Search Results for author: Alex Murphy

Found 5 papers, 1 papers with code

Decoding Part-of-Speech from Human EEG Signals

no code implementations ACL 2022 Alex Murphy, Bernd Bohnet, Ryan Mcdonald, Uta Noppeney

This work explores techniques to predict Part-of-Speech (PoS) tags from neural signals measured at millisecond resolution with electroencephalography (EEG) during text reading.

Data Augmentation EEG +2

Its Not a Modality Gap: Characterizing and Addressing the Contrastive Gap

no code implementations28 May 2024 Abrar Fahim, Alex Murphy, Alona Fyshe

We present evidence that attributes this contrastive gap to low uniformity in CLIP space, resulting in embeddings that occupy only a small portion of the latent space.

What's the Opposite of a Face? Finding Shared Decodable Concepts and their Negations in the Brain

no code implementations27 May 2024 Cory Efird, Alex Murphy, Joel Zylberberg, Alona Fyshe

Thus, our contrastive-learning methodology better characterizes new and existing visuo-semantic representations in the brain by leveraging multimodal neural network representations and a novel adaptation of clustering algorithms.

Correcting Biased Centered Kernel Alignment Measures in Biological and Artificial Neural Networks

1 code implementation2 May 2024 Alex Murphy, Joel Zylberberg, Alona Fyshe

Using fMRI and MEG data from the THINGS project, we show that if biased CKA is applied to representations of different sizes in the low-data high-dimensionality domain, they are not directly comparable due to biased CKA's sensitivity to differing feature-sample ratios and not stimuli-driven responses.

Identifying Shared Decodable Concepts in the Human Brain Using Image-Language Foundation Models

no code implementations6 Jun 2023 Cory Efird, Alex Murphy, Joel Zylberberg, Alona Fyshe

In the final section of our analysis, we localize shared decodable concepts in the brain using a voxel-masking optimization method to produce a shared decodable concept (SDC) space.

Contrastive Learning Dimensionality Reduction

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