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Related Concept Videos

Somatosensation01:33

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.
What is a Sensory System?01:31

What is a Sensory System?

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.
Sensory Perception: Organization of the Somatosensory System01:11

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...
Sensation01:21

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...
Associative Learning01:27

Associative Learning

Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
Classical conditioning, also known...
Sensory Functions of the Skin01:16

Sensory Functions of the Skin

The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...

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Aversive learning increases sensory detection sensitivity.

Fredrik Åhs1, Stacie S Miller, Amy R Gordon

  • 1Center for Cognitive Neuroscience, Duke University, 203 Research Drive, Durham, NC 27708, United States.

Biological Psychology
|November 24, 2012
PubMed
Summary
This summary is machine-generated.

Aversive conditioning enhances sensory detection of specific odors, making them detectable at lower concentrations. This heightened sensitivity is temporary, returning to baseline after eight weeks, and occurs outside conscious awareness.

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Science

Background:

  • Anxiety disorders often involve heightened environmental cue sensitivity.
  • Sensory processing changes can involve attention or altered detection thresholds.
  • Aversive conditioning is known to improve odor discrimination, but its effect on odor detection thresholds is unclear.

Purpose of the Study:

  • To investigate if aversive conditioning alters the absolute detection threshold for odors.
  • To determine if this effect is odor-specific and its duration.

Main Methods:

  • Classical conditioning paired one odor from an indistinguishable pair with an aversive outcome.
  • Odor detection and discrimination abilities were assessed before and after conditioning.
  • Detection thresholds were re-evaluated eight weeks post-conditioning.

Main Results:

  • Aversive conditioning significantly increased absolute sensory sensitivity to the predictive odor cue (20% lower concentration).
  • This effect was odor-specific.
  • Detection thresholds returned to baseline levels by the eight-week follow-up, indicating transient changes.

Conclusions:

  • Aversive conditioning can enhance absolute sensory sensitivity to biologically salient stimuli in a stimulus-specific manner.
  • This heightened sensitivity occurs outside conscious awareness and is transient.
  • Findings offer insights into sensory mechanisms in anxiety disorders and classical conditioning.