# 14: Rate Models and Perceptrons - Intro to Neural Computation | Summary and Q&A

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June 29, 2020
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MIT OpenCourseWare
14: Rate Models and Perceptrons - Intro to Neural Computation

## TL;DR

This content introduces rate models and perceptrons as methods for studying and classifying neural networks.

## Key Insights

• ☠️ Rate models replace spike trains with firing rates, simplifying the mathematical description of neural networks.
• ⚾ Perceptrons are used to develop networks that can classify inputs based on a threshold.
• 😫 Matrix operations and basis sets are important tools in analyzing neural networks and high-dimensional datasets.
• ❓ Recurrent neural networks have dense recurrent connections and exhibit interesting computational abilities.
• ❓ Matrices and vector notation can be used for compact representation and analysis of neural networks.
• 🏋️ Learning in neural networks can be achieved by adjusting weights based on classification errors.
• 🏋️ The decision boundary of a perceptron can be determined by the weights and threshold.

## Transcript

MICHALE FEE: So for the next few lectures, we're going to be looking at developing methods of studying the computational properties of networks of neurons. This is the outline for the next few lectures. Today we are going to introduce a method of studying networks called a rate model where we basically replace spike trains with firing rates in orde... Read More

### Q: How do rate models differ from spike train models in studying neural networks?

Rate models replace spike trains with firing rates to simplify the mathematical description of neural networks, allowing for the development of intuitive understanding and analysis of network behavior.

### Q: What is the role of perceptrons in neural networks?

Perceptrons are used to develop networks that can classify inputs by determining whether the weighted sum of the input firing rates exceeds a threshold.

### Q: How are matrix operations and basis sets important in studying neural networks?

Matrix operations and basis sets are fundamental tools for analyzing neural networks as well as high-dimensional datasets, allowing for the reduction of dimensionality and analysis of complex data.

### Q: What are recurrent neural networks and what makes them interesting?

Recurrent neural networks are networks in which neurons connect to each other densely in a recurrent manner, creating interesting computational abilities such as line attractors and short-term memory.

## Summary & Key Takeaways

• The content introduces rate models as a way to study networks of neurons, using firing rates instead of spike trains.

• Perceptrons are introduced as a method for developing networks that can classify inputs.

• The content discusses the use of matrix operations and basis sets for studying neural networks, as well as reducing the dimensionality of high dimensional data sets using techniques like principal components analysis.

• Recurrent neural networks are mentioned as networks where neurons connect to each other in a recurrent manner, and their computational abilities are explored in the context of line attractors and short-term memory.