AO3

• 100% genetic determinism is unlikely to be found for any behaviour. = Studies that compare monozygotic twins have found 80% similarity for intelligence and 40% for depression. This suggests that genes do not entirely determine behaviour and supports an interactionist standpoint. The fact that concordance rates for MZ twins are often higher than for siblings, despite both sharing 50% of genes, may be due to MZ twins being more likely to share the same environment.
• Illusion of free will — A person may choose to do something but these choices are determined by previous reinforcement contingencies, as suggested by the behaviourist approach. This is a hard deterministic stance.
• Free will has good face validity — In everyday scenarios, we appear to be making our own decisions. Therefore, the idea of free will has good face validity because we appear to have free will in our day to day lives.