Agnosia Flashcards
agnosia in greek
a- = without, -gnos-=knowledge, -ia=condition
types of agnosia
apperceptive visual agnosia, associative visual agnosia and prosopagnosia
agnosia
a brain disordder involving the inability to recognise familiar stimuli through the use of one or more sense, despite the senses functioning normally otherwise
what commonly causes visual agnosia and why
brain leisons that occur in the parietal lobe, temporal lobe and occipital love as these areas of the brain are associated with processing visual information
apperceptive visual agnosia
the inability to recognise familiar visual stimuli due to problems with processing perceptions (can’t percieve or recognise stimuli)
stymptoms of apperceptive visual agnosia
difficulty recognising objects by sight (rely on other senses), problems copying or drawing objects, inability to distinguish shapes and patterns
what causes apperceptive visual agnosia
caused by brain injury (e.g physical injury, dementia, stroke and other degenerative brain diseases) particurally in the parietal and occipital lobees
dinner plate example for apperceptive visual agnosia
not able to recognise it as ‘a dinner plate,’ if you asked them what a dinner plate was they could describe it to you, but if you showed them a picture of one they could not tell you what it is. if you asked them to get a dinner plate they would use their sense of touch to identify the item (using shape and texture)
associative visual agnosia
the condition where individuals can percieve and desrcibe visual stimuli but cannot associate them with their meaning
symptoms of associative visual agnosia
ability to copy or draw objects accuratley, ability to describe the shape, colour and structure of an object but cannot identify it, difficulty recognising familiar objects
causes of associative agnosia
leisons in the temporal lobe
example of associative visual agnosia dinner plate
could tell you what a dinner plate is and might use their other senses to locate a dinner plate. could copy drawing of dinner plate, but could not name what they have just drawn
prospagnosia
the inability to recognise the faces of familiar people despite having no memory dysfunction, memory loss or impaired visual sensation
symptoms of prospagnosia
cannot percieve facial expressioons so rely on other cues such as hair and clothing to identify people
what diseases is prosopagnosia associated with
autism spectrum disorder, can occur in alzheimers disease
