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Related Concept Videos

Introduction to Special Senses01:26

Introduction to Special Senses

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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Sensory Modalities01:15

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Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Understanding Consciousness01:23

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Consciousness can be defined as the state of being aware of and able to think about one's existence, sensations, and surroundings. It encompasses two major components: awareness and arousal. Awareness pertains to the recognition of environmental stimuli and internal states. At the same time, arousal refers to the physiological readiness to engage with these stimuli, which varies significantly between states like sleep and wakefulness.
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What is a Sensory System?01:31

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Observing the Transformation of Bodily Self-consciousness in the Squeeze-machine Experiment
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Sensing, feeling and consciousness.

Antonio Damasio1, Hanna Damasio1

  • 1Brain and Creativity Institute and Department of Psychology, Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA 90089, USA.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 15, 2024
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Summary
This summary is machine-generated.

Organisms maintain homeostasis through sensing and responding. Complex organisms with nervous systems use conscious feelings, while simpler life forms use covert mechanisms for survival.

Keywords:
consciousnessexperiencefeelinginteroceptionsubjectivity

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Area of Science:

  • Physiology
  • Neuroscience
  • Evolutionary Biology

Background:

  • Homeostasis is crucial for life, maintained by diverse mechanisms across biological complexity.
  • Organisms without nervous systems (unicellular, plants) utilize covert sensing and responding.
  • Organisms with nervous systems employ overt consciousness, rooted in homeostatic feelings.

Purpose of the Study:

  • To explore the evolution of sensing and responding mechanisms for homeostasis.
  • To differentiate between covert and overt mechanisms of physiological regulation.
  • To understand the role of subjective experience in nervous system-based homeostasis.

Main Methods:

  • Comparative analysis of homeostatic strategies in different life forms.
  • Review of physiological and neurological data on sensing and response.
  • Integration of evolutionary and subjective experience perspectives.

Main Results:

  • A spectrum of homeostatic regulation exists, from covert to overt consciousness.
  • Homeostatic feelings are fundamental to subjective experience in complex organisms.
  • Nervous systems enable sophisticated, experience-based homeostasis.

Conclusions:

  • Homeostasis is achieved through both covert and overt regulatory pathways.
  • Consciousness, driven by homeostatic feelings, represents an advanced regulatory strategy.
  • Understanding this spectrum is key to an integrative approach to sensory processing and emotion.