PSYB65 Chapter 10
What is spatial ability:
- spatial orientation
- spatial location memory
- spatial visualization
- spatial perception
Hemispheric representaiton of space
- Based on Hughlings-Jackson’s paper in 1874, its believed language
is on left and spatial is on the right
- Normal people can identify the location of a dot in space when it’s
in left visual field. Therefore projected to right hemisphere
- Right hemisphere involved with the recall of spatial location
- Depth perception
o Local depth perception - use detailed features of objects
point by point to assess relative position
o Global depth perception – use difference between
information reaching each eye to compute entire visual
- Right hemisphere better at determining global depth perception.
- Local depth perceiton is disrupted when both right and left
hemsiphere is lesioned.
- Line orientation: right hemisphere advantage for tactile and visual
assessment of line orientation
- if line orientation is describved verbally, then left hemisphere is
- often ask measures more than one ability when it’s meant to only
- right hemisphere also superior in recognizing whether a novel
figure had been previously viewed
- detection of motion = increased activity in right hemisphere,
particularly ocipital, temporal and parietal areas that process
- mental rotation: rotation that is not overt. Have to imagine it in
your had. Eg. Task to look at 2 items and decide if they’re same
o Found that this relies on right hemisphere
- visual information goes through
o ventral visual stream: what pathway. Identifying objects
o dorsal visual stream: how pathway. How should motor acts perform to manipulate an object
dorsal stream suports spatial processing of infmration.
Projects from primary visual to parietal regions
- parietal areas 5 and 7 – responds to movements and occur in
specific directions, allowing objects to be tracked in space.
Responds best to movements that are similar in speed to walking
o sensitive to retinotopic representstionas of space as well as
head position, movement, and speed of movement
- when lesioned, monkeys can’t learn to pick up item only if it’s
close to another object. Similar in humans.
- Discrimination of form involves ventral stresam
- Spatial location involves dorsal stream.
- Greater activation in right parietal lobes when participants were
asked to perform tasks requiring spatial location
- consists of premotor an dprefrontal cortex
- provides coordinate system of visual space and to locat eobjhects
- parietal cortex projects to frontal motor system to guide
movements in space
- nuclei in frontal lobes directs head and eyes toward simuli in
- imagining construction of a 3D object involves actiavtion of dorsal
prmotor cortex and dorsal stream in parietal lobe.
- Patients with dorsolateral prefrontal lesions most impaired when
visuospatial working memory required to guide motor repsonse
- Performanc eof visuospatial working memory tasks engages dorsal
stream along with its ocnnections to frontal lobe
- dorsal stream identifyies where object is in space
- evidence ventral stream identifies what the object is
- spatial localization of objects increases activity in temporal lobes
- temporal lobes, hippocampual formation also involved with spatial
o includes dentate gyrus, hippocampus and subciculum.
- Hippocampus engage in processing memory for places.
- Rats with hippocampal lesions can’t remember important
- Place cells – some cells presond to certain locations and other
repsond only to other locations.
- 3 types of information about object
o position repsonses – movements using the body. Only
requires information about your body. o cued responses – types of movements guided by a cue.
Changes in how we perceive stimulus. Rely on perception of
information that is external to body. Compare your body
with another object
o place responses – responses toward location or object.
Made even when stimulus not present. It’s also relational.
- Intrapersonal space: space around your body, icndluing your
- Extrapersonal space: space more than 5ft away from you.
Personal representations of space
- Acredolo test: seated in a chair. Blindfolded, and desks and
chairs are moved across the room. when blindfold removed asked
to return to original position.
- using acredolo test, participant makes cued repsonse to walk
toward desk and chain (but it’s been moved so they’d be wrong).
- Making a place repsonse, ask them to position desk with respect
to position of the door and window (not moved). Person making
place response shohld be able to notice movement of desk and
return to correct original position
- Other studies use mazes, most common – water maze. Have to
find hidden platform. Unlesioned rats can learn task of finding
platform easily. Rats with hippocampal lesions do not learn where
hidden playform is
o If platform placed above water, then maze would rely on
cued response and both lesioned or unlesioned
hippocampus rats can solve it
- Taxi drivers imaginged navigation = enhacned activity in right
hippocampus. Longer taxi driving experience = larger
- Dead reckoning: place response, rats demonstraite that they
know how to take short cuts back to their cage.
- Rats with lesions to fornix, dierupts funcitoning of hippomcapus
don’t use dead reckoning. They follow path they used to get to
their food (follow string/cued