Low Dopamine = Aggressive, Distracted Behavior

Standard

“People with lower levels of the brain chemical dopamine are more likely to be highly aggressive in competitive situations, a small new study indicates.

During the game, participants with lower levels of dopamine were more distracted from their attempts to win money and were more likely to show aggressive behavior,”

Advertisements

“….dopamine neurons appear to emit an alerting message about the surprising presence or absence of rewards. All responses to rewards and reward-predicting stimuli depend on event predictability. Dopamine neurons are activated by rewarding events that are better than predicted, remain uninfluenced by events that are as good as predicted, and are depressed by events that are worse than predicted.”

Standard

“…dopamine neurons appear to emit an alerting message about the surprising presence or absence of rewards. All responses to rewards and reward-predicting stimuli depend on event predictability. Dopamine neurons are activated by rewarding events that are better than predicted, remain uninfluenced by events that are as good as predicted, and are depressed by events that are worse than predicted.”

Predictive reward signal of dopamine neurons.

Schultz W. Institute of Physiology and Program in Neuroscience, University of Fribourg, CH-1700 Fribourg, Switzerland.

Abstract

….midbrain dopamine systems are involved in processing reward information and learning approach behavior.  Most dopamine neurons show: Continue reading

“…accumbens dopamine does not mediate primary food motivation or appetite, but is involved in appetitive and aversive motivational processes including behavioral activation, exertion of effort, approach behavior, sustained task engagement, Pavlovian processes, and instrumental learning. In this review, we discuss the complex roles of dopamine in behavioral functions related to motivation.”

Standard
Aside

When a person takes an addictive substance — whether it be in pill, syringe, or cigarette form — chemicals travel through the blood stream into the brain, where they act on key regions. Each of these drugs provides an artificial chemical boost to the body’s reward system. Continue reading

Emotions – Joe LeDoux’s Latest Model

Standard

Great presentation suggesting:

  • Natural language higher order concepts like emotions, choice, value, decisions, rewards, etc may not only be useful but actually lead to false ideas and unproductive research
  • He is proposing to replace emotions with a focus on “survival circuits”

Dopamine – The Neuortransmitter that Makes Us Do Dopey Things!!

Standard

Understanding Addiction

One of the neurotransmitters playing a major role in addiction is dopamine. Many of the concepts that apply to dopamine apply to other neurotransmitters as well.As a chemical messenger, dopamine is similar to adrenaline. Dopamine affects brain processes that control movement, emotional response, and ability to experience pleasure and pain. Continue reading