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Throughout my young adulthood, I observed my grandmother through the pane of a coffee shop. I felt dumbstruck – she had passed away the prior year. I gazed for a moment, then reminded myself it couldn't be her.

I'd experienced comparable experiences throughout my life. Occasionally, I "recognized" an individual I didn't know. Sometimes I could quickly pinpoint who the stranger reminded me of – such as my elderly relative. On other occasions, a countenance simply had a subtle recognition I couldn't recognize.

Exploring the Spectrum of Face Identification Abilities

In recent times, I began questioning if others have these unusual experiences. When I inquired my acquaintances, one said she often sees individuals in unexpected places who look recognizable. Others at times mistake a stranger or celebrity for someone they know in everyday existence. But some reported completely different responses – they could easily recognize people they'd met and people they hadn't.

I felt curious by this diversity of responses. Was it just longing that made me see my grandmother that day – or some kind of cognitive error? Scientific investigation has found we spend about a quarter-hour 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 Range of Facial Recognition Capacities

Researchers have developed many assessments to measure the skill to recognize faces. There exists a extensive variety: at one extreme are superior face rememberers, who remember faces they have seen only briefly or a distant past; at the other are people with prosopagnosia, who often find it challenging to know family, close friends and even themselves.

Some assessments also assess how skilled someone is at telling if they have not seen a face before. This is where I think I have limitations. But scientists "haven't extensively researched this" as much as they've looked at the capacity to remember a face, according to brain researchers. It does seem that the two skills use distinct brain functions; for example, there is proof that superior face rememberers and those with facial agnosia do about as well as each other at discerning new faces, despite their vastly dissimilar abilities to recall old faces.

Taking Facial Recognition Tests

I felt intrigued whether these tests would shed some light on why unfamiliar individuals look recognizable. Was I someone who always remembers a face? I often recall people more than they remember me, and feel disappointed – a emotion that scientists say is frequent for superior face rememberers. But maybe I over-recognize faces – to the extent that even some new faces look known.

I received several face identification tests. I completed them, feeling confused at times. In one, called the Cambridge Face Memory Test, 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 public figures from a mix of photos, many of the faces felt at least known, but I couldn't exactly identify them – similar to my everyday experience.

I felt uncertain about my results. But after evaluation of my scores, I had accurately recognized 96% of the celebrity faces. The finding was that I qualified as a "almost superior face rememberer".

Grasping Mistaken Recognition Percentages

I also performed well in the old/new faces task, which was described as particularly good for assessing someone's memory for faces. The test-taker looks at a sequence of 60 monochrome photos, each of a distinct face. Then they review a sequence of 120 comparable photos – the original series plus 60 new faces – and identify which were in the initial group. The exceptional facial identifier cutoff is roughly 80%; I recognized 78% of the faces I'd seen. On the other end of the continuum, people with facial agnosia properly recognize an average of 57%.

I felt satisfied with my score, but also surprised. I recognized many of the previously seen countenances, but seldom mistook a unknown visage for one that I'd seen before. My score on this metric, called the incorrect identification frequency, was 18%. Typical rememberers, super-recognizers and prosopagnosics all have a mistaken recognition percentage of about 30% on average. So why was I mistaking a stranger's face for my grandmother's?

Exploring Potential Causes

It was theorized that I likely possessed some super-recognizer abilities. Everyone has a database of the faces we know in our memory, but exceptional facial identifiers – and likely almost superior rememberers like me – have a relatively large and high-resolution catalogue. We're also possibly 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 enduring recollection. While differentiating may help me recall people, it may also trick me into seeing my grandma in a woman who has a analogous presence.

In moreover, it was considered I might be "a attentive countenance examiner", meaning I pay a considerable notice to faces. Others may have more incorrect identification moments, thinking they identify someone they don't know. But because I tend to look carefully at faces, I am inclined to notice the unknown person who similar to 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.

Investigating Excessive Recognition for Faces

These evaluations helped me understand where I stood on the continuum. But I wanted to understand more about what is happening in the brain when we "recognize" unfamiliar individuals. Investigating further, I read about a condition called excessive facial recognition (HFF), in which unrecognized faces appear familiar. On the surface, this sounded like it could pertain to me. But the small number of documented instances all occurred after a physical event such as a seizure or stroke, unlike the idiosyncrasy that I've been observing my whole adult life.

Through research sites, experts have heard from about 24,000 those with facial agnosia, as well as people with all kinds of facial recognition challenges, including visual distortions, like when faces appear to be dissolving. Researchers study many of these people, using instruments 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 many years of study.

"The frequency is quite low," one expert said of HFF. However, they theorized that there may be a continuum, with some people who think every face is familiar, and others, like me, who only undergo it a few times a month.

{Understanding