testing human vision, hearing, tactile and thermal...
TRANSCRIPT
Human perception
Testing human vision, hearing, tactile and thermal sensation
Analysis and evaluation of the recorded data
ELUP students
Experiment was accomplished by: ......................................................
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Teacher: ....................................................... Date: .......................................................
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Aims of the practical lesson (brief definition in a few sentences) A. Introduction (can be continued on a separate sheet if needed)
1. Brief introduction to human senses – main characteristics of physiological features influencing visual, auditory, thermal or tactile perception (summary of the most important facts with regard to the analysis of the practical data)
2. Description of materials, instruments (schematic enumeration) and details of the practical exercises (brief explanation)
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B. Data and calculations
1. Investigating thermal sensation Name of Subject: ...................................................................................... When the two hands were immersed at the same time to cold or warm water, in which case did you observe faster adaptation? cold receptors warm receptors
What did you observe when the two hands, adapted previously to cold or warm water, were
immersed at the same time into room temperature water?
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2. Testing mechanical discrimination thresholds Name of Subject: ...................................................................................... List the discrimination threshold values determined in the following areas:
finger pad:..................... palm:...................... back of the hand: .....................
forearm:......................... upper arm:...................... back:............................................
3. Sound localization test Name of Subject: ...................................................................................... Mark in the table below, how the variations of the eartubes of the phonendoscope influenced the direction perception of the Subject!
Eartubes of the phonendoscope Direction: Middle/Right/Left
Two eartubes have the same length
Right eartube 10 cm longer
Right eartube 20 cm longer
Left eartube compressed, two eartubes have the same length
Left eartube compressed, right eartube 10 cm longer
Left eartube compressed, right eartube 20 cm longer
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4. Rinne’s test: comparing air and bone conductance Name of Subject: ...................................................................................... Compare the times during which the Subject heard the sound (not only felt the vibration!) of the vibrating sound fork:
top of the head :.........sec ......... in the air close to the ear:.............sec
5. Purkinje’s blood vessel shadow experiment using the sclera lamp Name of Subject: ...................................................................................... Description of the observations:
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6. Testing the near point of the eye and the sharpness of vision
Name of Subject: ......................................................................................
a) Subject’s near point of vision: left eye:.................. right eye:......................
b) Subject’s sharpness of vision: left eye:.................. right eye:......................
7. Testing astigmatism (spherical curvature problems) Name of Subject: ...................................................................................... Description of the observations:
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8. Determining the black-and-white and coloured field of view: perimetry Name of Subject: ......................................................................................
Number of the attachment(s): ................
Where is the blind spot on the recordings?
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9. Testing colour vision: Stilling-Ishihara tables Name of Subject: ...................................................................................... Description of the observations:
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C. Summary of the observations and conclusions
1. Investigating thermal sensation
Explain the difference in the adaptation speed of the warm vs. cold receptors!
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Why did room temperature water evoke different sensations in your hands previously immersed
into warm and cold water?
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2. Testing mechanical discrimination thresholds Explain the differences in tactile discrimination thresholds of the different body parts!
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................................................................................................................................................ 3. Sound localization test Which anatomical structures of the human auditory pathway play a role in sound localization and how?
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................................................................................................................................................ Explain your findings after the lengthening of the eartube and the compression of the eartube!
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4. Rinne’s test: comparing air and bone conductance In case of the Subject, air conductance bone conductance was more efficient Explain your findings! Did you get the expected results for a healthy person?
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................................................................................................................................................ How and when can it happen that bone conductance works more efficiently than air
conductance?
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5. Purkinje’s blood vessel shadow experiment using the sclera lamp What does the blood vessel shadow experiment prove?
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6. Testing the near point of the eye and the sharpness of vision
Is the near point of the Subject’s eye normal for his/her age?
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................................................................................................................................................ If not, what kind of glasses can be used to correct the problem?
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How did you determine the sharpness of vision of the Subject?
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................................................................................................................................................ If the decreased sharpness of vision is caused by a refraction abnormality of the eye, what kind of
glasses can be used to correct the problem?
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7. Testing astigmatism (spherical curvature problems) How can you recognize an astigmatic eye with Placido’s disc?
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................................................................................................................................................ Does the Subject have astigmatism? yes no
How can astigmatism be corrected?
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8. Determining the black-and-white and coloured field of view: perimetry Is there a difference between the normal (control) and the Subject's field of vision? yes no
How can you explain it? What influences the size of the field of view? ..............................................................................................................................................
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................................................................................................................................................ Is there a difference between the size of the black-and-white and coloured field of vision? yes no
Explain your findings!
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Is there a difference between the position of the blind spot in case of the black-and-white or
coloured field of vision? yes no
Why does the blind spot develop?
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9. Testing colour vision: Stilling-Ishihara tables Does the Subject have colour blindness? yes no Why are Stilling-Ishihara tables suitable to recognize colour blindness?
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What types of colour blindness can develop, what is their physiological background?
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Who has the higher chance to have colour blindness? females males equal Why?
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D. Definitions decibel:...................................................................................................................................
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diopter:..................................................................................................................................
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perimeter:................................................................................................................................
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astigmatism:............................................................................................................................
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sharpness of vision:................................................................................................................
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receptive field:........................................................................................................................
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