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During my mid-20s, I observed my grandmother through the pane of a café. I felt dumbstruck – she had passed away the year before. I gazed for a short time, then reminded myself it couldn't possibly be her.

I'd encountered comparable situations all through my life. Periodically, I "knew" someone I didn't know. Sometimes I could quickly identify who the unfamiliar person looked like – for instance my grandma. Other times, a visage simply had a vague familiarity I couldn't identify.

Examining the Variety of Person Recognition Experiences

In recent times, I became curious if other people have these unusual situations. When I asked my companions, one mentioned she regularly sees people in unexpected places who look known. Others at times misidentify a stranger or celebrity for someone they know in real life. But some described completely different responses – they could easily distinguish people they'd met and people they hadn't.

I felt curious by this range of perceptions. Was it just longing that made me see my grandmother 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 err sometimes? I was commencing to comprehend that we can all see the same face but not interpret the same thing.

Grasping the Spectrum of Facial Recognition Skills

Investigators have designed many tests to measure the capacity to recall faces. There exists a wide range: at one extreme are super-recognizers, who remember faces they have seen only for a short time or a long time ago; at the other are people with facial agnosia, who often find it challenging to know relatives, dear acquaintances and even themselves.

Some tests also capture how good someone is at determining if they have not seen a face before. This is where I think I am deficient. But researchers "just haven't dug into this" as much as they've studied the skill to remember a face, according to cognitive neuroscientists. It does seem that the two abilities use different brain mechanisms; for example, there is proof that exceptional facial identifiers and those with facial agnosia do about as well as each other at discerning new faces, despite their extremely distinct abilities to recall old faces.

Taking Person Recognition Assessments

I felt intrigued whether these evaluations would offer understanding on why unfamiliar individuals look familiar. Was I someone who constantly recalls a face? I often recall people more than they recognize me, and feel disappointed – a emotion that experts say is common for exceptional facial identifiers. But maybe I excessively identify faces – to the extent that even some new faces look familiar.

I was sent several facial recognition tests. I waded through them, feeling puzzled at times. In one, called the Cambridge Face Memory Test, I had to look at grayscale photos of a face from multiple perspectives, then find it in lineups. During another test that directed me to pick out famous people from a mix of photos, many of the faces felt at least known, but I couldn't precisely recognize them – similar to my everyday experience.

I felt less than confident about my results. But after evaluation of my scores, I had properly distinguished 96% of the famous person faces. The finding was that I qualified as a "near-exceptional facial identifier".

Grasping Mistaken Recognition Percentages

I also excelled in the known/unknown countenances task, which was described as notably useful for measuring someone's memory for faces. The test-taker looks at a collection of 60 monochrome photos, each of a separate face. Then they review a sequence of 120 analogous photos – the original series plus 60 unknown visages – and identify which were in the original collection. The superior face rememberer threshold is roughly 80%; I recalled 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 pleased with my performance, but also astonished. I remembered many of the old faces, but rarely mistook a unknown visage for one that I'd seen before. My performance on this indicator, called the false alarm rate, was 18%. Typical rememberers, super-recognizers and prosopagnosics all have a incorrect identification frequency of about 30% on average. So why was I misidentifying a stranger's face for my grandmother's?

Exploring Plausible Causes

It was proposed that I probably possessed some exceptional facial identifier capacities. Everyone has a database of the faces we know in our memory, but super-recognizers – and probably almost superior rememberers like me – have a fairly substantial and detailed catalogue. We're also possibly to distinguish countenances – that is, ascribe characteristics to each face, such as amiability or rudeness. Research suggests that the second aspect helps people to develop and retain faces to permanent recall. While distinguishing may help me recognize people, it may also deceive me into seeing my grandma in a woman who has a comparable demeanor.

In moreover, it was thought I might be "an active face perceiver", meaning I pay a considerable notice to faces. Others may have more false alarm moments, thinking they know 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 elderly relative. Indeed, one companion who said she doesn't make person recognition mistakes acknowledged she doesn't really look at the people around her.

Investigating Over-familiarity for Faces

These assessments 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. Examining further, I read about a condition called excessive facial recognition (HFF), in which unrecognized faces appear recognizable. On the surface, this sounded like it could pertain to me. But the handful of reported cases all took place after a medical episode such as a convulsion or brain attack, unlike the quirk that I've been noticing my whole grown-up existence.

Through scientific platforms, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of person recognition challenges, including perceptual alterations, like when faces appear to be melting. Researchers study many of these people, using methods like the previously seen/unfamiliar 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 prevalence is quite low," one expert said of HFF. However, they hypothesized that there may be a range, with some people who think each countenance is known, and others, like me, who only undergo it a multiple instances a month.

{Understanding