Who are you going to believe, me or your lying eyes? Groucho Marx - - PowerPoint PPT Presentation

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Jun 28, 2023 247 likes •570 views

http://www.physics.smu.edu/pseudo Who are you going to believe, me or your lying eyes? Groucho Marx http://www.physics.smu.edu/pseudo Observation and Perception Supplementary Material for CFB3333/PHY3333 Professors John Cotton and

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“Who are you going to believe, me or your lying eyes?” – Groucho Marx

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Observation and Perception

Supplementary Material for CFB3333/PHY3333 Professors John Cotton and Stephen Sekula February 1, 2012 Based on the following information on the web: http://www.physics.smu.edu/pseudo/Observ

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Eyewitness Exercise

http://www.physics.smu.edu/devel/pseudo/Observ/description.html

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Advanced 3-D CGI HDR Rendering of Suspect

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Eyewitness Testimony

In the pantheon of scientifc evidence, how does

eyewitness testimony rank?

in the legal system, it is considered a useful form of

evidence and plays a central role in trials

Eyewitness testimony is compelling, emotional

evidence in the courtroom, but scientifcally it is the WEAKEST form of evidence.

Witnesses can be completely sincere, completely sure of

what they saw, and completely WRONG!

Witnesses can also lie, but even when sincere they may not

have seen what they claim to have seen.

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Observation and Perception

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The Scientifc Method A Brief Review

Observation of a phenomenon
what kind of observations?
how reliable are the observations?
Formulation of an hypothesis
how does one begin to form a causal explanation for the phenomenon?
what evidence is used to generate the hypothesis?
how reliable is the evidence?
Performance of experiment
what means are available for testing different properties or ideas?
how does one setup a reliable experiment?
how does one gather information from the experiment?

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The Scientifc Method A Brief Review

Observation of a phenomenon
what kind of observations?
how reliable are the observations?
Formulation of an hypothesis
how does one begin to form a causal explanation for the phenomenon?
what evidence is used to generate the hypothesis?
how reliable is the evidence?
Performance of experiment
what means are available for testing different properties or ideas?
how does one setup a reliable experiment?
how does one gather information from the experiment?

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Questions to Ask

Are we “perfect observing machines?”
if not, how might our perceptions be fawed or

compromised?

What assumptions enter into our perception?

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The Human Eye

Vitreous humor Aqueous humor

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My Human Eye

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The Blind Spot Test

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http://www.youtube.com/watch?v=bOP37A1EhEs

A Movie of Many Optical Illusions

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http://www.physics.smu.edu/pseudo Kurt Wenner, Street Painting

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Questions to Ask

Are we “perfect observing machines?”
if not, how might our perceptions be fawed or

compromised?

What assumptions enter into our perception?
our brains handle an onslaught of visual and audio

stimuli by frst assuming nothing has changed since the last time we looked/listened (assume the status quo)

paradigms, existing hypotheses or theories, etc.

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Paradigm

A "paradigm" is a world view or perspective formed from

known theories.

For instance, once these were accepted as fact:

– The sun and everything else went around the earth – Crop failures or other strange phenomena were caused by witchcraft,

and it was moral to burn women accused of witchery

– disease is caused by demons or bad air – the continents of the earth are fxed in place and the earth is

unchanging

– all matter is infnitely divisible into every smaller pieces, forming a

“continuum” (the atomic theory of matter is only ~100 years old!)

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Pareidiolia

When a vague or obscure stimulus is perceived

as clear and distinct

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1976 Viking orbiter image. 400 meters/pixel 1204x1056 pixels per raw image. This image is made after applying image processing techniques.

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http://www.physics.smu.edu/pseudo 2001 Mars Global Surveyor, 2 meters/pixel resolution

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http://www.physics.smu.edu/pseudo 2006 Mars Express, 13.7 meters/pixel

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