize that we can all see the same face but not experience the same thing.

Comprehending the Continuum of Face Identification Skills

Researchers have designed many assessments to assess the skill to recognize faces. There exists a broad spectrum: at one end are superior face rememberers, who recognize faces they have seen only momentarily or a distant past; at the other are people with prosopagnosia, who often have difficulty to recognize relatives, dear acquaintances and even themselves.

Some evaluations also assess how skilled someone is at recognizing if they have not seen a face before. This is where I suspect I have limitations. But scientists "just haven't dug into this" as much as they've examined the capacity to recall a face, according to cognitive neuroscientists. It does seem that the two abilities use distinct brain processes; for example, there is indication that exceptional facial identifiers and prosopagnosics do about as well as each other at identifying new faces, despite their vastly dissimilar abilities to remember old faces.

Completing Person Recognition Assessments

I felt interested whether these tests would offer understanding on why strangers look recognizable. Was I someone who always remembers a face? I often remember people more than they recognize me, and feel disappointed – a sentiment that experts say is typical for exceptional facial identifiers. But maybe I hyper-recognize faces – to the extent that even some new faces look familiar.

I was sent several facial recognition tests. I completed them, feeling confused at times. In one, called the memory for faces evaluation, I had to look at grayscale photos of a face from different viewpoints, then find it in groups. During another test that directed me to pick out celebrities from a mix of photos, many of the faces felt at least familiar, but I couldn't exactly identify them – comparable to my real-life experience.

I felt doubtful about my performance. But after evaluation of my performance, I had correctly identified 96% of the famous person faces. The determination was that I qualified as a "almost superior face rememberer".

Grasping Incorrect Identification Frequencies

I also excelled in the old/new faces task, which was described as especially effective for measuring someone's recognition for faces. The test-taker looks at a sequence of 60 monochrome photos, each of a different face. Then they look through a string of 120 analogous photos – the original series plus 60 new faces – and identify which were in the initial group. The superior face rememberer threshold is roughly 80%; I remembered 78% of the faces I'd seen. On the other side of the range, people with prosopagnosia correctly guess an average of 57%.

I felt content with my result, but also taken aback. I recognized many of the familiar visages, but seldom confused a unfamiliar countenance for one that I'd seen before. My score on this metric, called the mistaken recognition percentage, was 18%. Average identifiers, exceptional facial identifiers and those with facial agnosia all have a incorrect identification frequency of about 30% on average. So why was I mistaking a stranger's face for my elderly relative's?

Investigating Plausible Reasons

It was suggested that I probably possessed some superior face rememberer abilities. Everyone has a inventory of the faces we know in our memory, but exceptional facial identifiers – and probably almost superior rememberers like me – have a comparatively extensive and detailed catalogue. We're also likely to differentiate visages – that is, ascribe traits to each face, such as approachability or discourtesy. Studies suggests that the latter helps people to acquire and retain faces to long-term memory. 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 moreover, it was thought I might be "an engaged facial observer", 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 stranger who looks like my grandma. Indeed, one acquaintance who said she doesn't make person recognition mistakes confessed she doesn't really look at the people around her.

Researching Over-familiarity for Faces

These assessments helped me understand where I sat on the spectrum. But I wanted to understand more about what is happening in the brain when we "know" unfamiliar individuals. Examining further, I read about a disorder called hyperfamiliarity for faces (HFF), in which unfamiliar faces appear familiar. On the surface, this sounded like it could relate to me. But the small number of recorded occurrences all occurred after a physical event such as a epileptic episode or stroke, unlike the idiosyncrasy that I've been noticing my whole grown-up existence.

Through investigative websites, experts have heard from about 24,000 face-blind individuals, as well as people with all kinds of face identification difficulties, including sight abnormalities, like when faces appear to be melting. Researchers study many of these people, using instruments like the known/unknown countenances task and the Cambridge Face Memory Test.

Experts have heard from only a few of people with potential HFF in long durations of research.

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

{Understanding