Presentation on theme: "Course book Goldstein, Sensation and Perception exams two mid-terms 1½ hours multiple choice + short notes end-of-term 2-3 hours 30%, 30% and 40% (best."— Presentation transcript:
Course book Goldstein, Sensation and Perception exams two mid-terms 1½ hours multiple choice + short notes end-of-term 2-3 hours 30%, 30% and 40% (best counted as 40%) if not registered, go to office TA = Lisa Pritchett Room: 1022 Sherman Health Research Centre Office Hrs: by appointment Phone: 416-736-2100 ext 40886 Email: firstname.lastname@example.org Instructor = Prof Laurence Harris Room: 1018 Sherman Health Research Centre email: email@example.com phone:416-736-2100 ext 66108 feel free to interrupt with questions use of web page and email http://www.yorku.ca/harris/3270
Johannes Műller 1826 DOCTRINE OF SPECIFIC NERVE ENERGIES “regardless of how a receptor is stimulated it produces only one kind of sensory experience”
Figure 2.4 The neuron on the right consists of a cell body, dendrites, and an axon, or nerve fiber. The neuron on the left that receives stimuli from the environment has a receptor in place of the cell body.
1 -- electrical stimulation (artificial depolarization) 2 -- spatial and temporal integration of EPSPs and IPSPs across the neurone’s membrane resulting in the neuronal threshold being reached. Generator potential 3 -- sensory stimulation (transduction) mechanical (cytoskeleton) chemical (receptors, second messengers) light (hyperpolarization) WHEN DO CELLS PRODUCE ACTION POTENTIALS?
MODALITY labelled lines specific nerve energies INTENSITY proportional to frequency population (recruitment) DURATION rapidly adapting (RA) slowly adapting (SA) LOCATION locate a site distinguish two sites mapping Principles of Neural Coding