PSYC 220 Lecture Notes - Lecture 1: Positron, Radio Frequency, Distributed Computing
Document Summary
Study question: describe 4 different methods for investigating cognitive functioning in the brain. Blind sight example: brain lesions resulting from disease/trauma, primary visual cortex is damaged; see a big black hole in the middle of your vision (called a scatoma), peripheral vision still works, ex. Weiskrantz (1986) case study: (cid:498)graham(cid:499) it is or what way it moved: deliberate, surgical destruction of brain tissue, ex. Single cell recording (looked at previously with neurons: ex. Hubel & wiesel (experiment using cats: in human participants (steve carell neurons) Magnetic resonance imaging (mri: provides better contrast between soft tissues that ct, doesn"t need ionizing radiation (contrast agent, giant magnet realigns water molecules, radio frequency electromagnetic field is present. Returns to original alignment when em is turned off. Scanner detects signals given off during alignment. Indirect measures-were looking as what part of the brain blood flows to after a delay: hemodynamic delay (blood change in delays) In pet delays up to 60 seconds.