Chap 14

Question 1

The parietal cortex processes 3 things:

Answer 1

somatosensory, visual and spatial information

Question 2

What are the 3 functional zones of the parietal lobes ?

Answer 2

1. Anterior
2. Superior
3. Inferior

Question 3

What is zone 1 responsible for ?

Answer 3

• the anterior zone is for somatosensory functions and perceptions

Question 4

What is zone 2 responsible for ?

Answer 4

• the superior zone is for visually guided movements
• in humans it is for mental manipulation of objects

Question 5

What is zone 3 responsible for ?

Answer 5

• the inferior zone is for spatial cognition and arithmetic tasks and reading

Question 6

What are 2 parietal lobe asymmetries ?

Answer 6

1. Area PG is larger on the left in humans vs monkeys
2. Area PG is larger on the right versus the left

Question 7

What is the role of area PE (5) ?

Answer 7

it is the “how” area
responsible for guided movements and limb location

Question 8

What is the role of area PF (7) ?

Answer 8

Elaborates on information for motor processes

Question 9

What is the role of area PG ?

Answer 9

seems to control spatially guided behaviors in respect to visual and tactile information

Question 10

how do posterior parietal neurons accommodate movement ?

Answer 10

1. they are active when they receive sensory, motivational and other motor inputs
2. They are also active when the animal attends to the target

Question 11

What are sensorimotor calculations ?

Answer 11

the calculations that need to be made as our body continuously moves in space and time

Question 12

What are the 2 uses of spatial information ?

Answer 12

1. Object-centered systems (allocentric)
2. Viewer-centered systems (egocentric)

Question 13

Describe attention processes of the parietal cortex

Answer 13

1. The dorsal parietal cortex is responsible for top-down processes
2. the ventral parietal cortex is responsible for bottom-up processes

Question 14

What is and what causes hemi innattention ?

Answer 14

Damage to the right TPJ causes heme-inattention
- hemi-inattention is the failure to respond to and report on stimuli

Question 15

What is the role of LIP neurons ?

Answer 15

These neurons process sensory and cognitive information to make a “priority map” that tell us the relevancy of behaviors in relation to stimuli at a time and place

Question 16

What is afferent paresis ?

Answer 16

The loss of sensory feedback from post-central gyrus damage

Question 17

What is astereognosis ?

Answer 17

Inability to recognize objects by touch alone

Question 18

What is simultaneous extinction ?

Answer 18

When two stimuli are presented at the same time, it is the failure to report one of the individual stimuli

Question 19

What is blind touch ?

Answer 19

Failure to report the touch of something but can identify where they were touched

Question 20

What is Balint syndrome ?

Answer 20

Combination of simultaneous extinction and optic ataxia
- difficulty distinguishing between two stimuli while also making visually guided movements

Question 21

What is apraxia ?

Answer 21

Disorder of purposeful movement not caused by weakness, muscle issues, tremors etc.

Question 22

What are constructional disorders ?

Answer 22

Severe impairment of spatial abilities

Question 23

What do drawing tests suggest about right vs left parietal hemisphere damage ?

Answer 23

right hemisphere damage = omitting details to the left side of their drawings
Left hemisphere damage= omitting lines and less recognizable drawings