Is there an alternative to free will? Movement, in the final analysis, comes only from muscle contraction. Muscle contraction is under the complete control of the alpha motoneurons in the spinal cord.
When the alpha motoneurons are active, there will be movement. Activity of the alpha motoneurons is a product of the different synaptic events on their dendrites and cell bodies. There is a complex summation of EPSPs and IPSPs, and when the threshold for an action potential is crossed, the cell fires.
There are a large number of important inputs, and one of the most important is from the corticospinal tract which conveys a large part of the cortical control. Such a situation likely holds also for the motor cortex and the cells of origin of the corticospinal tract. Their firing depends on their synaptic inputs. And, a similar situation must hold for all the principal regions giving input to the motor cortex. For any cortical region, its activity will depend on its synaptic inputs. Some motor cortical inputs come via only a few synapses from sensory cortices, and such influences on motor output are clear.
Some inputs will come from regions, such as the limbic areas, many synapses away from both primary sensory and motor cortices. At any one time, the activity of the motor cortex, and its commands to the spinal cord, will reflect virtually all the activity in the entire brain. Is it necessary that there be anything else? This can be a complete description of the process of movement selection, and even if there is something more -- like free will -- it would have to operate through such neuronal mechanisms.
The view that there is no such thing as free will as an inner causal agent has been advocated by a number of philosophers, scientists, and neurologists including Ryle, Adrian, Skinner and Fisher.(Fisher 1993)''
