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During my young adulthood, I spotted my grandmother through the window of a coffee shop. I felt astonished – she had passed away the prior year. I gazed for a short time, then remembered it couldn't possibly be her.

I'd encountered analogous situations during my life. From time to time, I "identified" a person I didn't know. Occasionally I could quickly determine who the stranger resembled – such as my grandma. Other times, a face simply had a subtle recognition I couldn't place.

Investigating the Variety of Face Identification Capabilities

Lately, I became curious if other people have these odd situations. When I questioned my companions, one said she regularly sees persons in unpredictable places who look recognizable. Others sometimes mistake a unfamiliar individual or famous person for someone they know in actual life. But some mentioned nothing of the kind – they could effortlessly identify people they'd met and people they hadn't.

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

Comprehending the Spectrum of Person Recognition Capacities

Investigators have created many tests to assess the skill to recognize faces. There exists a extensive variety: at one side are super-recognizers, who remember faces they have seen only momentarily or a considerable time past; at the other are people with facial agnosia, who often struggle to recognize kin, dear acquaintances and even themselves.

Some evaluations also measure how good someone is at recognizing if they have not seen a face before. This is where I suspect I am deficient. But experts "just haven't dug into this" as much as they've studied the ability to remember a face, according to neuroscience experts. It does seem that the two abilities use distinct brain functions; for example, there is proof that superior face rememberers and face-blind individuals do about as well as each other at identifying new faces, despite their vastly dissimilar abilities to remember old faces.

Completing Person Recognition Evaluations

I felt interested whether these evaluations would shed some light on why strangers look recognizable. Was I someone who constantly recalls a face? I often recognize people more than they recall me, and feel let down – a sentiment that experts say is common for superior face rememberers. But maybe I excessively identify faces – to the extent that even some new faces look known.

I was sent several facial recognition tests. I waded through them, feeling confused at times. In one, called the facial recall assessment, I had to look at black-and-white photos of a face from different viewpoints, then find it in groups. During another test that instructed me to pick out public figures from a mix of photos, many of the faces felt at least recognizable, but I couldn't exactly identify them – reminiscent to my real-life experience.

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

Comprehending False Alarm Frequencies

I also performed well in the known/unknown countenances task, which was described as notably useful for evaluating someone's recall for faces. The test-taker looks at a series of 60 monochrome photos, each of a separate face. Then they review a series of 120 analogous photos – the initial collection plus 60 unfamiliar countenances – and identify which were in the first set. The super-recognizer cutoff is roughly 80%; I remembered 78% of the faces I'd seen. On the other end of the continuum, people with prosopagnosia properly recognize an average of 57%.

I felt content with my performance, but also astonished. I recognized many of the previously seen countenances, but infrequently confused a unknown visage for one that I'd seen before. My result on this metric, called the false alarm rate, was 18%. Average identifiers, exceptional facial identifiers and face-blind individuals all have a mistaken recognition percentage of about 30% on average. So why was I misidentifying a stranger's face for my grandmother's?

Exploring Plausible Explanations

It was theorized that I possibly possessed some exceptional facial identifier capabilities. Everyone has a database of the faces we know in our recollection, but exceptional facial identifiers – and probably almost superior rememberers like me – have a comparatively extensive and high-resolution catalogue. We're also likely to distinguish countenances – that is, ascribe characteristics to each face, such as approachability or rudeness. Scientific investigation suggests that the latter helps people to learn and retain faces to enduring recollection. While distinguishing may help me remember people, it may also trick me into seeing my elderly relative in a woman who has a comparable demeanor.

In addition, it was believed I might be "a attentive countenance examiner", 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 disposed to notice the stranger who looks like my elderly relative. Indeed, one acquaintance who said she doesn't make face identification mistakes acknowledged she doesn't really look at the people around her.

Examining Over-familiarity for Faces

These assessments helped me understand where I positioned on the range. But I wanted to understand more about what is happening in the brain when we "recognize" strangers. Examining further, I read about a disorder called excessive facial recognition (HFF), in which unfamiliar faces appear known. Superficially, this sounded like it could relate to me. But the handful of documented instances all happened after a medical episode such as a seizure or brain attack, unlike the peculiarity that I've been noticing my whole grown-up existence.

Through investigative websites, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of face identification difficulties, including visual distortions, like when faces appear to be liquefying. Researchers study many of these people, using tools like the old/new faces task and the memory for faces evaluation.

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

"The occurrence rate 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 recognizable, and others, like me, who only undergo it a several occasions a month.

{Understanding