Editing Classical conditioning (section)

===Conditioned emotional response{{anchor|Conditioned emotional response}}===
{{Further|Conditioned emotional response|Fear conditioning}}
The influence of classical conditioning can be seen in emotional responses such as [[phobia]], [[disgust]], [[nausea]], anger, and [[sexual arousal]]. A common example is conditioned nausea, in which the CS is the sight or smell of a particular food that in the past has resulted in an unconditioned stomach upset. Similarly, when the CS is the sight of a dog and the US is the pain of being bitten, the result may be a conditioned fear of dogs. An example of conditioned emotional response is [[#Conditioned suppression|conditioned suppression]].

As an adaptive mechanism, emotional conditioning helps shield an individual from harm or prepare it for important biological events such as sexual activity. Thus, a stimulus that has occurred before sexual interaction comes to cause sexual arousal, which prepares the individual for sexual contact. For example, sexual arousal has been conditioned in human subjects by pairing a stimulus like a picture of a jar of pennies with views of an erotic film clip. Similar experiments involving blue [[gourami]] fish and [[domesticated quail]] have shown that such conditioning can increase the number of offspring. These results suggest that conditioning techniques might help to increase fertility rates in [[Infertility|infertile]] individuals and [[endangered species]].<ref>{{cite book |last=Carlson |first=Neil R.|name-list-style=vanc |title=Psychology: The Science of Behaviour |year=2010 |publisher=Pearson Education Inc. |location=New Jersey, United States |isbn=978-0-205-64524-4 |pages=[https://archive.org/details/psychologyscienc0004unse/page/198 198–203] |url=https://archive.org/details/psychologyscienc0004unse/page/198}}</ref>