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Jared Medina

@jaredmedina.bsky.social
474 followers 444 following 16 posts

Assoc. Prof. at Emory University. I study touch, body representations and multisensory perception. ❤️ cognitive neuropsychology.

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Jared Medina @jaredmedina.bsky.social · 09/09/2026
Not banananas. Meta-analyses on using mirror therapy for phantom limb pain are quite mixed (short-term effects, not clearly better than sham). But it may work better in people who get the illusion more strongly. We're writing up a follow-up individual differences study now - more on this topic soon!
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
We speculate that these trajectories may be fingerprints of different causal inference strategies, varying across individuals. Authors: Grant T. Fairchild, @yuqiliu1179.bsky.social, @jaredmedina.bsky.social. Open access link: www.cell.com/iscience/ful...
cell.com
Multiple trajectories of proprioceptive drift in the mirror box illusion
Sensory neuroscience; Cognitive neuroscience
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
Potential explanation: Bayesian causal inference says the brain estimates p(common) for vision and proprioception, not *how* it uses it. Average the options → gradual drift. Pick the winner → abrupt jump. Commit at trial start → all-or-nothing. Different trajectories could mean different strategies.
Figure comparing observed illusion trajectories to simulations of three causal inference strategies. Panel A: a line graph showing the probability of a common cause, p(common), rising over a 60-second trial from about 0.3 to a plateau near 0.8, with a shaded 95% confidence band, representing evidence accumulating that vision and proprioception share a source. Panels B through E each show a pair of plots: on the left, the average time course of real trials of one trajectory type from Experiment 1; on the right, the average of 1,000 simulated trials using one decision strategy. B: Gradual trials next to Model Averaging, both showing a smooth rise. C: Abrupt trials next to Model Selection, both showing a rapid early jump to the top. D: No Illusion trials next to Probability Matching, both flat near the bottom. E: Immediate trials next to Probability Matching, both flat near the top. In each case the simulated trajectory closely resembles the observed one.
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
Furthermore, this varies by participant. Some are abrupt "jumpers" on nearly every trial, but others never get the illusion. Trials from the same person cluster together far more than chance. So it's the same illusion but a qualitatively different experience.
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
For some trials, the perceived position of the hand "jumps" abruptly from where it is to the reflection. On other trials, it slowly drifts towards the visual estimate. Some trials result in an instant shift, the moment the eyes open. Some never change at all.
Grid of 25 small line plots showing example individual trials from Experiment 1, arranged in five rows of five. In each plot, the x-axis is time from 0 to 60 seconds, and dashed lines mark the actual hand position (P, bottom) and the reflection position (V, top). Higher points = more illusion. Row 1, Abrupt: the line stays low (no illusion), then jumps to the top (full illusion) in a single step, usually early in the trial. Row 2, Intermediate: the line rises in a few steps of moderate size. Row 3, Gradual: the line climbs in many small steps across the whole trial. Row 4, Immediate: the line starts at the top and stays there. Row 5, No Illusion: the line stays near the bottom for the entire trial.
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
We examined the temporal trajectory of the illusion, asking participants to report hand position every 5 seconds. If you average across everyone, it looks like a relatively quick shift towards the visual estimate followed by a slow plateau phase. But individual trials don't look like this.
Line graph showing average proprioceptive drift over a 60-second trial in Experiment 1, with time on the x-axis and drift in centimeters on the y-axis. A blue dashed line at 0 cm marks the actual position of the hidden hand, and a green dashed line at 15 cm marks the position of the mirror reflection. Four conditions are shown: synchronous and asynchronous tapping, each with frequent (every 5 s) or infrequent (once at 45 s) position reports. All curves rise quickly in the first 5–10 seconds and then level off. The synchronous tapping curves plateau around 11–12 cm, while the asynchronous curves plateau around 6–7 cm. Shaded bands and error bars show 95% confidence intervals.
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Jared Medina @jaredmedina.bsky.social · 09/09/2026
New paper in iScience. In the mirror box illusion, you see the reflection of one hand where your other, hidden hand should be. Over time, people report feeling the hidden hand where they see it, not where it is. We found that the qualia of this illusion differ across individuals.
Figure showing five types of time course for the mirror box illusion. Each row shows a series of mirror box diagrams over time, with perceived hand position in red. Sometimes participants abruptly feel their hand is where the mirror reflection is (abrupt trials). Other times they feel a gradual shift from the actual toward the reflected position (gradual trials). Some trials fall in between (intermediate trials). On other trials, they feel their hand is at the reflected location as soon as they open their eyes (immediate trials). And sometimes they experience no illusion, perceiving the hand where it actually is.
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Nature Human Behaviour @nathumbehav.nature.com · 13/08/2026
Cutting a nerve of the hand alters the organization of digit maps in primary somatosensory cortex
dlvr.it
Cutting a nerve of the hand alters the organization of digit maps in primary somatosensory cortex
Nature Human Behaviour, Published online: 13 August 2026; doi:10.1038/s41562-026-02548-8Weber et al. show that the normally conserved spatial organization of the digit response maps in primary somatosensory cortex is altered in patients with surgically repaired hand nerves.
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Ryan Lei @ryanlei.bsky.social · 12/05/2026
I went to go look, and this time last year, NSF SBE had funded 216 awards. This year, they have funded 2.
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Jared Medina @jaredmedina.bsky.social · 21/11/2025
The SPARK Society is sponsoring a lunchtime workshop at Psychonomics (noon today, Governor's Square 12) on Science Outreach and Advocacy, featuring @ozgegurcanli.bsky.social @paulacroxson.bsky.social and @jzacks.bsky.social, moderated by me. Free lunch for the first 50 attendees - join us! #psynom25
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Ella Striem-Amit @striemamit.bsky.social · 20/08/2025
Excited to share our (Flo Martinez Addiego @yuqiliu1179.bsky.social @culhamari-lab.bsky.social) paper, now published in PNAS! www.pnas.org/doi/10.1073/... (or an easier read on medicine.georgetown.edu/news-release... )
pnas.org
Action-type mapping principles extend beyond evolutionarily conserved actions, even in people born without hands | PNAS
How are actions represented in the motor system? Although the sensorimotor system is broadly organized somatotopically, higher-level sensorimotor a...
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Hunter Schone @hunterschone.bsky.social · 21/08/2025
Now out in @natneuro.nature.com What happens to the brain’s body map when a body-part is removed? Scanning patients before and up to 5 yrs after arm amputation, we discovered the brain’s body map is strikingly preserved despite amputation www.nature.com/articles/s41593-025-02037-7 🧵1/18
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The Spark Society @sparksociety.bsky.social · 21/04/2025
Unfortunately, the NSF grant that supports our work has been terminated. This is a setback, but our mission has not changed. We will continue to work hard on making cognitive science a more inclusive field. Stay tuned for upcoming events.
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Jared Medina @jaredmedina.bsky.social · 05/03/2025
A new preprint from our lab by @yuqiliu1179.bsky.social using "single case cognitive neuroscience". We used fMRI To examine reorganization for touch and movement in two individuals with intact M1 but severely damaged S1. Read the thread below for the full story.
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Jared Medina @jaredmedina.bsky.social · 09/01/2025
Could I be added? Thank you!
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Plasticity Lab @plasticity-lab.bsky.social · 09/12/2024
We’re thrilled to share our new research article, "Shaping the developing homunculus: the roles of deprivation and compensatory behaviour in sensory remapping on bioRxiv: rebrand.ly/qbz6nal with @dorothycowie.bsky.social
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Jared Medina @jaredmedina.bsky.social · 24/11/2024
Could I be added? Thank you!
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Jared Medina @jaredmedina.bsky.social · 18/11/2024
Feel free to add me - thanks for organizing these lists.
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Jared Medina @jaredmedina.bsky.social · 22/02/2024
Our lab at Emory is hiring a full-time research assistant. Anyone with an interest in neuropsychology, plasticity, body representations and/or perceptual illusions should apply. Review will start on 3/4 and continue until filled. DM or email me w/any questions. www.jaredmedina.com/our-lab-is-h...
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Ali Cohen @aliocohen.bsky.social · 31/01/2024
The Learning, Understanding, Memory, & Neurodevelopment (LUMeN) Lab at Emory is seeking our first postdoc! ✨ Learn more about the position and apply here: faculty-emory.icims.com/jobs/123119/...
The Learning, Understanding, Memory, & Neurodevelopment Lab (LUMeN Lab, PI: Dr. Alexandra Cohen) in the Department of Psychology at Emory University (Atlanta, GA) is seeking a full-time Postdoctoral Fellow to work on studies examining how motivation and emotion influence learning, memory, and brain function across development. Projects will include analysis of fMRI and ecological momentary assessment data from an NIH-funded study examining neurocognitive mechanisms of reward-motivated memory and behaviors across development.
 
