sensation n.
Skip this Video
Loading SlideShow in 5 Seconds..
SENSATION PowerPoint Presentation
Download Presentation

Loading in 2 Seconds...

play fullscreen
1 / 11

SENSATION - PowerPoint PPT Presentation

  • Uploaded on

SENSATION. Jayme Shadowens. Senses = filters Process incoming information Physical stimulation into neural impulses that give us sensations

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'SENSATION' - reba

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


Jayme Shadowens


Senses = filters

    • Process incoming information
    • Physical stimulation into neural impulses that give us sensations
  • Sensation: the process by which stimulation of a sensory receptor produces neural impulses that the brain interprets as a sound, a visual image, an odor, a taste, a pain, or other sensory image
  • Perception: a mental process that elaborates and assigns meaning to the incoming sensory patterns
    • Perception creates an interpretation of sensation
purpose of sensation
Purpose of sensation
  • Aid survival
    • Directing towards stimuli (food, mates, shelter, friends)
  • Find pleasure in music, art, athletics, food, sex
  • Sensory receptors convert stimuli from outside world into neural signals that we can comprehend
  • Transduction: transformation of one form of energy into another—especially the transformation of stimulus information into nerve signals by the sense organs
  • Step One: detection by sensory neuron of the physical stimulus
  • Step Two: when the appropriate stimulus reaches a sense organ, it activates specialized neurons called receptors
  • Step Three: receptors convert their excitation into a nerve signal
  • Step Four: neural signal follows sensory pathway by the way of the thalamus to brain
  • Step Five: brain extracts information about the basic qualities of the stimulus
sensory adaptation
  • Sensory adaptation: loss of responsiveness in receptor cells after stimulation has remained unchanged for a while
  • Unless it is intense or painful, stimulation that persists without changing in intensity for some other quality usually shifts into the background of our awareness

A swimmer becomes adapted to the temperature of water

You don’t continually notice the feel of the shoes on your feet

  • Absolute threshold: the amount of stimulation necessary for a stimulus to be detected.
    • Presence or absence of a stimulus is detected ½ the time over many trials
  • Difference threshold: the smallest amount by which a stimulus can be changed
    • Difference can be detected ½ the time
    • Just noticeable difference (JND)

Fechner’s Law

    • Relationship between perceived magnitude and actual magnitude of stimulus
    • S = k log R (s = sensation, R = stimulus, k = a constant that differs for each sensory modality)
    • An increase in the physical magnitude progressively produces smaller increases in perceived magnitude

Steven’s power law

    • More accurate than Fechner’s law
    • Covers wider variety of stimuli
signal detection theory
  • Classical theory of thresholds ignored the effects of the perceiver’s physical condition, judgments or biases
  • Signal Detection Theory
    • Explains how we detect signals
    • Sensation depends on the characteristics of the stimulus, the background stimulation, and the detector
    • Sensation is a judgment the sensory system makes about incoming stimulation

The judgment a person makes about a sound they hear in the middle of the night all depends on their keenness of their hearing and what they expect to hear (mental state).