Motor skill
A motor skill is a learned ability to cause a predetermined movement outcome with maximum certainty. Motor learning is the relatively permanent change in the ability to perform a skill as a result of practice or experience. Performance is an act of executing a motor skill. The goal of motor skill is to optimize the ability to perform the skill at the rate of success, precision, and to reduce the energy consumption required for performance. Continuous practice of a specific motor skill will result in a greatly improved performance, but not all movements are motor skills.
Types of motor skills
Motor skills are movements and actions of the muscles. Typically, they are categorized into eighteen groups:- Gross motor skills – require the use of large muscle groups to perform tasks like walking, balancing, and crawling. The skill required is not extensive and therefore are usually associated with continuous tasks. Much of the development of these skills occurs during early childhood. The performance level of gross motor skill remains unchanged after periods of non-use. Gross motor skills can be further divided into two subgroups: locomotor skills, such as running, jumping, sliding, and swimming; and object-control skills such as throwing, catching and kicking.
- Fine motor skills – requires the use of smaller muscle groups to perform smaller movements with the wrists, hands, fingers, and the feet and toes. These tasks that are precise in nature, like playing the piano, writing carefully, and blinking. Generally, there is a retention loss of fine motor skills over a period of non-use. Discrete tasks usually require more fine motor skill than gross motor skills. Fine motor skills can become impaired. Some reasons for impairment could be injury, illness, stroke, congenital deformities, cerebral palsy, and developmental disabilities. Problems with the brain, spinal cord, peripheral nerves, muscles, or joints can also have an effect on fine motor skills, and decrease control.
Development
- Cephalocaudal – development from head to foot. The head develops earlier than the hand. Similarly, hand coordination develops before the coordination of the legs and feet. For example, an infant is able to follow something with their eyes before they can touch or grab it.
- Proximodistal – movement of limbs that are closer to the body develop before the parts that are further away, such as a baby learns to control the upper arm before the hands or fingers. Fine movements of the fingers are the last to develop in the body.
- Gross to specific – a pattern in which larger muscle movements develop before finer movements. For example, a child only being able to pick up large objects, to then picking up an object that is small between the thumb and fingers. The earlier movements involve larger groups of muscles, but as the child grows finer movements become possible and specific things can be achieved.
There are six aspects of development:
- Qualitative – changes in movement-process results in changes in movement-outcome.
- Sequential – certain motor patterns precede others.
- Cumulative – current movements are built on previous ones.
- Directional – cephalocaudal or proximodistal
- Multifactorial – numerous-factors impact
- Individual – dependent on each person
Components of development
- Growth – increase in the size of the body or its parts as the individual progresses toward maturity
- Maturation – refers to qualitative changes that enable one to progress to higher levels of functioning; it is primarily innate
- Experience or learning – refers to factors within the environment that may alter or modify the appearance of various developmental characteristics through the process of learning
- Adaptation – refers to the complex interplay or interaction between forces within the individual and the environment
Influences on development
- Stress and arousal – stress and anxiety is the result of an imbalance between demand and the capacity of the individual. In this context, arousal defines the amount of interest in the skill. The optimal performance level is moderate stress or arousal. An example of an insufficient arousal state is an overqualified worker performing repetitive jobs. An example of excessive stress level is an anxious pianist at a recital. The "Practice-Specificity-Based Model of Arousal" holds that, for best and peak performances to occur, motor task performers need only to create an arousal level similar to the one they have experienced throughout training sessions. For peak performance, performers do not need to have high or low arousal levels. It is important that they create the same level of arousal throughout training sessions and competition. In other words, high levels of arousal can be beneficial if athletes experience such heightened levels of arousal during some consecutive training sessions. Similarly, low levels of arousal can be beneficial if athletes experience such low levels of arousal during some consecutive training sessions.
- Fatigue – the deterioration of performance when a stressful task is continued for a long time, similar to the muscular fatigue experienced when exercising rapidly or over a long period. Fatigue is caused by over-arousal. Fatigue impacts an individual in many ways: perceptual changes in which visual acuity or awareness drops, slowing of performance, irregularity of timing, and disorganization of performance.
- Vigilance – the effect of the loss of vigilance is the same as fatigue, but is instead caused by a lack of arousal. Some tasks include actions that require little work and high attention.
