# Multi-task Generative Adversarial Learning on Geometrical Shape Reconstruction from EEG Brain Signals

## TL;DR

This paper introduces a multi-task GAN framework that converts EEG signals evoked by geometrical shapes into accurate, detailed shape reconstructions, addressing low realism issues in EEG-based shape synthesis.

## Contribution

It proposes a novel multi-task GAN with a CNN encoder and semantic alignment constraint for improved EEG-to-shape reconstruction, outperforming existing methods.

## Key findings

- Outperforms state-of-the-art baselines in shape quality
- Enhances shape realism with semantic alignment
- Effective latent representation learning from EEG signals

## Abstract

Synthesizing geometrical shapes from human brain activities is an interesting and meaningful but very challenging topic. Recently, the advancements of deep generative models like Generative Adversarial Networks (GANs) have supported the object generation from neurological signals. However, the Electroencephalograph (EEG)-based shape generation still suffer from the low realism problem. In particular, the generated geometrical shapes lack clear edges and fail to contain necessary details. In light of this, we propose a novel multi-task generative adversarial network to convert the individual's EEG signals evoked by geometrical shapes to the original geometry. First, we adopt a Convolutional Neural Network (CNN) to learn highly informative latent representation for the raw EEG signals, which is vital for the subsequent shape reconstruction. Next, we build the discriminator based on multi-task learning to distinguish and classify fake samples simultaneously, where the mutual promotion between different tasks improves the quality of the recovered shapes. Then, we propose a semantic alignment constraint in order to force the synthesized samples to approach the real ones in pixel-level, thus producing more compelling shapes. The proposed approach is evaluated over a local dataset and the results show that our model outperforms the competitive state-of-the-art baselines.