Motor control and object recognition
Overview
Motor control
Basic questions regarding motor control can nowadays be answered
PPT Slide
`Correspondence views' on brain structures
Cortical anatomy of the motor system: lateral view
Medial view
Simple movement activations motor cortex and somatosensory cortex
More complicated sequences involve other areas
Imagined movements remain limited to the supplementary motor area (SMA)
Internally and externally generated movements
Skilled (Old) versus new motor movements
Spinal cord
Cats with severed spinal cord could still walk on a treadmill
Muscles are activated by alpha motor neurons
The stretch reflex reveals some elementary processing in the spinal cord
Global anatomy of cerebellum
More detailed anatomy of cerebellum
Louis Bolk: midline cerebellar vernis controls bilaterally synchronized movements; cerebellar hemispheres control unilateral movements
Computational views on cerebellum
Basal ganglia
Summary of the architecture of the motor system
How these structures may contribute to our actions
Activation of motor areas is a cascade rather than a sequence
Object recognition
What and where pathways from the occipital cortex
Where stream
Neuron in posterior parietal cortex
What stream
Desimone's study of V4* neurons
A neuron in inferior temporal cortex (IT)
What is known about what is located in the brain?
PET data corroborate the lesion data
Warrington's two-stage model of object recognition
Warrington's Unusual Views and Shadows Tests for apperceptive agnosia
Right hemisphere lesion Unusual Views Test
Right hemisphere lesion (cont'd) Shadows Test
Associative agnosia: semantic categorization is impaired
Summing up the what and where
Email: jaap@murre.com
Home Page: http://www.neuromod.org/courses/public.html
Other information: neuroMod: Home of the Neural and Cognitive Modeling Group at the University of Amsterdam.
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