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Psyc 401 Alternate 1st lab

Psyc 401 Alternate 1st lab - PSYC 401 LAB MANUAL LAB 1 ECGS...

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PSYC 401 LAB MANUAL LAB 1 - ECGS PAGE 1 Core Questions How do you detect and measure bioelectric signals? What is a compound action potential? What is the electrical activity of the heart? What is electrical noise and how do you di f erentiate it from the biological activity? How does recording electrode geometry a f ect the way an an ECG looks? How do I use the CHART program to collect and analyze data? What are the some good graphical ways to look at and present data? The Electric Human Electrical signals underlie all nerve and muscle activity WHAT ARE WE GOING TO DO? First you will learn the basics of using our data acquisition system, ADInstruments CHART. Then you will quantitatively study the compound action potentials generated by the heart during its contraction cycle. Finally, you will assess the e f ects of autonomic nervous system stimulation on the ECG and cardiac rhythm. Web resources: Some brief but useful video clips Animated ECG illustrations (select topic ‘electrocardiogram’) Shows many ECG abnormalities An ECG game The electrocardiogram ( ECG ) is one of the most basic tools for monitoring heart function because it reports the electrical activity during the di f erent portions of the heart beat cycle. It is essentially a series of compound muscle action potentials from the di f erent parts of the heart when they are contracting. Many factors can a f ect heart rate. One of these is autonomic nervous system ( ANS ) activity, which, in turn is a f ected by emotional and physiological state. Autonomic function is normally ‘unconscious,’ but there are claims for voluntary control of the ANS.
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PSYC 401 LAB MANUAL LAB 1 - ECGS PAGE 2 An electrode simply and solely detects electric current. It ‘picks up’ all of the electric signals near it, regardless of their source. It does not selectively pick up biological signals. The output of an electrode is the product of the biological signal plus non - biological electrical activity ( noise ) plus other biological signals plus electrical e f ects caused by the environment and geometry. Animal Amplifer A/D converter CHART Electrodes A CRUCIAL POINT: If a nearby biological signal changes, the electrode will probably detect the change. However, the reverse is not true: a change in the output of the electrode does not necessarily mean that the biological signal is di f erent. It’s possible that the biological signal is the same, but something in the electrical environment may have changed, and therefore the electrode will ‘see’ a di f erent signal. The nervous system uses electrical signals ( action potentials = APs = spikes ) for communication between neurons and between neurons and muscles. Muscles themselves use the same types of signals to
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Psyc 401 Alternate 1st lab - PSYC 401 LAB MANUAL LAB 1 ECGS...

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