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Throughout my mid-20s, I spotted my elderly relative through the glass of a café. I felt stunned – she had departed the previous year. I stared for a moment, then recalled it couldn't be her.

I'd encountered similar experiences throughout my life. From time to time, I "recognized" an individual I was unacquainted with. At times I could promptly determine who the unknown individual looked like – like my grandma. In other instances, a visage simply had a vague familiarity I couldn't place.

Exploring the Range of Facial Recognition Abilities

In recent times, I started wondering if different individuals have these unusual encounters. When I asked my companions, one said she frequently sees individuals in random places who look familiar. Others at times misidentify a unfamiliar individual or public figure for someone they know in everyday existence. But some reported completely different responses – they could readily identify people they'd met and people they hadn't.

I felt fascinated by this spectrum of perceptions. Was it just desire that made me see my elderly relative that day – or some kind of brain malfunction? Scientific investigation has found we spend about 14 minutes of every hour looking at faces – do we just make mistakes sometimes? I was beginning to realize that we can all see the same face but not perceive the same thing.

Grasping the Continuum of Face Identification Capacities

Investigators have developed many evaluations to measure the capacity to recall faces. There exists a wide range: at one end are exceptional facial identifiers, who remember faces they have seen only momentarily or a long time ago; at the other are people with prosopagnosia, who often find it challenging to recognize relatives, intimate companions and even themselves.

Some tests also assess how skilled someone is at determining if they have not seen a face before. This is where I believe I have limitations. But researchers "haven't thoroughly investigated this" as much as they've looked at the skill to remember a face, according to neuroscience experts. It does seem that the two abilities use separate brain mechanisms; for instance, there is indication that exceptional facial identifiers and those with facial agnosia do about as well as each other at identifying new faces, despite their extremely distinct abilities to recognize old faces.

Taking Facial Recognition Tests

I felt interested whether these assessments would provide insight on why strangers look recognizable. Was I someone who never forgets a face? I often recall people more than they remember me, and feel disappointed – a emotion that researchers say is common for super-recognizers. But maybe I over-recognize faces – to the extent that even some new faces look familiar.

I was sent several person recognition tests. I worked through them, feeling puzzled at times. In one, called the facial recall assessment, I had to look at monochrome photos of a face from three angles, then find it in arrays. During another test that told me to pick out celebrities from a mix of photos, many of the faces felt at least recognizable, but I couldn't precisely recognize them – similar to my actual experience.

I felt uncertain about my outcome. But after analysis of my results, I had properly distinguished 96% of the famous person faces. The conclusion was that I qualified as a "near-exceptional facial identifier".

Understanding False Alarm Frequencies

I also excelled in the old/new faces task, which was described as particularly good for assessing someone's recognition for faces. The test-taker looks at a collection of 60 monochrome photos, each of a different face. Then they examine a sequence of 120 similar photos – the initial collection plus 60 unknown visages – and indicate which were in the original collection. The exceptional facial identifier threshold is roughly 80%; I remembered 78% of the faces I'd seen. On the other side of the spectrum, people with facial agnosia correctly guess an average of 57%.

I felt satisfied with my result, but also taken aback. I recognized many of the familiar visages, but rarely misidentified a new face for one that I'd seen before. My performance on this indicator, called the mistaken recognition percentage, was 18%. Average identifiers, super-recognizers and face-blind individuals all have a false alarm rate of about 30% on average. So why was I mistaking a unknown person's face for my elderly relative's?

Examining Potential Reasons

It was proposed that I possibly possessed some super-recognizer capabilities. Everyone has a database of the faces we know in our recollection, but exceptional facial identifiers – and possibly almost superior rememberers like me – have a fairly substantial and detailed catalogue. We're also probably to differentiate visages – that is, ascribe qualities to each face, such as approachability or discourtesy. Research suggests that the latter helps people to develop and retain faces to long-term memory. While distinguishing may help me recall people, it may also mislead me into seeing my grandmother in a woman who has a comparable demeanor.

In furthermore, it was believed I might be "a attentive countenance examiner", meaning I pay a significant focus to faces. Others may have more incorrect identification moments, thinking they know someone they don't know. But because I tend to look attentively at faces, I am prone to notice the unknown person who similar to my elderly relative. Indeed, one acquaintance who said she doesn't make facial recognition mistakes acknowledged she doesn't really look at the people around her.

Investigating Hyperfamiliarity 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 "know" unknown people. Investigating further, I read about a condition called excessive facial recognition (HFF), in which unknown faces appear known. Superficially, this sounded like it could apply to me. But the small number of reported cases all took place after a health incident such as a epileptic episode or brain attack, unlike the peculiarity that I've been noticing my whole adult life.

Through scientific platforms, experts have heard from about 24,000 prosopagnosics, as well as people with all kinds of facial recognition challenges, including perceptual alterations, like when faces appear to be melting. Researchers study many of these people, using tools like the previously seen/unfamiliar faces task and the facial recall assessment.

Experts have heard from only a small number of people with possible HFF in extended periods of research.

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

{Understanding