- Gender – gender plays an important role in the development of the child. Girls are more likely to be seen performing fine stationary visual motor-skills, whereas boys predominantly exercise object-manipulation skills. While researching motor development in preschool-aged children, girls were more likely to be seen performing skills such as skipping, hopping, or skills with the use of hands only. Boys were seen to perform gross skills such as kicking or throwing a ball or swinging a bat. There are gender-specific differences in qualitative throwing performance, but not necessarily in quantitative throwing performance. Male and female athletes demonstrated similar movement patterns in humerus and forearm actions but differed in trunk, stepping, and backswing actions.
Stages of motor learning
The stages of motor learning are the cognitive phase, the associative phase, and the autonomous phase.
- Cognitive phase – When a learner is new to a specific task, the primary thought process starts with, "What needs to be done?" Considerable cognitive activity is required so that the learner can determine appropriate strategies to adequately reflect the desired goal. Good strategies are retained and inefficient strategies are discarded. The performance is greatly improved in a short amount of time.
- Associative phase – The learner has determined the most-effective way to do the task and starts to make subtle adjustments in performance. Improvements are more gradual and movements become more consistent. This phase can last for a long time. The skills in this phase are fluent, efficient, and aesthetically pleasing.
- Autonomous phase – This phase may take several months to years to reach. The phase is dubbed "autonomous" because the performer can now "automatically" complete the task without having to pay any attention to performing it. Examples include walking and talking or sight reading while doing simple arithmetic.
Law of effect
Feedback
During the learning process of a motor skill, feedback is the positive or negative response that tells the learner how well the task was completed.Inherent feedback: after completing the skill, inherent feedback is the sensory information that tells the learner how well the task was completed. A basketball player will note that he or she made a mistake when the ball misses the hoop. Another example is a diver knowing that a mistake was made when the entry into the water is painful and undesirable.
Augmented feedback: in contrast to inherent feedback, augmented feedback is information that supplements or "augments" the inherent feedback. For example, when a person is driving over a speed limit and is pulled over by the police. Although the car did not do any harm, the policeman gives augmented feedback to the driver in order for him to drive more safely. Another example is a private tutor for a new student in a field of study. Augmented feedback decreases the amount of time to master the motor skill and increases the performance level of the prospect.
Transfer of motor skills: the gain or loss in the capability for performance in one task as a result of practice and experience on some other task. An example would be the comparison of initial skill of a tennis player and non-tennis player when playing table tennis for the first time. An example of a negative transfer is if it takes longer for a typist to adjust to a randomly assigned letter of the keyboard compared to a new typist.
Retention: the performance level of a particular skill after a period of no use.
The type of task can have an effect on how well the motor skill is retained after a period of non-use:
- Continuous tasks – activities like swimming, bicycling, or running; the performance level retains proficiency even after years of non-use.
- Discrete tasks – an instrument, video game, or a sport; the performance level drops significantly but will be better than a new learner. The relationship between the two tasks is that continuous tasks usually use gross motor skills and discrete tasks use fine motor skills.
Brain structures
The supplemental motor area, which is just anterior to the primary motor cortex, is involved with postural stability and adjustment as well as coordinating sequences of movement. The premotor cortex, which is just below the supplemental motor area, integrates sensory information from the posterior parietal cortex and is involved with the sensory-guided planning of movement and begins the programming of movement.
The basal ganglia are an area of the brain where gender differences in brain physiology is evident. The basal ganglia are a group of nuclei in the brain that is responsible for a variety of functions, some of which include movement. The globus pallidus and putamen are two nuclei of the basal ganglia which are both involved in motor skills. The globus pallidus is involved with the voluntary motor movement, while the putamen is involved with motor learning. Even after controlling for the naturally larger volume of the male brain, it was found that males have a larger volume of both the globus pallidus and putamen.
The cerebellum is an additional area of the brain important for motor skills. The cerebellum controls fine motor skills as well as balance and coordination. Although women tend to have better fine motor skills, the cerebellum has a larger volume in males than in females, even after correcting for the fact that males naturally have a larger brain volume.
Hormones are an additional factor that contributes to gender differences in motor skill. For instance, women perform better on manual dexterity tasks during times of high estradiol and progesterone levels, as opposed to when these hormones are low such as during menstruation.
An evolutionary perspective is sometimes drawn upon to explain how gender differences in motor skills may have developed, although this approach is controversial. For instance, it has been suggested that men were the hunters and provided food for the family, while women stayed at home taking care of the children and doing domestic work. Some theories of human development suggest that men's tasks involved gross motor skill such as chasing after prey, throwing spears and fighting. Women, on the other hand, used their fine motor skills the most in order to handle domestic tools and accomplish other tasks that required fine motor-control.