Principles of Motor Learning: A Comprehensive Guide

Introduction

The principles of motor learning (PML) are evidence-based strategies that explain how the human brain acquires new motor skills or plans. Understanding these principles is crucial for optimizing therapeutic interventions, particularly in fields like speech-language pathology and pediatric therapy. Motor learning is defined as the "acquisition of new skills with practice," reflecting a relatively permanent change in behavior. This article delves into the key principles of motor learning, exploring their application in various therapeutic contexts.

Defining Motor Learning

Motor learning involves acquiring skills through practice, not through neural maturation, passively imposed movements, or the integration of primitive reflexes. It's a set of processes associated with experience that leads to relatively permanent changes in the capability for movement.

Key Characteristics

Acquisition of Skills: Motor learning results in a lasting change in behavior rather than a temporary one.
Skills-Based: It focuses on acquiring functional skills, not just isolated movement patterns.
Practice-Driven: Skills are learned through repeated practice and problem-solving.

The Importance of Practice

Practice is the cornerstone of motor learning. To be effective, practice trials usually need to be repeated many times. The process of problem-solving needs to be repeated for effective learning, rather than simply the repetition of a movement.

Maximizing Practice

In structuring a practice session, the number of practice attempts should be maximized. Increased practice leads to increased learning. The amount of practice directly determines learning.

Practice in Rehabilitation

Failure of rehabilitation may be due to too little time spent practicing motor tasks. Increased practice of a task enhances learning and skill acquisition.

Read also: Adult Learning Principles

Practice Conditions

Practice conditions refer to what the patient does during intervention.

Amount of Practice

Aiming for about 100 accurate trials per session is a great goal. Different research studies recommend a variety numbers but, in general, 50 trials is the MINIMUM per session.

Massed vs. Distributed Practice

Research suggests that frequent, shorter sessions spread out over time are more effective for progress and generalization. Starting with massed practice (practicing all at once- think one session weekly for a longer time period) to build a strong foundation, then transitioning to distributed practice (therapy spread out across sessions- think 4, half hour sessions weekly). In massed practice, larger amounts of time are spent in practice with shorter breaks in between. In distributed practice, smaller chunks of practice occur and are offset by more frequent breaks. In early learning, massed practice may be more beneficial for improved performance, but for greater retention and long-term carryover, distributed practice is often preferred as movements become more efficient.

Blocked vs. Random Practice

Blocked practice is practicing one target extensively before moving on, then later randomizing practice by mixing several targets together. For severe cases, more blocked practice might be necessary, but you can modify it by mixing targets within blocks. During blocked practice, a skill is rehearsed repeatedly. Random practice involves engaging multiple skills in a random order. Blocked practice can be helpful during early learning. Randomized practice more closely replicates the way in which functional tasks are completed in activities of daily living. In early therapy, blocked practice is ideal. This means you practice the same target in a “block” of high trials. As time goes on and you work toward generalizing the new sound to other contexts, randomized practice is best.

Varying Contexts and Prosody

Facilitate practice in different contexts. Vary the types of consonants or vowels and the positions that they are in. Increase complexity of movements as the child gains the accurate motor movement sequences. Experiment with prosody, loudness, and emotional intonation.

Whole vs. Part Practice

Activities can be practiced in their entirety (whole practice) or broken down into parts (part practice). When a patient is in the cognitive stage of motor learning, part practice may be more beneficial. Whole practice is usually preferred as the patient progresses.

Feedback Conditions

Feedback conditions refer to what the therapist does during intervention. The feedback we provide students in articulation therapy changes as therapy goes on.

Types of Feedback

Extrinsic feedback can be knowledge of results (was that right or wrong) or knowledge of performance (specific guidance on what specifically needs improvement).

Knowledge of Results (KR): Binary feedback indicating whether the outcome was right or wrong. Responses such as "You got it!" or "That wasn't quite right" would fall in this category.
Knowledge of Performance (KP): Detailed, descriptive feedback providing specific guidance on what needs improvement. "Your tongue needs to move slightly forward, back etc."

Frequency and Specificity of Feedback

In early therapy, feedback should be specific and frequent (or immediate). As time goes on feedback should change. We work our way to less frequent (or delayed) and more general feedback to increase independents.Initially, provide more feedback to guide the child, but gradually fade it as they become more accurate and independent in their speech movements. We don’t want too much support for too long otherwise the child could become dependent on the supports. We want to fade supports so children know how to produce the movements independently.

Self-Evaluation

Self-evaluation is a key to success in any sort of therapy for speech sound disorders. Start working on the skill of self-awareness and self-evaluation from the very first therapy session. Train those ears to be able to HEAR when the sound is correct. This plays in perfectly with self-evaluation.

Read also: Syllabus Outline for CSP Educators

Application in Speech Therapy

Principles of Motor Learning (PMLs) refers to patterns of learning that have emerged from research into human movement. PMLs are increasingly being investigated as they apply to speech therapy in the hopes that a solid understanding of PMLs can help Speech-Language Pathologists optimize their work with patients/clients struggling with motor speech challenges, such as Childhood Apraxia of Speech. The traditional or motor-based approaches utilized to treat speech sound disorders specifically focus on the motor aspects of sound production. The traditional approach emphasizes teaching the placement of the articulators and the motor movement patterns needed for speech sound production. Therefore, speech sound production is a motor-based skill.

Target Selection

Target selection is something else to consider for your speech therapy sessions. Of course, we can work up the articulation hierarchy by practicing syllables, then monosyllabic words, then multisyllabic words, then phrases, then sentences, then conversation. We can also consider facilitative contexts and look at what words, in terms of the movement of the tongue and demands on the articulators, are least to most complex.

Application in Pediatric Therapy

The field of motor learning has tremendous implications for pediatric therapy. Since one of the primary aims of therapy is the acquisition of the functional motor skills, the study of motor learning should help to guide our interventions. Among children with severe disabilities, simple functional motor abilities that most of us take for granted are often lacking. I suggest that many of these children would benefit from more opportunities to practice their motor skills. Factors affecting motor learning in this population include the inability to practice many motor skills without assistance or physical support, and slower rates of learning. One of the biggest benefits of the MOVE curriculum is that it gives a structured way for practice of mobility tasks to be incorporated consistently throughout the day.

Application in Stroke Rehabilitation

To provide a just right level of distraction for patients needs and their stage of motor learning, sessions can be scheduled according to the patient's needs. Activities can also be modified. With the patient seated at the table, items needed for our activity could be placed to elicit visual scanning in the peripersonal space, creates variable reaching distances, and requires trunk movement in the sagittal and transverse planes. Activities can be practiced in their entirety (whole practice) or broken down into parts (part practice). During our session, patients can engage in distributed practice, taking breaks after sizing and cutting the wrapping paper as well as after ripping off strips of tape and placing them on the edge of the table for later use. For certain steps based on difficulty with some of the fine motor tasks required, blocked practice can be used.

Stages of Motor Learning

A learned motor skill results from two different levels of performance that are demonstrated during the acquisition and learning phase and the retention and transfer phase. During the acquisition and learning phase, motor performance is demonstrated through the establishment of the ability to execute a specific motor skill. This perspective emphasizes that acquisition is the product of practice. Retention and transfer reflect the level of learning that is considered the permanent change in the ability to demonstrate the skilled movements as measured by retention of the skill after the training and practice have been completed. The level of performance during the practice phase of motor learning does not predict retention and transfer of the skill

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