5. • Already we have two issues to bear in
mind when assessing sense
perception as a way of knowing
• We may fail to see something that is
there
• We may see something that is
(possibly) not there
12. Moving pictures can also be
problematic…
• http://www.youtube.com/watch?v=sKa0eaKsdA0
http://www.youtube.com/watch?v=jP_jYmbke14
• http://www.michaelbach.de/ot/mot_adapt/index.html
13. Concentrate on the cross in the middle, after a while you will notice that this
moving purple dot will turn green!
What happens after you„ve
looked at the cross a bit
longer ?
14. On the other hand, motion may
clarify what we see
• picture 1
• picture 2
15. What causes these problems?
• Context may mislead us
• There may be different, but equally valid
interpretations of what we see
• We may see something only when
someone else tells us it is there
• We jump to conclusions, seeing what
we expect to see
• We impose order on what we see
16. Are there similar problems with
our other senses?
• taste
• smell
• touch
• hearing
• any other senses
17. Some sound problems
• http://asa.aip.org/demo27.html
• http://jeffmilner.com/backmasking.htm
18. There is some reading for you to take away
about sense perception for bats.
19. Conclusions?
• The sensations we experience are subject to the
limitations of the body‟s sensory systems and may not
therefore be a true representation of the external world
Examples could include
• frequency limitations for hearing which vary with species
or individual
• sight limitations such as colour-blindness or lack of focus
• psychological effects may cause sensations without an
external cause.
• temporary confusion may be induced by conflicting
messages
or
• we may overinterpret what we sense!
20. We could say…
Our internal constructions may
differ from the external world
or
“The eye is not a camera”