Lecture 19: Motor System, 1

TL;DR

Spinal reflexes involve multiple synapses and can be triggered by intense stimuli or novelty. Competitive growth influences the development of axons.

Transcript

GERALD SCHNEIDER: And here in the front that asked me whether a bird's song would count as a fixed action pattern-- doesn't sound fixed. This is because they learn a lot. But you know that's true for every fixed action pattern, every instinctive behavior. There's always some learning involved. It's never fully formed. Walking is a fixed action patt... Read More

Key Insights

• ❓ Spinal reflexes involve multiple synapses and can be triggered by intense stimuli or novelty.
• 🖐️ Competition among axons plays a crucial role in the development of neural pathways.
• 🧑‍🏭 Growth vigor of axons can be modulated by intrinsic and extrinsic factors.

Questions & Answers

Q: Are spinal reflexes monosynaptic?

No, spinal reflexes involve multiple synapses between sensory input and motor output.

Q: What is the role of competition in neural development?

Competition among axons helps to sort out and establish specific connections, leading to the formation of neural pathways.

Q: How can the growth vigor of axons be modulated during development?

Growth vigor can be modulated by both intrinsic and extrinsic factors, such as chemical factors and interactions with the environment.

Q: How do intense stimuli and novelty affect spinal reflexes?

Intense stimuli can enhance the sensitivity of spinal reflexes, triggering a more pronounced response. Novelty can also increase sensitivity and induce curiosity or avoidance.

Summary & Key Takeaways

• Spinal reflexes are multi-synaptic and can be triggered by intense stimuli or novelty.

• Competition among axons plays a role in the development of neural pathways, causing them to sort out and form specific connections.

• Intrinsic factors and chemical factors can modulate the growth vigor of axons during development.