3.17
Prosopagnosie
Prosopagnosie, auch Gesichtsblindheit genannt, ist die Unfähigkeit, Gesichter zu erkennen. In schweren Fällen erkennen Personen mit Prosopagnosie enge…
Prosopagnosie, auch Gesichtsblindheit genannt, ist die Unfähigkeit, Gesichter zu erkennen.
In schweren Fällen kann es vorkommen, dass Personen mit Prosopagnosie enge Familienmitglieder, einschließlich Eltern und Ehepartner, nicht an ihren Gesichtern erkennen.
Prosopagnosie beeinträchtigt spezifisch die Gesichtserkennung, während die Erkennung anderer Objekte oder Reize davon unberührt bleibt.
Infolgedessen sind Personen mit Prosopagnosie auf nicht-gesichtsbezogene Hinweise angewiesen, wie z. B. einzigartige Hautmuster, Körperform und -größe, bestimmte Brillenstile oder -farben und bevorzugte Kleidungsstile, um vertraute Personen zu identifizieren.
Prosopagnosie kann von Geburt an vorhanden sein oder durch Hirnverletzungen, Schlaganfälle oder neurologische Erkrankungen erworben werden.
Entwicklungsprosopagnosie stört die neuronale Kommunikation und behindert die Gesichtsverarbeitung vom Säuglingsalter über die frühe Kindheit bis zum Erwachsenenalter.
Studien zeigen, dass der Gyrus fusiformis im Schläfenlappen entscheidend für die Gesichtserkennung ist. Eine Schädigung dieses Bereichs kann zu Prosopagnosie führen.
Dieser Zustand zeigt auch die Grenzen der Plastizität des Gehirns, da Beeinträchtigungen der Gesichtserkennung trotz wiederholter Exposition gegenüber vertrauten Gesichtern ein Leben lang bestehen bleiben.
View the full transcript and gain access to JoVE Core videos
Q1: What is prosopagnosia and how does it affect facial recognition?
Prosopagnosia, also known as face blindness, is the inability to recognize faces. This condition specifically impairs facial recognition while leaving the recognition of other objects unaffected. In severe cases, individuals may not recognize close family members, including parents and spouses, by their faces alone.
Q2: How do people with prosopagnosia identify familiar individuals?
People with prosopagnosia rely on non-facial cues to identify familiar people. These include unique skin patterns, body shape and size, specific styles or colors of eyeglasses, and preferred clothing styles. For example, someone might recognize a coworker by their unusual haircut and colorful glasses frames rather than their face.
Q3: What are the two main types of prosopagnosia?
Prosopagnosia can be developmental or acquired. Developmental prosopagnosia is present from birth and disrupts neural communication from infancy through adulthood. Acquired prosopagnosia develops through brain injury, stroke, or neurological disease, causing sudden loss of facial recognition abilities in previously unaffected individuals.
Q4: Which brain region is responsible for facial recognition?
The fusiform gyrus in the temporal lobe is crucial for facial recognition. Damage to this area can cause prosopagnosia. For instance, someone who suffers a stroke damaging the fusiform gyrus may suddenly become unable to recognize even their own reflection in the mirror.
Q5: What role does neural communication play in developmental prosopagnosia?
Developmental prosopagnosia is characterized by inadequate connections and reduced white matter fibers linking brain regions responsible for facial recognition. This disrupted neural communication hinders face processing from infancy through adulthood, preventing normal development of facial recognition abilities despite repeated exposure to familiar faces.
Q6: Why does prosopagnosia demonstrate limitations of brain plasticity?
Prosopagnosia shows brain plasticity limitations because facial recognition impairments persist throughout life despite repeated exposure to familiar faces. The brain cannot compensate for or rewire damaged facial recognition systems, even with consistent practice and familiarity with specific individuals over many years.
Q7: How does prosopagnosia differ from other perceptual disorders?
Prosopagnosia specifically impairs facial recognition while leaving other object recognition intact. Unlike visual agnosia, which affects general object recognition, prosopagnosia isolates facial processing deficits. Individuals retain normal perception of colors, shapes, and spatial relationships while struggling exclusively with face identification.