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Related Concept Videos

Sensation01:21

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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.
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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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The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
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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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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.
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A Two-interval Forced-choice Task for Multisensory Comparisons
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Weak universality in sensory tradeoffs.

Sarah Marzen1,2, Simon DeDeo3,4,5

  • 1Department of Physics, Redwood Center for Theoretical Neuroscience, University of California at Berkeley, Berkeley, California 94720, USA.

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Summary

Organisms hard-code sensory neuron numbers despite environmental changes. Rate-distortion theory shows this number relies on long-term environmental statistics, not immediate conditions, for developmental efficiency.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Information theory

Background:

  • Sensory neuron numbers are primarily set during development.
  • Environments can change significantly within an organism's lifetime and across generations.
  • This raises questions about how fixed developmental programs adapt to variable environments.

Purpose of the Study:

  • To investigate how organisms can effectively determine sensory neuron numbers developmentally.
  • To explore the relationship between environmental variability and developmental strategies.
  • To apply rate-distortion theory to understand the constraints on sensory system development.

Main Methods:

  • Utilized rate-distortion theory.
  • Employed a combination of computational simulation and theoretical analysis.
  • Modeled the impact of environmental statistics on developmental costs.

Main Results:

  • The rate-distortion function, representing developmental costs, is primarily influenced by coarse-grained environmental statistics.
  • These statistics are stable over evolutionary timescales, not rapid environmental fluctuations.
  • This suggests a developmental strategy optimized for long-term environmental predictability.

Conclusions:

  • Hard-coding sensory neuron numbers is an efficient strategy when relying on predictable, coarse-grained environmental statistics.
  • Developmental programming is robust to short-term environmental changes.
  • Rate-distortion theory provides a framework for understanding evolutionary trade-offs in biological development.