Chapter 3.3 : Moving and Grasping Early Motor Skills

Locomotion and the Dynamic Systems View

• Locomotion refers to how a baby or toddler moves around using gross motor skills and interacts with their environment.
• Gross motor skills: large muscle movements.
• Dynamic Systems Theory (DST) and locomotion:
  • Motor development involves many distinct skills that are organized and reorganized over time to meet specific task demands.
  • Example: a toddler may first learn to stand up and move to where they want to go; once there, they may perceive a new goal (e.g., to climb onto something or reach for something else). This illustrates how multiple systems (motor, sensory, cognition, environmental cues) work together to achieve a goal.
• Differentiation vs. Integration:
  • Differentiation = mastery of the component skill (learning the parts separately).
  • Integration = combining components into the sequence needed to accomplish the task, integrating multiple systems and environmental knowledge.
• Age of unsupported independent walking:
  • Occurs at about $12 \text{ to } 15 \text{ months}$, once children have mastered and coordinated the component skills.
• Cultural variations in gross motor development:
  • In some traditional African cultures, children receive training to sit and walk at younger ages than in Europe and North America.
  • Some Central Asian cultures may practice more swaddling; the transcript notes that pehaps more “swallowing” (likely referring to swaddling) could discourage motor development if a child is swaddled and cannot move.
• Gross motor vs. fine motor:
  • Gross motor:
  • Large muscle movements (e.g., walking, jumping, climbing).
  • Fine motor:
  • Small muscle movements involved in grasping, pinching, holding, and manipulating objects.

Fine Motor Milestones and Handedness

• Fine motor milestones:
  • At $4 \text{ months}$: infants reach for an object clumsily and may bat at items.
  • At $5 \text{ months}$: coordination of the two hands together to hold an object (bilateral coordination).
  • At $2 \text{ to } 3 \text{ years}$: children can use a zipper but not yet buttons.
  • At around $6 \text{ years}$: children typically tie their shoes.
• Handedness:
  • Handedness is the preference for using the right hand or the left hand.
  • It can be influenced by heredity, environment, and culture.
• Interactive reflection:
  • Pause here and think about handedness. Are you right-handed, left-handed, or ambidextrous?
  • If you are right-handed, how much have you thought about it? If you are left-handed, how has it impacted your daily life?
  • The speaker shares a personal note about a left-handed spouse and invites students to comment on their own handedness and experiences.

Summary and Connections

• Across part three of chapter three, the focus was on:
  • The component skills involved in learning to walk (gross motor foundations and the coordination of multiple systems).
  • The typical ages at which infants master these component skills and begin unsupported walking.
  • How infants develop the use of their hands (fine motor skills and handedness).
• The material connects to foundational principles of motor development: the dynamic interaction of multiple subsystems (motor, sensory, cognitive, environmental) and how differentiation and integration enable goal-directed action.
• Practical implications:
  • Cultural practices can influence the timing of motor skill emergence.
  • Swaddling or restricted movement practices may impact the natural emergence of motor milestones.
• Real-world relevance:
  • Understanding these milestones helps caregivers and educators set expectations, observe typical ranges, and recognize when to seek evaluation if milestones are delayed.

Connections to at-a-glance Concepts

• Gross motor skills define large movements; fine motor skills define precise object manipulation.
• DST emphasizes that motor development is not a linear step-by-step path but a dynamic reorganization of abilities to meet tasks.
• Distinguishing differentiation (mastering parts) from integration (assembling parts into a whole) clarifies how walking and other complex skills develop over time.
• Handedness arises from a mix of biological and environmental factors and remains a practical consideration in daily life and learning.