PSYA01H3 Lecture Notes - Lecture 3: Psychophysics, Hermann Von Helmholtz, Sigmund Freud

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PSYA01 – Introduction to Psychology Part 1 Lecture 1.2
Lecture 3: The Birth and Early Years
Germany
believed that you must invest in research to benefits its country and stay economically
strong
Hermann Von Helmholtz (1821-1894)
Measuring speed of neural impulses
How quickly can singles be sent through the brain to our body
oHold hands with the people beside you, a long chain of humanity
oFigured out the average of every human being from fingertip to fingertip
oUsed a stop watch
It was possible to find a precise measurement in experiments
Ernst Weber (1795-1878)
Psychophysics = how things work in our minds
Experiments: hold our your hands, and blind folded
oPut two weights on each hand, and asked to say which one he thinks is heavier
oFound out: we have limits, you can’t tell the difference
oJND = just noticeable difference
If started with 20grams and 22grams… you can detect the difference
If started with 200grams, and 202grams… you can’t detect the difference
Therefore, you must have at least 10% of the weight to feel the difference
Also, works with sound
Studying the mind, the perception and the mathematical rules
Can someone scientifically study the mind?
Willhelm Wundt
First to refer himself as a psychologist
Wrote the first psychology textbook “the principles of physiological psychology”
Introspection
oTrain people to look in their mind
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Document Summary

Germany believed that you must invest in research to benefits its country and stay economically strong. It was possible to find a precise measurement in experiments. If started with 20grams and 22grams you can detect the difference. If started with 200grams, and 202grams you can"t detect the difference. Therefore, you must have at least 10% of the weight to feel the difference. Willhelm wundt: first to refer himself as a psychologist, wrote the first psychology textbook the principles of physiological psychology . Introspection: train people to look in their mind. What was happening in your mind: he was a structuralist, was interested in what you were feeling, hearing and seeing what conscious experience was like for you, scientists did not feel that that is very reliable: Subjective measure = getting somebody to describe something that is going on to you, must trust that person. Objective measure = directly measuring something with some instrument.

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