Maris Fessenden is a freelance journalist and illustrator based in Bozeman, Montana. They report and write about scientific methods, genetics, health, wildlife and ecology, and the intersection of science and art.
Maris Fessenden
Contributing writer
Freelance
From this contributor
Lightweight system captures brain activity while mice jump
A thin “micro-tether” and rotating connector facilitate uninterrupted, hours-long neural population recordings as the animals freely explore their environment.
Lightweight system captures brain activity while mice jump
By
Maris Fessenden
26 September 2023 | 3 min read
Atlas of developing brain reveals rainbow of cell types
An online resource reveals all major cell types in the developing human brain during the period in which autism is thought to arise.
Atlas of developing brain reveals rainbow of cell types
By
Maris Fessenden
20 September 2019 | 2 min read
New method dramatically scales up mapping of active genes in cells
A new technique enables scientists to isolate, and chart gene expression in, tens of thousands of cells at once.
New method dramatically scales up mapping of active genes in cells
By
Maris Fessenden
23 August 2019 | 2 min read
Online platform offers one-stop shop for studying brain circuits
A browser-based platform simulates functional neuronal circuits in the brain regions of several species.
Online platform offers one-stop shop for studying brain circuits
By
Maris Fessenden
2 August 2019 | 2 min read
Database, lab tricks may crack secrets of the synapse
Two new resources may aid the study of synapses, the junctions between neurons.
Database, lab tricks may crack secrets of the synapse
By
Maris Fessenden
19 July 2019 | 2 min read
Explore more from The Transmitter
Dispute erupts over universal cortical brain-wave claim
The debate highlights opposing views on how the cortex transmits information.
Dispute erupts over universal cortical brain-wave claim
The debate highlights opposing views on how the cortex transmits information.
By
Claudia López Lloreda
12 December 2025 | 5 min read
Waves of calcium activity dictate eye structure in flies
Synchronized signals in non-neuronal retinal cells draw the tiny compartments of a fruit fly’s compound eye into alignment during pupal development.
Waves of calcium activity dictate eye structure in flies
Synchronized signals in non-neuronal retinal cells draw the tiny compartments of a fruit fly’s compound eye into alignment during pupal development.
By
Lauren Schneider
12 December 2025 | 0 min watch
Among brain changes studied in autism, spotlight shifts to subcortex
The striatum and thalamus are more likely than the cerebral cortex to express autism variants or bear transcriptional changes, two unpublished studies find.
Among brain changes studied in autism, spotlight shifts to subcortex
The striatum and thalamus are more likely than the cerebral cortex to express autism variants or bear transcriptional changes, two unpublished studies find.
By
Holly Barker
11 December 2025 | 5 min read