Reza Shadmehr
@rezashadmehr.bsky.social
Father, husband, scientist
A study finds that cats meow harder to greet their male caregivers than female. Females are more verbally interactive, more skilled at interpreting cat meows. Apparently males require more meows to notice and respond to the needs of their cats.
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
November 28, 2025 at 1:03 PM
A study finds that cats meow harder to greet their male caregivers than female. Females are more verbally interactive, more skilled at interpreting cat meows. Apparently males require more meows to notice and respond to the needs of their cats.
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
Shadows of our lab mates as the sun sets over San Diego and SFN comes to an end.
November 21, 2025 at 7:29 PM
Shadows of our lab mates as the sun sets over San Diego and SFN comes to an end.
At SFN in San Diego.
November 15, 2025 at 3:28 PM
At SFN in San Diego.
Our intelligence and cognitive abilities are perhaps due to an expansion of our cerebral cortex. But surprisingly, compared to highly intelligent birds, primates have many more neurons in their cerebellum as compared to the cerebral cortex.
doi.org/10.1073/pnas...
doi.org/10.1073/pnas...
November 9, 2025 at 4:55 PM
Our intelligence and cognitive abilities are perhaps due to an expansion of our cerebral cortex. But surprisingly, compared to highly intelligent birds, primates have many more neurons in their cerebellum as compared to the cerebral cortex.
doi.org/10.1073/pnas...
doi.org/10.1073/pnas...
The bird branch of evolution separated from mammals hundreds of millions of years ago. Yet, their cerebellum has the same structure as ours, including the zebrin bands. Here is the cerebellum of the zebra finch and the most amazing flyer of them all, the hummingbird. doi.org/10.1159/0005...
November 7, 2025 at 1:27 PM
The bird branch of evolution separated from mammals hundreds of millions of years ago. Yet, their cerebellum has the same structure as ours, including the zebrin bands. Here is the cerebellum of the zebra finch and the most amazing flyer of them all, the hummingbird. doi.org/10.1159/0005...
Birds are both intelligent and incredibly agile, yet they are quite small. How do they achieve this with their little brains?
They have twice as many neurons per brain mass than mammals, including primates.
www.pnas.org/doi/abs/10.1...
They have twice as many neurons per brain mass than mammals, including primates.
www.pnas.org/doi/abs/10.1...
November 7, 2025 at 12:55 PM
Birds are both intelligent and incredibly agile, yet they are quite small. How do they achieve this with their little brains?
They have twice as many neurons per brain mass than mammals, including primates.
www.pnas.org/doi/abs/10.1...
They have twice as many neurons per brain mass than mammals, including primates.
www.pnas.org/doi/abs/10.1...
I don't have much of a view from my office window, but this morning, the wind was brushing the vapor trails left by the rushing jets, leaving behind the froth of a cresting wave. If this was a superhero movie, there would be a surfer riding the waves in the sky.
September 29, 2025 at 11:50 AM
I don't have much of a view from my office window, but this morning, the wind was brushing the vapor trails left by the rushing jets, leaving behind the froth of a cresting wave. If this was a superhero movie, there would be a surfer riding the waves in the sky.
The cerebellum receives a surprisingly rich amount of information regarding stimulus value via its climbing fibers. What role does this pathway play in learning to make better decisions? Haining Zhong will explain.
September 22, 2025 at 11:23 AM
The cerebellum receives a surprisingly rich amount of information regarding stimulus value via its climbing fibers. What role does this pathway play in learning to make better decisions? Haining Zhong will explain.
Haining Zhong imaged climbing fibers during auditory discrimination, finding that they encode cue identities and perceptual choices. The responses were reshaped by reversal learning. The predictive nature of these signals suggests a role for climbing fibers in decision-making.
Zoom link: email me.
Zoom link: email me.
September 19, 2025 at 8:02 AM
Haining Zhong imaged climbing fibers during auditory discrimination, finding that they encode cue identities and perceptual choices. The responses were reshaped by reversal learning. The predictive nature of these signals suggests a role for climbing fibers in decision-making.
Zoom link: email me.
Zoom link: email me.
The talks are open to all (please contact me).
The recorded talks are available here:
www.youtube.com/@shadmehrlab...
The recorded talks are available here:
www.youtube.com/@shadmehrlab...
September 4, 2025 at 1:39 PM
The talks are open to all (please contact me).
The recorded talks are available here:
www.youtube.com/@shadmehrlab...
The recorded talks are available here:
www.youtube.com/@shadmehrlab...
To understand cortico-cerebellar connectivity in humans, the usual approach is to exploit the correlations of functional brain imaging signals during rest.
In this talk, Jorn Diedrichsen will present results suggesting that a better approach is to measure co-activation during specific tasks.
In this talk, Jorn Diedrichsen will present results suggesting that a better approach is to measure co-activation during specific tasks.
September 4, 2025 at 1:39 PM
To understand cortico-cerebellar connectivity in humans, the usual approach is to exploit the correlations of functional brain imaging signals during rest.
In this talk, Jorn Diedrichsen will present results suggesting that a better approach is to measure co-activation during specific tasks.
In this talk, Jorn Diedrichsen will present results suggesting that a better approach is to measure co-activation during specific tasks.
The talks are open to all. The recordings are available: www.youtube.com/@shadmehrlab...
June 13, 2025 at 12:38 PM
The talks are open to all. The recordings are available: www.youtube.com/@shadmehrlab...
Shlomi Haar will present longitudinal studies of Parkinson's disease, focusing on anatomical and connectivity changes in the brain. Before diagnosis, there is a surprising increase in cerebellar white matter volume, followed by degeneration post-diagnosis.
