Assessment of brain laterality among Iranian addicts and smokers

Authors

Abstract

Previous research supported that the prevalence of addiction is related to brain laterality. Brain laterality is often determined by left/right handedness and this phenomenon is considered as an important factor in addiction prevalence. The present study attempts to examine the relationships between left/right handedness with addiction and smoking on Iranian population. In this study, 2000 male and female non-addicted (age 31±3 years old) and 1000 male and female addicted (age 42±4 years old) were examined for left/right handedness. The results showed that: right versa left handedness percentages for normal subjects were 91.3% to 8.7% respectively, while for the addict and smoker group were 79.3% to 20.7% respectively. These data indicated that the prevalence of addiction and smoking among left-handed subjects was very higher than right-handed group (P<0.001). In conclusion, it is clear that the risk of addiction is higher in left-handed individuals, which is consistent with previous studies.