Examples of sensation in the following topics:
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- 'Phantom limb sensation' is characterized by feeling as if a missing limb were still attached to the body.
- Phantom limb sensations include pain, itches, twitching, and feelings of gesturing.
- Approximately 60 to 80 percent of individuals with an amputation experience phantom sensations in their amputated limbs, and the majority of the sensations are painful.
- Phantom pains are often described as burning or similarly strange sensations and can be extremely agonizing for some people, but the exact sensations differ widely for individuals.
- Other induced sensations include warmth, cold, itching, squeezing, tightness, and tingling.
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- The goal of sensation is detection, while the goal of perception is to create useful information about our environment.
- Sensation and perception are two distinct stages of processing during human sensing.
- Sensation is a function of the low level, biochemical, and neurological mechanisms that allow the receptor cells of a sensory organ to detect an environmental stimulus.
- In other words, the goal of sensation is detection, while the goal of perception is to create useful information about the environment.
- Transduction can be likened to a bridge connecting sensation to perception.
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- Sensation involves the relay of information from sensory receptors to the brain and enables a person to experience the world around them.
- Sensation and perception are two separate processes that are very closely related.
- Sensation is input about the physical world obtained by our sensory receptors, and perception is the process by which the brain selects, organizes, and interprets these sensations.
- This fMRI chart shows some of the neural activation that takes place during sensation.
- Explain how the brain and sensory receptors work together in the process of sensation
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- Sensation refers to our ability to detect or sense the physical qualities of our environment.
- Paresthesia
is a sensation of tingling, pricking, or numbness
of the skin that may result from nerve damage and may be permanent or
temporary.
- Temperature sensing or thermoception: The sensation of heat and the absence of heat (cold).
- While the exact definition of sensation is still controversial, most scientists agree that all senses rely on four fundamental sensory capacities:
- Describe what sensation means in terms of the peripheral nervous system
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- When you rest your hands on a table or put clothes on your body, at first the touch receptors will recognize that they are being activated and you will feel the sensation of touching an object.
- Meissner's corpuscles are sensory triggers of physical sensations on the skin, especially areas of the skin that are sensitive to light and touch.
- For example, the constant touch of clothes on our skin leads to our sensory adaptation to the sensations of wearing clothing.
- Notice that when you put an article of clothing on, after a brief period you no longer feel it; however you continue to be able to feel other sensations through it.
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- Example symptoms of cord compression include back pain, a dermatome of increased sensation, paralysis below the compression, decreased sensation below the compression, and more.
- Symptoms suggestive of cord compression are back pain, a dermatome of increased sensation, paralysis of limbs below the level of compression, decreased sensation below the level of compression, urinary and fecal incontinence and/or urinary retention.
- Lhermitte's sign (intermittent shooting electrical sensation) and hyperreflexia may be present.
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- Reception is the first step in the processing of sensation and is dependent on the receptor type, stimulus, and receptive field.
- Vestibular sensation, which is an organism's sense of spatial orientation and balance, proprioception (position of bones, joints, and muscles), and the sense of limb position that is used to track kinesthesia (limb movement) are part of somatosensation.
- The first step in sensation is reception: the activation of sensory receptors by stimuli such as mechanical stimuli (being bent or squished, for example), chemicals, or temperature.
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- Any sensation of interest is perceived by the senses and travels to the thalamus of the human brain.
- The thalamus combines these sensations into one solitary experience.
- The hippocampus then analyzes the sensations and decides if they are worth committing to long-term memory.
- In other words, with new experiences and sensations, the brain creates new connections and can "rewire" itself to create new memories.
- People create a mental picture of the sensations or new information they encountered, which is stored in iconic and working memory prior to its storage in a person's long-term memory.
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- Diseases of the brainstem can result in abnormalities in cranial
nerve function, leading to visual and hearing disturbances, changes in
sensation, muscle weakness, vertigo, coordination problems, swallowing and
speech difficulty, and voice changes.
- This includes the corticospinal tract (motor), the posterior column-medial lemniscus pathway (fine touch, vibration sensation, and proprioception) and the spinothalamic tract (pain, temperature, itch, and crude touch).
- The ascending pathways from the body to the brain are the sensory pathways, including the spinothalamic tract for pain and temperature sensation and the dorsal column, fasciculus gracilis, and cuneatus for touch, proprioception, and pressure sensation.
- The facial sensations have similar pathways and also travel in the spinothalamic tract and the medial lemniscus.
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- Finger nails are made of keratin and they perform two major functions: protection and sensation.
- The fingernail generally serves two purposes: as a protective plate and enhances sensation of the fingertip.
- The protection function of the fingernail is commonly known, but the sensation function is equally important.