---
id: "1958-07-01-perceptron"
url: "https://postcutoff.com/e/1958-07-01-perceptron/"
as_of: "2026-11-13T13:49:00+01:00"
date: "1958-07-01"
date_precision: month
category: research
importance: 5
confidence: medium
status: [Partly confirmed]
sources: 2
editor: human editor
human_review: null
version: "2026-10-07"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/1958-07-01-perceptron/

# Frank Rosenblatt's Perceptron, the first trainable neural network

Full title: Frank Rosenblatt's Perceptron — the first trainable neural network

Frank Rosenblatt introduced the perceptron, a neural network that learns its weights from examples, and demonstrated it publicly in 1958; the Mark I Perceptron hardware followed.

## Key facts
- Paper: 'The Perceptron: A Probabilistic Model for Information Storage and Organization in the Brain', Psychological Review, 1958
- Public demonstration with the US Navy in July 1958
- Mark I Perceptron machine used a 20x20 photocell input
- Minsky & Papert's 1969 book 'Perceptrons' highlighted limits of single-layer nets

## What happened

Rosenblatt's perceptron learned to classify simple visual patterns by adjusting connection weights, first simulated on an IBM 704 and later built as dedicated hardware.

## Why it matters

It was the first learning neural network and the direct ancestor of modern deep learning; the hype and later backlash around it foreshadowed later AI boom-bust cycles.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [The Perceptron (Psychological Review, DOI)](https://doi.org/10.1037/h0042519) (doi.org, paper)
2. [Wikipedia: Perceptron](https://en.wikipedia.org/wiki/Perceptron) (en.wikipedia.org, discussion)

## Changes

- 2026-09-29 (filed): Created

## Related

- 1986-10-09: [Rumelhart, Hinton & Williams popularize backpropagation](https://postcutoff.com/e/1986-10-09-backpropagation/index.md)
- 1943-12-01: [McCulloch & Pitts publish the first mathematical model of a neural network](https://postcutoff.com/e/1943-12-01-mcculloch-pitts-neuron/index.md)