Respond to movements that occur in specific directions, allowing objects to be tracked in
Do not receive much information about the colour or the fine details of the object.
Sensitivity to movement and speed allows area 7 to analyze space, and update positions of
objects in space.
-Parietal regions are lesioned in monkeys; there are some striking deficits in spatial ability
impaired at computing spatial relations among objects.
-Discrimination of form (ventral stream); discrimination of spatial location (dorsal stream)
-Some cells in the parietal lobe are sensitive to the visual qualities of the object, e.g. texture, and
influence how the hands manipulate an object.
-Reciprocal connections of the parietal lobes with the frontal lobes dorsal stream for coordinating
movements with the spatial location of objects
-System of parietal cells that project to areas of the frontal lobes, to both the premotor and prefrontal
cortex. Frontal areas receive massive inputs from somatosensory, auditory, and visual association
areas of the parietal lobes.
-In frontal lobe, there are nuclei that are responsible for directing head and eye movements toward
stimuli in grasping space. These nuclei communicate with the parietal lobes, enhancing our ability to
program motor movements aimed at reaching and grasping objects in space.
-In one study, participants were asked to think about constructing 3-dimensional object.
predictable activation of the dorsal stream in the parietal lobe + activation of the dorsal premotor
cortex in the frontal lobe this task relies on short-term visuospatial memory/visuospatial working
TEMPORAL LOB ES
-Dorsal stream – to identify where an object is in space and guide motor movements; Ventral stream –
identify an object and decide what an object is (occipital to temporal lobes).
-Hippocampus appears to engage in processing memory for places, e.g. how to get to your home or
the location of your next class Damages to the hippocampal formation results in an inability to
form new memories for places. Memory formed before damaged is not affected.
-Place cells – respond in a very precise fashion, in that some cells respond only to certain locations
and other cells respond only to other locations.
E.g. when a rat is placed in an unfamiliar environment, none of the place cells responds. As the
rat becomes more familiar to the environment, a place cell will begin to respond to specific
locations within the environment.
-When we interact with the spatial locations of objects, we can utilize three types of information
about the object:
1. Position responses – made with movements using the body as a referent
Do not need any cues that are external to the body, and they are automatic
2. Cued responses – types of movements that are guided by a cue
Guide by changes in how we perceive the stimulus rely on the perception of information
that is external to the body
Compares the body with another object
3. Place responses – responses that you make toward a particular location or object
Can be made when the stimulus is not currently present, and they tend to be rational