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Sensation

Sensation

Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
Absolute thresholds can quantify the sensitivity of sensory...

Sensory Modalities

Sensory Modalities

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.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...

Introduction to Special Senses

Introduction to Special Senses

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 functions.

Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

Tactile and Chemical Senses

Tactile and Chemical Senses

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. This...

Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

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:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

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Updated: Jun 30, 2026

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Published on: January 7, 2019

Sentience and sensation.

Jerald Silverman¹

¹Department of Animal Medicine, University of Massachusetts Medical School, Worcester, MA 01655, USA. jerald.silverman@umassmed.edu

|September 24, 2008

Summary

This summary is machine-generated.

Determining a "less sentient" species for biomedical research is crucial for ethical animal use. This essay explores the complex relationship between sentience, pain, and species within vertebrate evolution.

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Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

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Area of Science:

Animal research ethics
Comparative psychology
Vertebrate phylogeny

Background:

Ethical guidelines for animal research mandate using the least sentient species capable of meeting study objectives.
The principle of Replacement, one of the 3Rs (Replacement, Reduction, Refinement), emphasizes using less sentient species.
Defining 'less sentient' remains challenging, raising questions about species' capacity for pain, intelligence, and self-awareness.

Purpose of the Study:

To explore the concept of 'less sentient' species in the context of biomedical research.
To investigate the relationship between sentience, pain perception, and phylogenetic relatedness in vertebrates.
To clarify the criteria for selecting less sentient species for research activities involving potential pain or distress.

Main Methods:

Conceptual analysis of sentience, pain, and intelligence across species.
Review of ethical frameworks and regulations governing animal research (e.g., the 3Rs).
Exploration of vertebrate phylogeny to understand evolutionary relationships and potential correlates of sentience.

Main Results:

Sentience is a complex trait, not easily quantifiable or ranked linearly across species.
Pain perception and self-awareness may vary significantly even within closely related species.
Phylogenetic position offers a potential, though not definitive, framework for assessing relative sentience.

Conclusions:

A nuanced understanding of sentience is required for ethical application of the Replacement principle in animal research.
Further research is needed to establish clearer biological and ethical criteria for defining and comparing sentience across vertebrate species.
Ethical decision-making in animal research must consider the multifaceted nature of sentience, pain, and cognitive abilities.