PSY 454 Lecture Notes - Lecture 4: Neocortex, Electric Potential, Electric Current
Document Summary
A flow of electrons from a body that contains a higher charge (more electrons) to a body that contains a lower charge (fewer electrons) Location to which electrons flow; lower charge. Electrical current applied to a dissected nerve induced a twitch in the muscle: concluded electricity flows along the nerve. Passing electrical current through brain tissue = charges in the electrical activity. Electrical stimulation of the neocortex causes movement (arms and legs) First to attempt to measure electrical currents of the brain using a voltmeter and electrodes on the skull. Graph that records electrical activity through the skull or from the brain and represents graded potentials of many neurons. Flow of information in the nervous system is too slow to be a flow of electricity: nerve conduction: 30-40 meters/second, electricity 3x108 meters/second. It"s (cid:374)ot the io(cid:374)s the(cid:373)sel(cid:448)es that tra(cid:448)el alo(cid:374)g the a(cid:454)o(cid:374), (cid:271)ut rather a (cid:449)a(cid:448)e of (cid:272)harge (cid:894)ber(cid:374)stei(cid:374), 1886(cid:895)
