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Lec6BNeurons

# Lec6BNeurons - Lecture 6 How neurons work how drugs work...

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Lecture 6 (2/5/09): How neurons work, how drugs work Nerve conductance and some questions regarding jealousy and alcohol readings How neurons work: Action and resting potentials and inter-neuron communication How drugs work (if time)….

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In Class Nerve Velocity Data Trials 3rd to Last 2nd to Last Last Duration (Seconds) 3.6 3.8 4.0 4.2 4.4 4.6 4.8 Shoulder Ankle We did shoulder 1st. Are the observations stable? If not, what is a plausible approach to estimating times?
Calculating Nerve Conduction Velocity 15 students, average height = 5 ft 8.8 in Total length = 15 x 68.8 in. = 1032 inches If ratio of head to height is approximately 1:7 to 1:7.5, let ankle to shoulder equal approximately 1-(1 head)% of total height or 1 – (1/7.25)% of height (86.2%). Thus total length traveled is approx. 1032 x 0.862 = 889.6 inches or 22.6 meters Difference between ankle and shoulder durations: Average: 4.34 seconds – 4.29 seconds = 0.05 seconds If not stable, use last observation in each series: 4.26 seconds – 3.84 seconds = 0.42 seconds Velocity = 22.6m/.05s = 452 m/s, as based on averages. Or 22.6m/.42s = 53.8 m/s as based on last observation in each series.

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Some data from other studies: touch 30 -76 meters/sec depending on body part and procedure Published results from a study that is like ours: foot to head: 34 meters/sec in the initial electronic reaction time study by Adolph Hirsh (1830-1901), a Swiss astronomer BC students September 23, 2008: 23.5 meters/sec, with a less precise stop watch than used this semester. Thus, it is reasonable to predict that if we repeated the study until the durations settled down to a stable level, we would end up with times that approximate the last observation of each series from Feb. 3, 2009, yielding an estimate of: 53.8 meters/sec
iClicker question on jealousy readings Which statement best characterizes why Harris and Christenfeld think it is reasonable for men to be more upset at sexual infidelity than at emotional infidelity?. A. = In women sexual relations imply an emotional attachment, whereas an emotional attachment does not imply sexual relations. Thus, a woman’s sexual infidelity is worse because two forms of infidelity are worse than one form of infidelity. B. Men cannot be certain that they are the father of their mate’s child. Hence evolution has made them particularly vigilant at insuring sexual fidelity in their mate. C. There are gender-based genetic differences in reasoning such that sexual infidelity is more threatening for men..

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