Holly Barker is a freelance writer specializing in biology, medicine and psychology. She has a Ph.D. in clinical neuroscience from King’s College London in the United Kingdom and a B.Sc. degree in biochemistry from the University of Manchester. She has previously written for Discover and BioNews. She is based in London.
Holly Barker
Contributing writer
From this contributor
Astrocytes in mouse amygdala encode emotional state
The glial cells’ activity reliably tracks with freezing, hesitancy and other behaviors reminiscent of anxiety.
Astrocytes in mouse amygdala encode emotional state
By
Holly Barker
24 March 2026 | 4 min read
Revised statistical bar extracts less-common variants from autism genetics studies
Adjusting genetic analyses could help plug autism’s heritability gap, according to a new preprint.
Revised statistical bar extracts less-common variants from autism genetics studies
By
Holly Barker
12 March 2026 | 4 min read
Astrocytes orchestrate oxytocin’s social effects in mice
The cells amplify oxytocin—and may be responsible for sex differences in social behavior, two preprints find.
Astrocytes orchestrate oxytocin’s social effects in mice
By
Holly Barker
4 March 2026 | 5 min read
Aging neurons outsource garbage disposal, clog microglia
Degradation-resistant proteins pass from neurons to glial cells in a process that may spread protein clumps around the brain, according to a study in mice.
Aging neurons outsource garbage disposal, clog microglia
By
Holly Barker
10 February 2026 | 5 min read
‘Tour de force’ study flags fount of interneurons in human brain
The newly discovered cell type might point to the origins of the inhibitory imbalance linked to autism and other conditions.
‘Tour de force’ study flags fount of interneurons in human brain
By
Holly Barker
29 January 2026 | 4 min read
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Head direction cells stably orient mice to outside world
The cells’ representations show little drift over time—unlike those of other navigation system neurons—and may provide a “rigid backbone” for more flexible sensory and cognitive responses.
Head direction cells stably orient mice to outside world
The cells’ representations show little drift over time—unlike those of other navigation system neurons—and may provide a “rigid backbone” for more flexible sensory and cognitive responses.
By
Angie Voyles Askham
25 March 2026 | 0 min watch
Juan Gallego discusses how manifolds are transforming our understanding of the coordination of neuronal population activity
A wealth of evidence supports the view that neural manifolds are real and useful, Gallego says, even if they may not completely solve the age-old mind-body problem.
Juan Gallego discusses how manifolds are transforming our understanding of the coordination of neuronal population activity
A wealth of evidence supports the view that neural manifolds are real and useful, Gallego says, even if they may not completely solve the age-old mind-body problem.
By
Paul Middlebrooks
25 March 2026 | 121 min listen
Data duplications flagged in highly cited gut-brain studies
The duplications are a product of “inadvertent errors,” the authors say.
Data duplications flagged in highly cited gut-brain studies
The duplications are a product of “inadvertent errors,” the authors say.
By
Claudia López Lloreda
24 March 2026 | 4 min read