Concepts about Sensations

September 4, 2012
by Pharm Tao

Concepts about Sensations

 

Concepts

Explanations

Sub-concepts/Examples

Explanations

Sensation Detection and translation of physical stimulus (sound, light, texture, flavor, etc.) into action potentials via receptor cells in the peripheral nervous system    
Transduction The process the stimuli are turned into neural signals    
Thresholds To detect a stimulus Absolute threshold Detection of a stimulus >= 50% of the time ideally
Subliminal “Below the threshold”, the input cannot be detected >= 50% of the time
Difference threshold (just noticeable difference (JND)) The smallest difference that can be detected >= 50% of the time
Weber’s law (hypothesis) Detectable changes are proportional to the original stimulus strength – the stronger the stimulus, the bigger the increase needed to feel the difference
Sensory adaptation The process that the brain reduces the priority of message to “get used to it” Hypnosis The person (usually with the guidance of the hypnotist) focuses on certain thoughts/sensations and ignores others (e.g., pain signals)
Perception The interpretation of messages from stimuli    

 

Sensations

 

Sensations

Common Features

Vision  
Hearing  
Smell The chemical senses (molecules of odor)
Taste Chemical senses (molecules of flavor)
Touch The body senses
Balance The body senses
Kinesthetic (weight, strain, position of joints, muscles) The body senses
Pain The body senses

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