1. Behaviourism vs
Cognitive science
Single cells
Correlate with higher processes such as attention
Clinical – cognitive deficits
Imaging – PET, fMRI, MEG, voltage sensitive dyes, deoxyglucose
Computer science, modeling, networks (+ psychophysics)
Personal space
Peri-personal space
Extra-personal space
Remembered space

2. TYPES OF CODING
“labeled lines”

3. SA RA SA RA

4. fine detail
hand grip control
stretching
vibration

5. MERKEL (SA)
PACINIAN (vRA)

6. VENTRAL POSTERIOR LATERAL Nucleus of the thalamus
SOMATOSENSORY CORTEX
4th
Trigeminal
system from
face
3rd
VENTRAL POSTERIOR LATERAL
Nucleus of the thalamus
2nd
CROSS OVER
IN BRAIN STEM
DORSAL COLUMNS
1st
Somatosensory
pathway

7. Secondary Somatosensory cortex Secondary Somatosensory cortex
Multiple representations
3a -- muscle spindles
3b -- SA (cutaneous)
RA (cutaneous)
joints
Secondary
Somatosensory cortex

8. cutaneous mechanoreceptors
Muscle spindles
Joint receptors
LIMB SENSING ORGANS
Muscle spindles, cutaneous mechanoreceptors and joint receptors

11. MONOSYNAPTIC STRETCH REFLEX ARC

13. WILDER PENFIELD
( )
In 1913

14. WILDER PENFIELD
McGIll
( )

21. RECEPTIVE FIELDS ON THE ARM

22. Area of somatosensory cortex representing finger tip
stimulate finger tip over many days
Larger area now devoted to this finger tip
DEMONSTRATES
PLASTICITY

24. Demonstrates: 1 plasticity,
2 Müller’s law of specific nerve energies

26. LESIONS in the parietal cortex lead to AGNOSIAs

32. Lesions to the right produce lack of awareness of the object’s left
Lesions to the left produce little lack of awareness because BOTH sides are represented in the right

33. LOCAL = D vs
GLOBAL = L
Frontal
Parietal v3 v3 v2

34. EFFECT OF ATTENTION
vision….
+ planning to look at it
+ planning to reach to it

35. PARIETAL activated by:
Locations (external space)
Locations are updated after saccades (remembered space)
Shifts of attention

36. Duhamel JR, Colby CL, Goldberg ME
Duhamel JR, Colby CL, Goldberg ME. The updating of the representation of visual space in parietal cortex by intended eye movements. Science (80- ) 1992; 255: 90–92.

37. Visual response to a stimulus in the RF
Responds to new location (in space) i.e., a different part of the retina (RF moved!) ….
… starts BEFORE saccade.