Sensations Flashcards

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1
Q

What are receptor cells and where are they situated?

A

1- cells that recept and transfer information

2- in sensory organs such as eyes or ears

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2
Q

What stimulates receptor cells?

A
physical energy (light waves or sound waves) 
molecules (taste/smells)
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3
Q

The brain cannot process raw data, so what do receptor cells do? give the right terminology and explain

A

transduction

transforms signals in action potentials

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4
Q

Vision:
transduction is accomplished by transforming _____ into action potential. 2 types of receptor cells are stimulated, what are their group name and individual name?

A

light waves
photoreceptors
rods and cones

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5
Q

Rods: what kind of light, what kind of shades

A
dim light (night vision)
shades of grey
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6
Q

Cones: what kind of light, what kind of shades

A

adequate light

colours

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7
Q

Which one of the two photoreceptors offers the best vision?

A

cones

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8
Q

What is the absolute threshold? %

A

smallest detectable intensity.

50% of the time people detect it.

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9
Q

What causes colorblindness?

A

cones disfunction

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10
Q

What is positive sensory adaptation? example

A

how we can adapt to our environment and be more sensitive to hard-to-detect stimulus.
Like dark-adapted with pupils

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11
Q

What is negative sensory adaptation? What causes it?

A

exposed constant stimulus, less senstitive.

cells fire action potential constantly. Fatigue. slow down their right.

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12
Q

What is the difference threshold and JND (what do letter mean)

A

smallest detectable change in the intensity that people detect 50% of the time
Just noticeable difference.

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13
Q

What is the Weber’s Law?

A

change works with %, not in #.

higher intensity background, higher the change

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14
Q

What is the difference between perception and sensation?

A

Perception is organized depending on inner interpretation. It is not automatic as sensations are.

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