By Mohamed Ghilan, UVic Neuroscience


It is now recognized in neuroscience that the brain is malleable. It changes with our experience and forms pathways and connections that correlate with what we watch, listen to, and learn. From the active engagement in a philosophical discussion in class to the learning of directions in the new city you moved into; even the seemingly passive sitting down to listen to music or watch television results in a constant formation of new connections in the brain that eventually make us who we are as individuals. A huge problem, albeit a silent one, that has reached epidemic proportions is the viewing of pornography, which affects men more so than it does women.

The great majority of articles on the problematic nature of this subject typically speak about it from a psychological and/or social perspective. This article, however, will shed light on the effects of viewing pornography from a neuroscience perspective.

The current model explaining how we learn and remember things at the brain level uses synaptic plasticity as the basis. Synaptic plasticity is the ability of the brain to change the strength in connections between the neurons (brain cells) in response to experience. This involves changing the amount and types of receptors expressed, as well as the amount of neurot***smitters (communication molecules) being released.

A vital neurot***smitter in the brain is dopamine. It has many important roles that it serves in functions such as voluntary movement, motivation, reward, punishment, and learning. Dopamine has been implicated in children with ADHD, cognitive decline due to aging, and depression. Most of the public’s knowledge about dopamine is about famous individuals with Parkinson’s disease such as Muhammad Ali and Michael J Fox, who have dopamine dysfunction pathology.

A vital role for dopamine is in pleasure experience, reward, and learning. Drugs such as cocaine target the dopaminergic system to release great amounts of dopamine which results in experiencing a “high,” often leading to addiction. A number of studies have implicated dopamine in either the anticipation or the direct experience of pleasure. Depending on the brain area, dopamine can be released either prior to or during the moments of heightened pleasure. When released, dopamine strengthens and reinforces the new connections that are being made in the brain while an activity is undertaken. This in turn acts to encourage the individual to repeat the activity again so they can feel that pleasure once more.

How is this relevant to pornography? As the images are displayed on the screen, an arousal takes place and the dopaminergic system is triggered just like it would be by drugs such as cocaine. The newly formed connections in the brain from watching pornographic images become greatly reinforced by the massive amounts of dopamine being released. Rather than going into short term memory, where these images can be forgotten after the screen is turned off, the dopamine reinforcement ensures they’re moved into the long-term memory stores where they can be stuck in replay mode in the person’s mind. The troublesome fact about this is that the more something is recalled, the more it solidifies it in the brain. Think back to your school days when you studied for an exam – you repeated the statements you needed to memorize over and over until they stuck.