This section looks at motor programmes and their subroutines, the 3 levels of Adams loop control theory as well as an in depth look at Schmidt's Schema Theory.
Motor Programme: A series of subroutines organized into the correct sequence to perform a movement. Stored in the long term memory, retrieved when we need to perform the skill.
For example: The motor programme for a cricket shot stores the subroutines in the correct order (stance, grip, feet placement, backswing and follow through).
Motor programmes are the way in which our brains control our movements. There are two theories concerning this topic:
Open Loop Theory (Level 1 control)
This theory states the following:
- Decisions are made in the brain before performing the skill
- All information for one movement is sent in a single message
- The message is received by the muscles which perform the movement
- Feedback may or may not be available but it doesn't control the action
This theory accounts well for fast continuous ballistic movements (e.g. a golf swing), as there is little time to react or change your movement. It does not work so well for slower movements which may involve reactions and repositioning (such as a gymnast on the balance beam).
Closed Loop Theory
On the other hand, this theory explains slow movements well but not fast movements.
- Decisions are made in the brain
- Not all of the information is sent together
- Information is received by the muscles to initiate the movement
- Feedback is always available and is vital to correct movement patterns and adjust to changing needs
Once the motor programme to be performed has been selected, the movement has to be regulated and adapted. The open and closed loop theory suggest we control the movement on 3 different levels, depending on the extent to which the central nervous system is involved.
Level 2 will be small adjustments whilst undertaking the skill so feedback will be via the muscles. Level 3 control will require a cognitive pocess and so feedback is therefore via the brain. Level 3 will take slightly more time than Level 2.
Schema: All of the information needed to make a movement decision. It is stored in the brain as a long-term memory.
The schema theory challenges the open and closed loop theories and was developed by Schmidt in 1977. He suggested that motor programmes can be clustered and are changeable to respond to the situation. He also stated that the larger the motor programme that is achieved through practice, the easier it can be adapted to new situations. For example, during a tennis match, the performer cannot possibly have experienced every type of shot that they have to face, but they adapt the required stroke to suit the specific situation based on previous experience
This occurs before a movement is initiated and includes the following information which the performer must know to form a schema:
- Where is the: Goal; Opposition; Team mates
- What is the environment like?: Grass; Astro turf; Wet or dry; Wind
- What condition am I in?: Fresh; Tired; Injured
- How fast do I need to go?
- Where do I pass the ball to?
- How hard do I need to kick the ball?
- Which techniques will produce the best results?
This occurs either during or after the performance of a skill. In order to correct or alter a response, the athlete needs to know:
Movement/ Response Outcomes:
From knowledge of results (KR): Success / Failure
The end result and a comparison being made with the intended outcome. This updates the memory store for future reference when confronted with a similar situation in the future.
From knowledge of performance (KP): How did it look (extrinsic feedback) / how did it feel (intrinsic feedback)
The feelings experienced during & after the movement, The sound, the kinaesthetic feeling and any other information received via the sensory system. This then allows suitable adjustments to be made.