PSB-2000 Lecture Notes - Lecture 9: Stereognosis, Social Cognition, Acetylcholine
Document Summary
Both sensory input and motor output are necessary to initiate complex behaviors. 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 structure: functional mri (fmri) Blood oxygen level dependent (bold) signal: locate oxygenated blood based on its interference with the waves emitted by hydrogen ions: behavioral research in humans. To find area involved in simple cognitive process, need to control for unrelated neural activity. Compare pet or fmri images during several different cognitive tasks to isolate simple cognitive process. Can use subtraction to isolate signal (activity related to simple cognitive process) from noise (other activity not of interest. Association cortex: sensorimotor association cortex gets input from sensory cortex, provides input to motor cortex. Dorsolateral prefrontal association cortex: posterior parietal association cortex. Parietal lobe posterior to primary somatosensory cortex.
