In one study, participants' approach bias for alcohol was measured both before and after an intervention. The intervention involved asking alcoholics in recovery to use a joystick to either pull pictures towards themselves or to push them away. Four different groups were assigned to four different levels of intervention, with two being experimental groups and two acting as control groups.
The first experimental group was directly told to push the joystick away when an image of alcohol came on the screen and to pull the joystick when a soft drink was displayed. All images were exactly square.
The second experimental group was told to push the joystick for pictures in landscape format (horizontal) and to pull the joystick for pictures in portrait format (vertical). Most of the images of alcohol appeared in landscape format, whereas most pictures of soft drinks appeared in portrait format. However, participants were not told about the alcohol versus soft drink distinction and were merely told to react based on the layout orientation of the picture on the screen.
The results of the study showed that for both experimental groups, alcohol approach bias was changed to a strong avoidance bias immediately after the intervention. The control groups, on the only hand, averaged only a mild decrease in approach bias. Note that this was equally true in the case of individuals in the second experimental group, who were unaware that they were specifically pushing images of alcohol or that the exercise was meant to affect alcohol preferences in the first place. Furthermore, in a one-year follow-up, fewer of the experimental group participants had alcoholism relapses than the control group participants.
On the downside, the experimental groups ended up showing an increased approach bias for soft drinks!
A similar study was conducted among high-drinking students, who then taste-tested alcoholic and soft drink beverages after engaging in the joystick/image exercises. This study showed that those who had been assigned to unconsciously push away the images of alcohol and who also showed a change in their Approach Avoidance Test score, ended up drinking one full glass of beer less during the taste-testing time than those whose Approach Avoidance Test scores had not changed significantly.
While these studies certainly raise some ethical concerns about unconscious brain manipulation, they also have the potential to affect addiction treatments.
In addition to the health intervention reasons why these studies are interesting, I also found them interesting from a marketing perspective. Surely many companies who want to sell me something are also aware of the power of implicit associations and use these to their advantage. It has definitely got me wondering how my implicit preferences affect my food decisions and other consumer choices. In fact, some firms even use neuro-marketing to create the most compelling advertisements. These firms pay people to view advertisements while having their brain activity monitored, in order to predict whether the ads are likely to affect consumer preferences and behavior.....more on that in a later post!
What do you think of the joystick activity as a potential alcohol intervention? What potential benefits or downsides seem most relevant or important to you?