Chapter 10 Textbook Notes

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17 Dec 2010

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PSYB65 Textbook notesChapter 10: Spacial Ability 1
Spatial Ability: we use it to process the position, direction, or movement of objects or points in
Space is a multifaceted construct that includes both real space (what you sense right now) and
imagined space (space that you can think about even though you can't directly experience it
right now)
6 basic components:
Targeting (how well you can throw an object at a target)
Spatial orientation (how well you can recognize items when they're placed in different
orientations or directions)
Spatial location memory (how well you can remember the location of objects)
spatial visualization (how well you can imagine how well pieces of an object would go
Disembedding (how well you can find figures that are hidden within other pictures)
Spatial perception (how well you can determine where horizontal or vertical is in the real
world even if you are given distracting information).
Hemispheric Representation of Space
right hemisphere is specialized for spatial processing. However, lesions to the left hemisphere or
bilateral damage results in difficulties with spatial perception.
Depth perception: the ability to determine relative position of an object. Divided into 2 types:
Local and Global.
Local Depth Perception: is the ability to use detailed features of objects point by point to
assess relative position (tell the distance between 2 points).
Global Depth Perception: ability to use the difference between the information reaching
each eye to compute the entire visual scene.
Line Orientation : being able to differentiate between the letters d and p. The right visual field
is again, advantaged for both tactile and visual assessment of line orientation. But if the lines
can be described verbally asthe horizontal line”, then often a left hemisphere advantage
Motion detection involves activity in the right hemisphere, particularly in occipital, temporal,
and parietal areas associated with the processing of visual information.
Parietal Lobes
beyond the occipital lobes, the information is divided into 2 complementary streams
ventral visual stream : is the “what pathway useful for identifying objects
dorsal visual stream: is the “how pathway, seeing how motor acts must be performed to
manipulate an object.
Dorsal stream receives the information and sends it to area 5 and 7 of the Parietal lobe. Area
5 and 7 is responsible to generate a stable spatial map of the world (tracks moving objects
etc), which helps if we wanna pick up an object, or the differences of picking up an apple vs
picking up a jello. however, area 5 and 7 can not see color / fine definition of an object.
Ventral is to the form of the object, and Dorsal is to the spatial spatial location of the object.
Frontal Lobes
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