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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 1d

It's conference season! #SfN2025

See my poster from the @aliciaizquierdo.bsky.social and Wikenheiser labs @sfn.org on Tuesday @ 1-3pm.

☀️ DM me to meet up in beautiful San Diego ☀️

Alicia Izquierdo @aliciaizquierdo.bsky.social · 6d

Pay us a visit at #SfN2025 🧠 in San Diego ☀️!

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 3d

(4/4) I'm doing a couple more experiments before I finish up my PhD & oooweee it's nice to use a task that rats learn quickly w/ a lot of interesting outputs.

Work done in part thanks to @hhmi.org w/ the best collab btwn @aliciaizquierdo.bsky.social & Andrew Wikenheiser. best co-mentorship eva!

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 3d

(3/4) A couple years back, Andrew and I were talking about how PR, given a consistent work rate, kinda looked like a depleting patch (re: foraging). Now, applying optimality modeling, we find that our rats "overharvest" similarly to (other) patch-leaving tasks 🤯.

Rats' strategies were correlated with, but systematically greater than, the optimal bout length. The model-determined optimal bout length is plotted against the median bout length observed in each session. Observed bout length was strongly correlated with the model-predicted optimal bout length. However, nearly all points fall above the dashed unity line, indicating that rats frequently performed longer bouts than predicted by the model. Histograms along the x- and y-axis show density estimates computed separately for 60 s and 10 s reset delay data.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 3d

(2/4) Bout (length of time pressing for reward between no-access delay periods) length & frequency are sensitive to delay length. ***Note, the differences in the y-axis.

Ratio resets segmented PRR task performance into bouts of work. Cumulative records of active lever presses are plotted for the first 800 s of three example sessions. Grey tick marks indicate reward delivery times. (A) In PR task sessions, rats earned reinforcers quickly at the beginning of sessions, but reward rate decreased as the ratio requirement progressed. Example record from session 2 of PR. In PRR sessions (B–C), lever pressing was segmented into bouts by ratio resets, which resulted in the reset delay (shaded regions). Example records of session 2 PRR-60 (B) and session 2 PRR-10 (C). Because reset presses returned the ratio requirement to one, cumulative records for PRR-10 and PRR-60 sessions were computed separately for each bout of work between successive ratio resets. Note the very different y-axes between the three example sessions.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 3d

(1/4) TL;(please still)R on #eNeuro

Rats can reset PR to its easiest difficulty by paying a delay cost on PRR task. They adaptively use the reset lever to go from receiving ~67 pellets (PR) ➡ ~210 pellets (PRR w/60s delay)➡ ~328 pellets (PRR w/10s delay; almost 15g 😳) w/in the same amount of time.

Rats were tested on the Progressive Ratio with Resets (PRR) task where 2 levers are present in an operant box. In this example, the left-side lever allows for the rat to do progressive ratio (PR) which starts at a requirement of 1 lever press & increases by 1 lever press. to earn reward (one 45mg sucrose pellet delivered in a hopper). The right-side lever resets the ratio requirement after a fixed reset delay where they cannot press either lever. Rats can press this lever at any point during PR. In PRR-10 sessions the reset delay was 10 seconds, while in PRR-60 sessions the reset delay was 60 seconds.

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Matthew Apps @brainapps.bsky.social · 3d

Next @zeenarivera.bsky.social from UCLA for the first blitz talk on a progressive ratio task using effort.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 3d

Had to change all of my "in press" citations in this talk this morning 🤩 #MechanisticBasisOfForaging2025

www.eneuro.org/content/earl...

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · 5d

any other neuroscientists with narcolepsy out there?

Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Alicia Izquierdo @aliciaizquierdo.bsky.social · 9d

What a great lineup of speakers! Glad that @hhmi.org Gilliam Fellow @zeenarivera.bsky.social will present a blitz talk next week 🇬🇧 👏🏼 (data from a collab with the Wikenheiser lab)

Mark D Humphries @markdhumphries.bsky.social · 25d

🚨Registration for Mechanistic Basis of Foraging 2025 closes October 20th 🚨

Speakers
@mkflugge.bsky.social @aaronbornstein.bsky.social @benhayden.bsky.social @ellileadbeater.bsky.social
@davidrobbe.bsky.social @dlbarack.bsky.social @becketebs.bsky.social

uobevents.eventsair.com/the-mechanis...

Home - The Mechanistic Basis of Foraging

uobevents.eventsair.com

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Mark D Humphries @markdhumphries.bsky.social · 25d

🚨Registration for Mechanistic Basis of Foraging 2025 closes October 20th 🚨

Speakers
@mkflugge.bsky.social @aaronbornstein.bsky.social @benhayden.bsky.social @ellileadbeater.bsky.social
@davidrobbe.bsky.social @dlbarack.bsky.social @becketebs.bsky.social

uobevents.eventsair.com/the-mechanis...

