Visual Perception Flashcards
1
Q
Visual Perception
A
ability to interpret and give meaning to what one is seeing
2
Q
Neurobehavioral Dysfunction
A
related to the errors people make during performance
3
Q
Perceptual Problems
A
- Apraxia
- Visual discrimination/ visual-spatial perception
- Agnosia
- Unilateral Inattention (Neglect)
4
Q
Apraxia
A
- Disorder of purposeful skilled movement that cannot be attributed to sensorimotor dysfunction. - This is not visual perceptual problem but a neurobehavioral dysfunction that can present similarly to perceptual deficits
- think old people post strokes not kids
5
Q
Ideational Apraxia
A
- Ideational apraxia
- left frontal lobe or L MCA stroke
- Loss ability to conceptualize, plan and execute motor actions
- Involved in use of tools or objects
- Client doesn’t appear to know what to do with ADL items presented for task
- Client doesn’t demonstrate appropriate use of ADL items
- Client utilizes body parts in place of tools during ADL tasks (e.g. comb hair with fingers when comb/brush available)
6
Q
Ideo-Motor Apraxia
A
- R/L frontal lobe – MCA
- Loss of access to kinesthetic memory so that purposeful movement cannot be produced, even though the idea is understood
- Uses clumsy inflexible movements that lack goal directed sequencing to hold ADL items
- Unable to change position of an ADL item in order to reorient it and cross the body’s midline, has difficulty gesturing the correct use of a familiar object after verbal command, in absence of object
- If you provide visual input and people are able to use these strategies, it is not a motor apraxia
7
Q
Visual discrimination/visual-spatial perception
A
- R Parietal Lobe Damage
- awareness of the distinctive features of forms, including shape, orientation, size and color
- Figure-ground
- Form constancy
- spatial relations
- topographical disorientation
- depth perception (stereopsis)
- visual closure
8
Q
Figure-Ground
A
- problems differentiating foreground from background.
- Ex: unable to locate scissors in cluttered drawer
- Ex: difficulty locating clothing on same colored sheets
9
Q
Form Constancy
A
- ability to distinguish different types of forms in the environment, despite different size, shape, orientation, etc
10
Q
Spatial Relation
A
- difficulty perceiving self or objects in relation to other objects with concepts such as up/down/, in/out, over/under, on/off.
- E.g. wearing pants inside out, or difficulty putting a jigsaw puzzle together.
11
Q
Topographical Disorientation
A
- inability to find one’s way from one place to another.
- Ex: unable to master navigation of an unfamiliar unit, wandering, ending in the wrong room
12
Q
Depth Perception (Stereopsis)
A
- inability to judge depths and distances.
- E.g. misjudging distance when placing toothbrush under running water or unable to determine how and when to step off escalator
13
Q
Visual Closure
A
- inability to determine what the image is without having all of the details present.
- E.g. cannot determine what leftovers are in the back of the fridge
14
Q
Agnosia
A
- R parietal lobe damage
- impaired ability to recognize the significance and/or differentiate between sensory stimuli
- inability to recognize objects, faces, limitations etc., despite intact cognition, language skills and visual acuity or field
- multiple forms - do not have more than one at a time usually
15
Q
Auditory Agnosia
A
- unable to differentiate sounds
- Nothing to do with hearing, just the perception of the auditory processing
- Can’t differentiate between voices