June 13, 2025 at 12:38 PM
Shlomi Haar will present longitudinal studies of Parkinson's disease, focusing on anatomical and connectivity changes in the brain. Before diagnosis, there is a surprising increase in cerebellar white matter volume, followed by degeneration post-diagnosis.
The recorded talks are available: www.youtube.com/@shadmehrlab...
June 7, 2025 at 12:07 PM
The recorded talks are available: www.youtube.com/@shadmehrlab...
Rui Costa introduces a computational framework in which cerebellar networks learn to guide cerebral cortex dynamics with task-outcome predictions.
June 7, 2025 at 12:07 PM
Rui Costa introduces a computational framework in which cerebellar networks learn to guide cerebral cortex dynamics with task-outcome predictions.
The recorded talks are available: www.youtube.com/@shadmehrlab...
June 2, 2025 at 11:56 AM
The recorded talks are available: www.youtube.com/@shadmehrlab...
The cerebellum builds internal models of self motion, making it possible for us to read both the signs on the road, and our phones, while we walk. Jean Laurens will describe this computation.
Seminars are open to all.
Seminars are open to all.
June 2, 2025 at 11:56 AM
The cerebellum builds internal models of self motion, making it possible for us to read both the signs on the road, and our phones, while we walk. Jean Laurens will describe this computation.
Seminars are open to all.
Seminars are open to all.
The recorded talks are available here: www.youtube.com/@shadmehrlab...
May 22, 2025 at 12:53 PM
The recorded talks are available here: www.youtube.com/@shadmehrlab...
In people who suffer from essential tremor, excessive cerebellar oscillations give rise to involuntary, rhythmic movements. Ming-Kai Pan will present evidence from both mice and humans demonstrating that the cerebellum contributes to real-time motor control by encoding motor frequencies.
May 22, 2025 at 12:53 PM
In people who suffer from essential tremor, excessive cerebellar oscillations give rise to involuntary, rhythmic movements. Ming-Kai Pan will present evidence from both mice and humans demonstrating that the cerebellum contributes to real-time motor control by encoding motor frequencies.
To unlearn is hard, but necessary for recovery, because without it, some memories can bring us depression and anxiety. This process is called extinction learning.
Enzo Nio and Dagmar Timmann explain the role of the cerebellum in learning to forget.
Seminars are open to all (contact me).
Enzo Nio and Dagmar Timmann explain the role of the cerebellum in learning to forget.
Seminars are open to all (contact me).
May 17, 2025 at 12:01 PM
To unlearn is hard, but necessary for recovery, because without it, some memories can bring us depression and anxiety. This process is called extinction learning.
Enzo Nio and Dagmar Timmann explain the role of the cerebellum in learning to forget.
Seminars are open to all (contact me).
Enzo Nio and Dagmar Timmann explain the role of the cerebellum in learning to forget.
Seminars are open to all (contact me).
This little bluebird was born 2 weeks ago.
Today he ventured to the opening of his birdhouse, felt the sun and the wind for the first time, stood there gripping the edge, deliberating for about 15 minutes, and then finally, leaped forward, opened his wings, and left home.
Today he ventured to the opening of his birdhouse, felt the sun and the wind for the first time, stood there gripping the edge, deliberating for about 15 minutes, and then finally, leaped forward, opened his wings, and left home.
May 11, 2025 at 6:52 PM
This little bluebird was born 2 weeks ago.
Today he ventured to the opening of his birdhouse, felt the sun and the wind for the first time, stood there gripping the edge, deliberating for about 15 minutes, and then finally, leaped forward, opened his wings, and left home.
Today he ventured to the opening of his birdhouse, felt the sun and the wind for the first time, stood there gripping the edge, deliberating for about 15 minutes, and then finally, leaped forward, opened his wings, and left home.
The talks are open to all (contact me).
The recorded talks are available here: www.youtube.com/@shadmehrlab...
The recorded talks are available here: www.youtube.com/@shadmehrlab...
May 10, 2025 at 5:47 PM
The talks are open to all (contact me).
The recorded talks are available here: www.youtube.com/@shadmehrlab...
The recorded talks are available here: www.youtube.com/@shadmehrlab...
Artificial neural networks use backprop, which attributes errors starting at the output layer, then works backwards. Cerebellum is also a multilayer network, but learning does not rely on backprop.
How does the cerebellum guide learning in all of its layers? David Ehrlich explains.
How does the cerebellum guide learning in all of its layers? David Ehrlich explains.
May 10, 2025 at 5:47 PM
Artificial neural networks use backprop, which attributes errors starting at the output layer, then works backwards. Cerebellum is also a multilayer network, but learning does not rely on backprop.
How does the cerebellum guide learning in all of its layers? David Ehrlich explains.
How does the cerebellum guide learning in all of its layers? David Ehrlich explains.
A group of neurons in the thalamus receive converging inputs from the basal ganglia and the cerebellum.
Richard Roth explains the role of these neurons in motor control and motor learning.
You can join live (email me), or watch the recordings: www.youtube.com/@shadmehrlab...
Richard Roth explains the role of these neurons in motor control and motor learning.
You can join live (email me), or watch the recordings: www.youtube.com/@shadmehrlab...
May 2, 2025 at 11:53 AM
A group of neurons in the thalamus receive converging inputs from the basal ganglia and the cerebellum.
Richard Roth explains the role of these neurons in motor control and motor learning.
You can join live (email me), or watch the recordings: www.youtube.com/@shadmehrlab...
Richard Roth explains the role of these neurons in motor control and motor learning.
You can join live (email me), or watch the recordings: www.youtube.com/@shadmehrlab...
The recorded talks are available here: www.youtube.com/@shadmehrlab...
April 26, 2025 at 11:58 AM
The recorded talks are available here: www.youtube.com/@shadmehrlab...