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In my mid-20s, I noticed my grandma through the window of a coffee shop. I felt dumbstruck – she had departed the prior year. I gazed for a moment, then recalled it couldn't possibly be her.

I'd experienced comparable occurrences all through my life. Periodically, I "recognized" an individual I was unacquainted with. Occasionally I could rapidly pinpoint who the stranger looked like – such as my elderly relative. Other times, a countenance simply had a subtle recognition I couldn't place.

Examining the Range of Person Recognition Abilities

In recent times, I started wondering if others have these odd situations. When I asked my friends, one commented she frequently sees individuals in random places who look familiar. Others occasionally misidentify a stranger or public figure for someone they know in everyday existence. But some mentioned no such experiences – they could readily identify 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 elderly relative 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 commencing to comprehend that we can all see the same face but not interpret the same thing.

Grasping the Range of Face Identification Abilities

Investigators have designed many assessments to assess the skill to recognize faces. There exists a extensive variety: at one extreme are exceptional facial identifiers, who recall faces they have seen only briefly or a long time ago; at the other are people with face blindness, who often find it challenging to recognize relatives, dear acquaintances and even themselves.

Some tests also assess how proficient someone is at recognizing if they have not seen a face before. This is where I think I fall short. But researchers "haven't thoroughly investigated this" as much as they've looked at the ability to recognize a face, according to cognitive neuroscientists. It does seem that the two abilities use distinct brain mechanisms; for instance, there is evidence that superior face rememberers and face-blind individuals do about as well as each other at identifying new faces, despite their extremely distinct abilities to recall old faces.

Undergoing Face Identification Tests

I felt curious whether these tests would offer understanding on why unknown people look known. Was I someone who constantly recalls a face? I often remember people more than they remember me, and feel disappointed – a sentiment that scientists say is common for superior face rememberers. But maybe I excessively identify faces – to the extent that even some new faces look familiar.

I received several person recognition tests. I waded through them, feeling puzzled at times. In one, called the memory for faces evaluation, I had to look at black-and-white photos of a face from three angles, then find it in arrays. During another test that directed me to pick out famous people from a mix of photos, many of the faces felt at least familiar, but I couldn't quite place them – similar to my actual experience.

I felt less than confident about my results. But after assessment of my scores, I had properly distinguished 96% of the celebrity faces. The conclusion was that I qualified as a "almost superior face rememberer".

Comprehending False Alarm Frequencies

I also excelled in the known/unknown countenances task, which was described as particularly good for measuring someone's memory for faces. The test-taker looks at a collection of 60 grayscale photos, each of a distinct face. Then they examine a series of 120 comparable photos – the initial collection plus 60 unknown visages – and specify which were in the initial group. The superior face rememberer cutoff is roughly 80%; I recognized 78% of the faces I'd seen. On the other side of the spectrum, people with prosopagnosia properly recognize an average of 57%.

I felt pleased with my performance, but also taken aback. I recognized many of the old faces, but seldom misidentified a unknown visage for one that I'd seen before. My performance on this metric, called the false alarm rate, was 18%. Average identifiers, exceptional facial identifiers and those with facial agnosia all have a false alarm rate of about 30% on average. So why was I mistaking a unknown person's face for my grandmother's?

Examining Potential Reasons

It was proposed that I probably possessed some exceptional facial identifier abilities. Everyone has a database of the faces we know in our memory, but super-recognizers – and possibly near-exceptional individuals like me – have a fairly substantial and detailed catalogue. We're also likely to distinguish countenances – that is, ascribe qualities to each face, such as amiability or discourtesy. Research suggests that the latter helps people to acquire and retain faces to long-term memory. While individuating may help me remember people, it may also deceive me into seeing my grandma in a woman who has a similar air.

In addition, it was considered I might be "an engaged facial observer", meaning I pay a lot of attention to faces. Others may have more mistaken recognition moments, thinking they know someone they don't know. But because I tend to look attentively at faces, I am disposed to notice the stranger who looks like my grandma. Indeed, one acquaintance who said she doesn't make face identification mistakes admitted she doesn't really look at the people around her.

Examining Excessive Recognition 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 "identify" unfamiliar individuals. Examining further, I read about a disorder called hyperfamiliarity for faces (HFF), in which unknown faces appear recognizable. Superficially, this sounded like it could pertain to me. But the few of reported cases all occurred after a health incident such as a seizure or cerebral accident, unlike the idiosyncrasy that I've been experiencing 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 sight abnormalities, like when faces appear to be melting. Researchers study many of these people, using tools like the known/unknown countenances task and the memory for faces evaluation.

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

"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 familiar, and others, like me, who only undergo it a multiple instances a month.

{Understanding