Touch, Itch and Tickle The existence of different types of sensations is attributed to the fact that every kind of sensory neuron can react to one a single type of stimulus. This in turn generates a specific impulse following the conversion of the stimulus into a graded potential. Given the existence of different kinds of sensations, there are two major categories of sensory modalities i.e. general senses (somatic and visceral) and special senses.
The human brain plays a crucial role in the sensations of touch, itch and tickle as well as the perception of these sensations. This is primarily because the brain enables us to feel these sensations and the processes that contribute to them. While the brain allows us to feel these sensations, it sometimes plays tricks on us with regards to touch, itch and tickle. Generally, sensations like touch, itch and tickle can be described as conscious or unconscious awareness of internal or external stimuli. The perception of these sensations is in turn described as the conscious understanding and interpretation of these feelings. The role of the brain in sensations and their associated perceptions is attributable to brain components that obtain sensory input, integrate and hoard information, and convey motor reactions.
Touch, itch and tickle are examples of sensory experiences brought by either internal or external stimuli or conditions in the body. The nature of each of these sensory experiences is dependent on the destination of stimuli or impulses in the central nervous system, which also influences the type of reaction generated from the sensation. The occurrence of these sensations is usually characterized by several events including stimulation of the receptor, transformation of the stimulus into a graded probability, production of impulses once the graded probability reaches threshold, and combination or integration of the sensory stimuli by the central nervous system (Kenny, n.d.).
There are different kinds of sensations that are largely influenced by sensory modalities including touch, vision, itch, tickle, vibration, ...
Role of the Brain in Sensory Experiences
As previously mentioned, the human brain plays a crucial role in our ability to experience and feel different sensations such as touch, itch and tickle. In this case, the human brain not only influences ability to feel these sensations but also influence our perceptions of the sensations. According to Goldstein (2010), touch, itch and tickle are among commonplace sensory experiences that are part of a huge constellation of skin senses. While these sensations are sometimes linked perceptually, they are usually distinct since they are provoked by significantly different stimuli. For instance, itch is evoked by chemicals that are particular for the sensation which tickle is evoked by touch stimulation.
Our brains allow us to feel these sensations through the various tactile receptors that are linked to a wide range of nerves. Most of these tactile receptors use A beta fibers to convey their signals from the skin to the brain through an extremely rapid process. The human brain comprises various components which interact to obtain sensory input, combine and store associated information, and convey different motor responses. Moreover, there are different pathways for sensations from the skin or body to the brain as well as pathways for motor responses from the brain to the body. The posterior column pathway carries sensory information up the spine to the brain, which in turn contributes to conscious awareness and understanding of the sensory experiences.
In essence, the human brain is where all sensory information delivered from various body parts is integrated and processed in the primary sensory cortex. Once these signals from the body are received by the brain, they are sorted and classified depending on the nature…
The existence of different types of sensations is attributed to the fact that every kind of sensory neuron can react to one a single type of stimulus. This in turn generates a specific impulse following the conversion of the stimulus into a graded potential. Given the existence of different kinds of sensations, there are two major categories of sensory modalities i.e. general senses (somatic and visceral) and special senses.
Fluctuations in expectation may be described by a model that actually calculates expectation using a weighted combination of new and old information. According to this model, when the probability of a target's appearance changes abruptly, a smooth change occurs that encodes prior probability. This model even predicts small changes in expectation even when there is a constant probability of appearance of the target (Anderson & Carpenter, 2006). The experience-based
Sensory Perceptions Three Reasons for Believing in the Accuracy or Inaccuracy of Sensory Information Sensory perception can be defined as the process of receipt of stimuli and then their organization and interpretation by using the five senses for making the meaning of one's surrounding environment. In other words, it is the process by which a person acquires an understanding of his/her environment (Kemp, Hollywood & Hort 2009). Thus, by employing sensory perceptions,
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Reshaping the Sensory Environment Sensory Accuracy Survival of all animals depends on the accuracy with which sensory information is processed by the nervous system. Integrating this information in an efficient and effective manner depends on dynamic strategies that the nervous system relies on to determine the reliability and accuracy of the sensory inputs (reviewed by Zaidel, Turner, and Angelaki, 2011). This essay examines contemporary theories that attempt to explain how these strategies
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