Candidates must have a PhD in Psychology, Neuroscience, or a related field by the position start date. The start date is flexible. Fluency with at least one programming language (e.g., Python, R, Matlab) and experience with fMRI are required. Developmental cognitive neuroscience research experience is preferred, but not required. 
 
Application review will take place on a rolling basis until the position is filled.
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Luke Miller @lukemillerneuro.bsky.social · 30/01/2024
New open PhD position in my lab at the Donders Institute! We are looking for a motivated PhD candidate with an interest in the computational underpinnings of body augmentation and embodiment. Deadline: 14 February, 2024 Link: www.ru.nl/en/working-a...
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Jared Medina @jaredmedina.bsky.social · 23/01/2024
Our lab is hiring a post-doc at Emory University, working on sensorimotor neuroimaging after stroke and/or multisensory integration, touch and embodiment. Start date: approximately late summer 2024. Please email me with any questions you have about the position.
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Jared Medina @jaredmedina.bsky.social · 22/01/2024
Are you an undergrad interested in post-bac programs in cognitive and brain sciences? @sparksociety.bsky.social will hold a webinar on Jan 30 at 4pm with reps from Columbia, MIT, Delaware and Pitt discussing their programs. See the flyer below for more details. Feel free to DM me with any questions.
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Jorge Morales @jorgemorales.me · 24/10/2023
We are hiring a postdoc! We're looking for someone interested in perception, imagination & consciousness, and with experience in neuroimaging (the focus is fMRI but MEG/EEG is ok). Vision science, machine learning and philosophy nerds please apply! subjectivity.sites.northeastern.edu/research/hot...
subjectivity.sites.northeastern.edu
The Subjectivity Lab
Interdisciplinary lab in Northeastern's Psychology Department researching perception, consciousness and introspection.
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Jared Medina @jaredmedina.bsky.social · 25/10/2023
Our new lab at Emory University has open positions at all levels. If you are a prospective grad student interested in neuropsychology, body illusions, plasticity or multisensory integration, apply! Potential RAs and post-docs: contact me for more info. www.jaredmedina.com/graduate-pos...
jaredmedina.com
Information for potential graduate students
Our research in the Medina lab is dedicated to understanding how the mind represents the body. Our work uses a number of different techniques, including functional and structural neuroimaging, brai…
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