During the first few years of life, the brain undergoes a period of extensive neural growth known as blooming. This phase is characterized by the rapid formation of a vast number of neural connections and pathways, laying the foundational circuitry for future learning and development.

Neural Blooming in Early Childhood

Analyze the developmental change described in the case study below. Explain the two key processes that are likely occurring to produce this outcome and describe the overall purpose of this refinement.

Neural Refinement in Language Acquisition

A common belief is that a brain with more connections between neurons is always better or more efficient. Based on your understanding of how neural circuits are refined during development, evaluate this statement. Is it accurate? Justify your reasoning by describing the key processes involved in this refinement.

Efficiency of Neural Circuits

Synapse rearrangement is a critical process in brain development where neural circuits are refined. This process involves two main phases: a period of rapid synapse formation, known as blooming, followed by a period of synapse reduction, or pruning. This dynamic reshaping helps optimize brain function.

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There are chemical and structural phenomena that contribute to the development of synapses. Two examples of chemical and structural phenomena are the following: 

-Growth cones are swellings at the tips of axons off which thin, threadlike fibers called filopodia extend. The filopodia of these growth cones can latch onto cellular adhesion molecules (CAMs) , and then contract move the neuron in the direction of the CAM (and, presumably, the location of the postsynaptic cell). Growth cones can also facilitate movement of dendrites, and thereby plasticity, in adults.  

-Chemoattractants and chemorepellents are chemical signals that either attract or repel axonal growth cones, respectively. Gradients of these signaling molecules affect the distribution of neurons during the development of the nervous system. 

Mechanisms of Synaptogensis

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

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