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During my young adulthood, I noticed my grandma through the window of a coffee house. I felt stunned – she had departed the year before. I gazed for a brief period, then reminded myself it couldn't be her.

I'd had analogous situations throughout my life. From time to time, I "recognized" an individual I didn't know. Sometimes I could rapidly determine who the unknown individual looked like – such as my elderly relative. In other instances, a visage simply had a subtle recognition I couldn't place.

Investigating the Spectrum of Facial Recognition Capabilities

In recent times, I started wondering if other people have these odd experiences. When I questioned my acquaintances, one mentioned she often sees persons in unpredictable places who look recognizable. Others at times mistake a stranger or celebrity for someone they know in everyday existence. But some mentioned completely different responses – they could readily distinguish people they'd met and people they hadn't.

I felt curious by this spectrum of experiences. Was it just longing that made me see my elderly relative that day – or some kind of cognitive error? Studies has found we spend about approximately 900 seconds of every hour looking at faces – do we just err sometimes? I was starting to understand that we can all see the same face but not experience the same thing.

Comprehending the Continuum of Person Recognition Capacities

Scientists have designed many evaluations to quantify the skill to recall faces. There exists a broad spectrum: at one side are super-recognizers, who recognize faces they have seen only for a short time or a considerable time past; at the other are people with prosopagnosia, who often struggle to recognize kin, close friends and even themselves.

Some assessments also measure how skilled someone is at recognizing if they have not seen a face before. This is where I think I fall short. But experts "just haven't dug into this" as much as they've examined the ability to recognize a face, according to neuroscience experts. It does seem that the two capabilities use distinct brain mechanisms; for instance, there is indication that exceptional facial identifiers and prosopagnosics do about as well as each other at discerning new faces, despite their wildly different abilities to recognize old faces.

Completing Facial Recognition Tests

I felt intrigued whether these evaluations would provide insight on why unfamiliar individuals look known. Was I someone who always remembers a face? I often recognize people more than they recall me, and feel disheartened – a emotion that experts say is typical for exceptional facial identifiers. But maybe I excessively identify faces – to the degree that even some new faces look recognizable.

I received several person recognition tests. I worked through them, feeling puzzled 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 arrays. During another test that instructed me to pick out celebrities from a mix of photos, many of the faces felt at least familiar, but I couldn't exactly identify them – similar to my actual experience.

I felt doubtful about my performance. But after analysis of my results, I had properly distinguished 96% of the famous person faces. The conclusion was that I qualified as a "almost superior face rememberer".

Understanding Mistaken Recognition Frequencies

I also did exceptionally in the known/unknown countenances task, which was described as notably useful for assessing someone's recall for faces. The subject looks at a sequence of 60 grayscale photos, each of a separate face. Then they look through a sequence of 120 analogous photos – the first group plus 60 unknown visages – and specify 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 extreme of the spectrum, people with facial agnosia properly recognize an average of 57%.

I felt pleased with my result, but also astonished. I recalled many of the previously seen countenances, but seldom mistook a unfamiliar countenance for one that I'd seen before. My result on this measure, called the mistaken recognition percentage, was 18%. Average identifiers, exceptional facial identifiers and those with facial agnosia all have a incorrect identification frequency of about 30% on average. So why was I misidentifying a stranger's face for my grandma's?

Exploring Possible Causes

It was proposed that I probably possessed some exceptional facial identifier abilities. Everyone has a inventory of the faces we know in our recollection, but super-recognizers – and likely borderline straddlers like me – have a comparatively extensive and precise catalogue. We're also possibly to distinguish countenances – that is, ascribe characteristics to each face, such as friendliness or impoliteness. Scientific investigation suggests that the latter helps people to develop and retain faces to permanent recall. While individuating may help me remember people, it may also trick me into seeing my grandmother in a woman who has a comparable demeanor.

In moreover, it was considered 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 closely at faces, I am disposed to notice the stranger who resembles my elderly relative. Indeed, one companion who said she doesn't make facial recognition mistakes acknowledged she doesn't really look at the people around her.

Examining Hyperfamiliarity for Faces

These assessments 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 disorder called hyperfamiliarity for faces (HFF), in which unknown faces appear known. Initially, this sounded like it could pertain to me. But the few of recorded occurrences all happened after a medical episode such as a epileptic episode or cerebral accident, unlike the idiosyncrasy 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 person recognition difficulties, including visual distortions, like when faces appear to be dissolving. Researchers study many of these people, using methods like the known/unknown countenances task and the memory for faces evaluation.

Experts have heard from only a few of people with suspected HFF in extended periods of investigation.

"The prevalence 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 known, and others, like me, who only experience it a several occasions a month.

{Understanding