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sensation


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Alex Bellini


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transduction
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stimulus converted into nerve impulses

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sensation - Details

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47 questions
🇬🇧🇬🇧
Transduction
Stimulus converted into nerve impulses
Absolute threshold
Lowest intensity of stimulus which can be detected 50% of the time
Signal detection theory
Factors that influence sensory detection
Difference threshold
Difference between two stimuli that can be detected 50% of the time
Weber's Law
Difference threshold directly proportional to magnitude of stimulus
Myopia
Shortsightedness
Hyperopia
Farsightedness
Fovea
Area in the centre of retina, packed with cones
Photopigments turn....
Light waves into nerve impulses
Trichomatic theory
Any colour created through combination of red, green, blue
Young-Helmholtz trichomatic theory
Three colour receptors: green, blue, red
Frequency
Number of wave cycles per second
Amplitude
Vertical size of the sound waves
Cochlea
Fluid filled tube in the inner ear
Basilar membrane
Sheet of tissue runs length of cochlea
Organs of corti
Sheet of tissue that rests on Basilar Membrane
Frequency theory of pitch perception
Sound waves are matched by nerve impulses
Place theory of pitch perception
Frequency dictates where wave peak
Conduction deafness
Problems with mechanical system that transmits sound waves to the cochlea
Nerve deafness
Damaged receptors within inner ear or auditory nerve
Gustation
Sense of taste
Olfaction
Sense of smell
Taste buds
Chemical receptors along the tongue
Taste buds respond to four quantities
Sweet, salty, sour, bitter
Olfactory receptors occupy...
Upper part of nasal cavity
Olfactory bulb
Forebrain structure above the nasal cavity
Pheromones
Chemical signals found in body scents
Menstrual synchrony
Women in close contact sometimes match menstrual cycles
Phantom limb phenomenon
Feeling pain in amputated part of body
Gate theory
Opening and closing of gate mechanism determines level of pain
Endorphins
Block neuro-transmission of pain impulses from spinal cord to brain
Kinaesthesis
Feedback about joint movements and position
Vestibular sense
Sense of body orientation and equilibrium
Central control mechanism
Nerve impulses from brain can influence pain impulse spreading