Home - The Mechanistic Basis of Foraging

uobevents.eventsair.com

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Jeremy Berg @jeremymberg.bsky.social · Sep 26

2/2

This means individuals in the following statuses at the time of application are eligible:

Undergraduate in the final (senior) year of a bachelor’s degree program
Bachelor’s degree-holder with NO enrollment in a graduate degree program (non-degree graduate coursework allowed)
Individual enrolled in a joint bachelor’s-master’s degree program with at least three undergraduate years completed
First-year graduate student in their first graduate degree program with less than one academic year completed in the degree program (according to institution’s academic calendar)
Individuals enrolled in joint bachelor’s-master’s degree programs are considered graduate students. For GRFP, joint bachelor’s-master’s degrees are defined as degrees concurrently pursued and awarded.
Not be a current NSF employee.
Applications that do not meet eligibility requirements will be returned without review as being ineligible for a fellowship.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Aug 7

www.latimes.com/california/s...

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Aug 3

AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jul 30

Congrats! Very exciting work

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jul 21

😮

eLife @elife.bsky.social · Jul 20

🌎 🐸 Frog dads on taxi duty aren’t just giving their kids a lift, they might be passing on microbes too.

New research suggests parental care could shape the skin microbiome in amphibians.
buff.ly/QtViZmV
#Microbiome

Photo of a poison dart frog with blue and yellow stripes

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jul 11

remember when emily came in clutch to be my independent study professor after i dropped out of a required senior seminar class in my humanities college in progressive seattle where some of my peers referred to the filipino & the mexican students as The Colored people 🤪

preorder her book already !!!

Emily Lieb @emlieb.bsky.social · Jul 11

You can (and should!) preorder my book Road to Nowhere: How a Highway Map Wrecked Baltimore now! It’s about how and why a great American city destroyed itself, and it will be out 11/4. press.uchicago.edu/ucp/books/bo...

Road to Nowhere

Traces the birth, plunder, and scavenging of Rosemont, a Black middle-class neighborhood in Baltimore. In the mid-1950s Baltimore’s Rosemont neighborhood was alive and vibrant with smart rowhouses, ...

press.uchicago.edu

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jul 7

and definitely won't be ur last ❤️ proud of u

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jul 1

but actually what a fascinating way to engage with studying animal behavior.

my guide asked me if the prevalence of fly fishing has changed fish foraging patterns over time. i told him i'd look into it, and now i'm texting him that--yes!! (at least some) fish do some social learning to avoid lures

Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jun 30

learned how to fish. when does my lifetime supply of food get delivered

Zeena in a hat and a black tshirt holding up a 5 inch tilapia that they caught in a park.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jun 30

learned how to fish. when does my lifetime supply of food get delivered

Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Thanh Neville, MD, MSHS @thanhneville.medsky.social · Jun 11

A friend who works at Harbor-UCLA just told me that ICE was on the premises. Harbor-UCLA is a safety-net hospital & a level 1 trauma hospital. People are going to die because of these actions. This makes me so angry.

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Zeena Rivera ✨they/them✨ is looking for a postdoc position @zeenarivera.bsky.social · Jun 12

downvote downvote downvote

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Celeste Pewter @celestepewter.bsky.social · Jun 9

Per CNN and ABC News: LAPD has declared all of downtown as an unlawful assembly, telling all demonstrators to leave the area immediately.

Everyone covering/protesting, please stay safe.

(Deleted to repost w/ the link)

LAPD declares all of downtown an unlawful assembly

abcnews.go.com

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

Sam Tung @stung.art · Jun 8

Hotline for Immigrant Law Defenders:
213-833-8283

Legal representative line for CHIRLA (Coalition for Humane Immigrant Rights of Los Angeles):
213-201-3797

ACLU Rapid Response Hotline for LA County:
888-624-4752

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

kylie, themeny of the state (dodgers/zohran),,, @kylie.hater.club · Jun 9

So on one hand Los Angeles is having to fight back against ICE and state violence and on the other hand Israel just abducted everyone aboard the Madleen including Greta Thunberg and confiscated all aid so everything’s pretty fucking bad

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Reposted by Zeena Rivera ✨they/them✨ is looking for a postdoc position

unhinged leftist ☭🔻 @gnommunist.bsky.social · Jun 8

yep and super yep about the absolution part which allows most ‘good’ people to detach and ignore the contradictions. thats who it quiets down the ppl should be pissed

every day it’s ignored it’s quickly normalized as a ‘policy issue’ while the killing continues under the headlines

f
atimaaa
2 minutes ago
STARK RAVING GRAD
Fatima Mohammed @fatima m7md
Ordinary people resisting empire aren't trying to build careers in activism or anticolonial theory - they're fighting because their families are being torn apart and trampled by a machinery of death that has no conscience
& if you can't afford the courage to fight back in real ways, then at the very least, don't demean those who do. Bless their hands, their hearts, and their unshakable resolve.

Fatima Mohammed @fatima_
m7md
If you won't stand with the most militant parts of the movement, you're not here to end violence - you're in pursuit of absolution. You just want to feel clean.
you think you're going to sing your way into liberation? maybe even sell merch when the last domino of violence falls? insufferable and regressive.

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