Second Language Acquisition in Early Childhood

Some authors consider language acquisition a different from second language learning, based on the premise that the former is a natural process, similar to the first language acquisition process.
The presentation above describes the stages of the process. Second Language Acquisition

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Cognitive Development - Stage 4 - Formal Operational

During the Formal Operational stage children develop their capacity of deductive logic. This means that problem solving is not limited to concrete thinking (present objects). This video shows how children at this stage are able to engage in abstract thinking.

Piaget, J., Inhelder, B. (1969). The Psychology of the Child. Morata. París.

Characteristics of the Piagetian Stages of Cognitive Development

The Cognitive Developmental Stages of Piaget:

Tiffany Davis, Meghann Hummel, and Kay Sauers (2006)

Characteristics of each stage:

1. The sensorimotor stage (0 - 2 years)

Appearance of self-preservation instincts.

Assimilation of new information.

Development of sensori-motor reactions, reflexes and first schemata.

Perception of object permanence.

Problem solving by sudden mental operations.

2. Preoperational stage (2 - 7 years)

Egocentrism (children are unable to understand other than their own perceptions).

Perception of object conservation (objects change place without alteration of their physical properties of matter).

3. Concrete operational stage (7 - 11 years)

Problem solving involving concrete thinking (present objects).

Full development of perception of object permanence.

Development of inductive logic.

4. Formal operational stage (adolescence - adulthood)

Problem solving involving concrete and abstract thinking.

Development of deductive logic.

Piaget, J., Inhelder, B. (1969). La Psicología del Niño. Morata. París.

More about the Sensorimotor Stage (0 - 2 years)

This is a helpful link if you want to know more about the Sensorimotor Stage of cognitive development. This includes an audio and text description.

http://www.wadsworthmedia.com/psychology/now/developmental-LMs/sensorimotor_stage.html

Cognitive Development - Stage 3 - Concrete Operational

This video shows how the ability of conservation is completed. This occurs during the Concrete Operational stage. During this stage, children also develop their capacity of inductive logic, which refers to the ability to use their schemata and previous experiences for problem solving.

Piaget, J., Inhelder, B. (1969). The Psychology of the Child. Morata. París.

Cognitive Development - Stage 2 - Preoperational

The conservation task is part of the experiments developed to demonstrate the Piagetian stages of coginitive development. During the Preoperational stage children are not able to perceive conservation, which refers to object alteration of place or spatial organization (among others) without affecting quantity, volume, weight and other physical characteristics.

Piaget, J., Inhelder, B. (1969). The Psychology of the Child. Morata. París.