Motor Skill Classification: Open/Closed, Gross/Fine, and Discrete/Serial/Continuous (Lecture Notes)
Overview of motor skill classification
Purpose of group work: Friday and possibly Monday; students will practice classification in groups and present to the class to reveal thought processes behind classification.
Open acknowledgment: classification is not always black-and-white; there is variation and nuance; debates are encouraged to understand different valid perspectives.
Practical goal: groups should identify the actual goal of movement in addition to classifying the skill; be prepared to defend a classification or discuss alternatives.
Real-world relevance: classifications help in teaching, feedback, practice design, and environment setup (especially in PE, therapy, athletics).
Method 1: Open vs. Closed (environment-driven classification)
Core idea: classify movement based on the environment around the movement (the surrounding context), not just musculature or precision.
Open skill: performed in a variable, unpredictable environment; environment can change and influence the movement.
Examples mentioned: wrestling (movement largely dictated by the opponent), walking through a crowded area (navigate others), many team sports with variable teammates’ actions.
Note: darts was discussed as a potential example to revisit; its open/closed status can be debated.
Closed skill: movement occurs in a stable, predictable environment; nothing around the movement is expected to disrupt it.
Examples: shooting a rifle on a range (targeting is precise in a controlled setting), chess (movement is picking and moving a piece in a stable environment with no outside disturbance).
The space-around-the-body concept: a practical way to assess openness; if the space around the movement can easily change, the skill is more open; if it remains stable, it's more closed.
Semi-open/semi-closed (intermediate) scenarios exist: some movements fall between fully open and fully closed depending on context (e.g., steering a car, walking in a semi-predictable environment with occasional external factors).
Notable teaching point: the classification shifts with context; drivers may be technically closed in one sense (the motor action of steering is a localized skill) but the surrounding environment (traffic, weather) can make it more open.
Decision tool: place a skill on a continuum from completely open to completely closed, with some skills in the middle depending on context. Visualize with a continuum: open <-> middle <-> closed.
Special cases discussed:
Gymnastics routines (balance beam, floor) are typically treated as closed because the environment around the gymnast is tightly controlled, though some debate exists.
Video game environments can create unpredictable elements; discussion planned for Friday.
Practical takeaway for teaching/therapy: environment design matters; consider whether the learner will face open or closed contexts and tailor practice and feedback accordingly.
Method 2: Gross vs. Fine motor skills (musculature and precision emphasis)
Core idea: classify movement by how much muscle activation is required and how much precision is needed.
Gross motor skill: involves a large amount of musculature; precision is less critical than the sheer activation and coordination of large muscle groups.
Example discussions: swinging a baseball bat (generally gross motor with some precision but dominated by whole-body effort).
Additional example exploration: kicking a field goal in football—requires significant whole-body activation; precision is needed, but the movement is still largely gross in its musculature.
Fine motor skill: involves using a limited amount of musculature with a focus on precision and accuracy.
Examples highlighted: typing, writing, texting on a phone, manipulating a clicker.
Important nuance: even if a movement includes precision, it does not automatically make it a fine motor skill; the extent of musculature involved is also a key factor.
Summary rule: determine whether you could be precise without a significant amount of musculature (likely fine) or whether substantial musculature is required (likely gross).
Practical examples discussed:
Hitting a baseball with a bat is generally gross motor with precision demands; still often considered gross in broad classification.
Writing and typing are typically fine motor due to precision with limited musculature.
Teaching implication: when classifying a skill, consider both the muscle activation and the precision requirements to determine whether it is gross or fine.
Method 3: The Task Perspective continuum (open/closed interactions integrated with skill type)
This method complements the previous two by focusing on how the task is organized rather than just environment or musculature.
The continuum concept: some skills are more discrete, serial, or continuous, and many lie along a spectrum rather than at fixed points.
Discrete skill: clear beginning and end, brief duration (typically seconds).
Examples: rifle shooting (trigger action has a clear start and end), throwing a dart, a deadlift (clear initiation and completion).
Continuous skill: ongoing movement with a start and end that are not easily defined; duration can be minutes to hours; repetitive nature.
Examples: walking, running, swimming, cycling; these are cardiovascular-like, repetitive motions that continue until a goal is reached.
Serial skill: a sequence of discrete skills joined in a specific order; the order is essential to success.
Examples: dance (ballroom dances require learning steps in sequence), gymnastics floor routines (specific sequence of elements), synchronized activities where multiple discrete segments are ordered to produce the final performance.
In some discussions, writing can be viewed as serial because letters must follow a specific order to convey meaning; if letters are random, it could become more continuous or undefined.
Interpreting ambiguous cases: many movements can be argued as discrete, serial, or continuous depending on perspective (e.g., box jumping can be considered discrete (a single explosive action) or serial (a sequence of component actions to complete the jump)). The key is to analyze the necessary order and time characteristics.
Practical examples mentioned:
Plyometrics box jumps: debate whether they are discrete (single explosive action) or serial (involves a prep and execution sequence); the instructor initially labeled it discrete, later considered serial due to necessary preparatory movements.
Assembly-line tasks (implied): often serial because of ordered component actions that collectively produce a final product.
Confusions and clarifications:
Skills can be described with all three classifications (discrete, serial, continuous) depending on how we frame the movement; these categories are not mutually exclusive.
Visualizing the framework: imagine placing skills on a spectrum from discrete to continuous with serial interposed as a combination of discrete elements in a defined order.
Examples and clarifications from the transcript
Examples used to illustrate open vs closed:
Open: walking in a crowded area; wrestling (movement determined by the other person); general open scenario with variable external influences.
Closed: shooting a rifle on a range; chess; driving a car (movement around the steering wheel is stable; the surrounding traffic is variable, but the motor action itself is controlled by the driver); boxing or other controlled drills mentioned as generally closed when environment is stable.
Examples illustrating the environment’s influence on movement:
If the environment changes (e.g., Niagara Falls wind), a closed skill can become more open in practice due to external disturbances.
Gymnastics on a stable floor might be treated as closed, but an unpredictable other person on the mat turned a closed environment into an open risk example.
Conceptual takeaway for professionals:
In physical therapy, consider environmental factors when rehabbing; home or living environment differences (stairs, independence) can influence when a patient is ready for discharge.
The environment should guide how to teach, practice, and arrange tasks; emphasis on moving beyond the movement to include context and required conditions for success.
Key meta-point: learners should be able to analyze movement using the three frameworks (gross/fine, open/closed, discrete/serial/continuous) to inform teaching strategies, feedback, and practice design.
Practical takeaways for your Friday group work
You will be given skills and asked to classify them using all three frameworks (gross/fine, open/closed, and discrete/serial/continuous).
You should be prepared to discuss potential alternative classifications and justify why a skill could reasonably fit multiple categories depending on context.
You’ll be asked to consider not just the movement itself but the environment, the goal of movement, and the sequence of actions when appropriate.
Remember: classifications are tools to guide teaching, feedback, practice structure, and environment design; they are not strict labels that can’t be debated.
Summary takeaways
There are three primary lenses to classify motor skills:
Gross vs. Fine motor skills: based on muscle activation and precision demands.
Open vs. Closed skills: based on environmental variability and how it affects movement.
Discrete vs. Serial vs. Continuous: based on the movement’s temporal structure and sequencing.
Each lens provides useful insights, and most real-world movements can be analyzed through multiple lenses depending on context.
The environment, goals, and the learner’s context are crucial for accurate classification and effective teaching/therapy planning.
The classification process is inherently nuanced and sometimes subjective, which is why group discussion and defending multiple viewpoints are valuable.