NeuroscienceLesson 1 of 1 in the course Sensory Systems

Sensory Transduction, Neural Encoding, Perception, and Weber’s Law

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

This lesson introduces how sensory systems detect information and convert it into signals the nervous system can use. These processes help organisms monitor both their bodies and the surrounding environment.

Humans have five special senses: olfaction (smell), gustation (taste), equilibrium (balance and body position), vision, and hearing. The general senses, also called somatosensation, respond to stimuli such as temperature, pain, pressure, and vibration.

All flashcards

What is somatosensation?
Somatosensation is the collection of general senses that detects information such as temperature, pain, pressure, and vibration, as well as aspects of body position and movement.
What is a receptive field?
It is the region in space or on the body where a particular sensory receptor can detect a stimulus.
What is a receptor potential?
A receptor potential is the change in electrical potential produced at a sensory receptor when it is stimulated. It is graded, so its magnitude can vary with stimulus strength.
How does a mechanoreceptor respond to pressure?
Pressure or bending can open gated ion channels in the receptor membrane. Ion movement changes the membrane potential and produces a receptor potential.
How do proprioception and kinesthesia differ?
Proprioception provides information about the positions of bones, joints, and muscles. Kinesthesia is the sense of limb movement and uses information about limb position.

Quiz questions

  1. How can sensory systems represent an increase in stimulus intensity?Answer: By increasing action-potential firing rate and recruiting more receptors.
  2. Which structure relays sensory information toward the cortex for all sensory systems except olfaction?Answer: The thalamus
  3. What is perception?Answer: The brain’s interpretation of sensory information.
  4. According to Weber’s Law, how does the just-noticeable difference relate to the original stimulus magnitude?Answer: It is proportional to the original stimulus magnitude.
  5. How do dedicated sensory pathways help the brain interpret incoming signals?Answer: They help identify the modality of the stimulus.

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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