PSB-2000 Lecture Notes - Lecture 5: Premotor Cortex, Social Cognition, Putamen
Document Summary
Overview: hierarchy of motor output, functions of association cortex, descending motor output. Both sensory input and motor output are necessary to initiate complex behaviors. Association cortex: 3 types of cortex. Association cortex: sensorimotor association cortex- gets input from sensory cortex, provides input to motor cortex includes two regions. Methods of visualizing and stimulating the living human brain: magnetic resonance imaging (mri) Consider hydrogen ions in tissue as tiny magnets. Hydrogen ions are densely concentrated in water and fat. Multiple pulses of the applied field can further discriminate tissues. Constructed from measurement of waves emitted by hydrogen atoms that have been activated within a magnetic field. High-resolution images of brain structures: functional mri (fmri) Blood oxygen level dependent (bold) signal: locate oxygenated blood based on its interference with the waves emitted by hydrogen ions: behavior research in humans. To find an area involved in simple cognitive process, need to control for unrelated neural activity.
