SIMPLE PERCEPTUAL DISORDERS (COLOUR PERCEPTION DISTURBANCES (Achromatopsia…
SIMPLE PERCEPTUAL DISORDERS
Visual object: visual association cortex
Inability to recognise objects using vision although visual system is intact
COLOUR PERCEPTION DISTURBANCES
All colours appear less bright and it is difficult to match or sort colours or shades of colour
Inability to recognise faces (with intact sensory abilities)- often seen with visual object agnosia
Unable to associate common objects with colours- but can match colours
Difficulty recognising the meaning of a total array of pictures
Acquired inability to recognise written word
DISORDERS OF RECOGNITION/BODY SCHEME
Denial of paresis or extremity; or unawareness/lack of insight
Difficulty recognising body parts or their relation to each other
Inability to distinguish between sounds or to recognise familiar sounds
Inability to recognise objects just using touch even though sensory abilities are intact
Sensory association areas (secondary areas): lesions impair the ability to interpret incoming sensory information to add meaning simple and perceptual disorders e.g. agnosia’s
Tertiary areas: between the different secondary association areas and multimodal association areas (the area around the superior temporal sulcus and in the prefrontal region). Lesions cause complex perceptual disorders e.g. spatial relations disorders.
Primary sensory areas: lesions cause sensory deficits
An inability to recognise or make sense of incoming sensory information even though sensory capacities are intact.
Affect any modality – vision, audition, touch, taste and anything- faces, sounds, colours, objects.
Often classified according to the sensory modality affected.