Lightnews — Scholar-powered news

Lindsay S. Shaffer

@lindsayshaffer.bsky.social

92 followers 39 following 150 posts

postdoc fellow at NIH NIDA investigating inference-based decision making and olfactory functioning. EEG & RewP aficionado currently dabbling with MRI.

Posts Media Videos Starter Packs

Pinned

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jul 31

who needs a diploma when you can have a belt instead??

anyways, i have a phd now and i'll have a baby boy in 9 weeks

Lindsay S. Shaffer @lindsayshaffer.bsky.social · 10d

which one of you drew these cute EEG onion people

Reposted by Lindsay S. Shaffer

Prashanthi Ravichandran @prashanthi-ravi.bsky.social · 24d

(3/10) Additionally, we show that human NAc organization is not simply divided into “core” and “shell,” but instead reflects continuous spatial gradients of MSN subtypes linked to genetic risk for psychiatric and addiction-related traits.

1 2 11

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Aug 13

Could you clarify what are the usage metrics for Google Scholar (ie number of users)? My understanding is declining usage led to Google Reader getting axed. If academic institutions and libraries are using Google Scholar, then wouldn’t having increased utility be protective here?

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jul 31

who needs a diploma when you can have a belt instead??

anyways, i have a phd now and i'll have a baby boy in 9 weeks

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jul 29

Is that a bad thing tho???

1 1

Reposted by Lindsay S. Shaffer

Celine @celineloup.bsky.social · Apr 26

I bet they did

2 2K 6.9K

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jul 8

Excited to announce that, starting in late August, I’ll be joining Thorsten Kahnt’s lab at the NIDA IRP as a IRTA postdoc! My postdoc research will focus on olfactory functioning and inference-based decision-making in people with HIV and SUD! 😁😁Happy for this next stage after graduating this summer!

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jun 21

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jun 8

last night 👐

Reposted by Lindsay S. Shaffer

Kendrick lobstar @klobstar.bsky.social · Jun 7

every day online I am forced to see the dumbest people

2 2 24

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jun 5

experiment 1 of my dissertation is finally live (and open access!) 🥲
link.springer.com/article/10.3...

The reward positivity is insensitive to reinforcer devaluation - Cognitive, Affective, & Behavioral Neuroscience

Successful behavioral adaptation requires an ongoing assessment of rewarding outcomes based on one’s current state. A frontocentral ERP associated with reward feedback, the reward positivity (RewP), h...

link.springer.com

Lindsay S. Shaffer @lindsayshaffer.bsky.social · Jun 2

the job market

Reposted by Lindsay S. Shaffer

The Transmitter @thetransmitter.bsky.social · May 30

The first published paper to emerge from @eegmanylabs.bsky.social settles a debate 20 years in the making. Read more in this month’s Null and Noteworthy. ‬‬‬‬

By @ldattaro.bsky.social

www.thetransmitter.org/null-and-not...

Null and Noteworthy—Learning theory validated 20 years later

The first published paper from EEGManyLabs’ replication project nullifies a null result that had complicated a famous reinforcement learning theory.

www.thetransmitter.org

6 10

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 28

read broadly.
publish deeply.

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 26

Martin, if you need Tokyo recs, know I’m happy to provide. I went to Japan for 3 weeks for my honeymoon with 5 days in Tokyo alone. My husband and I went all over the country and got to see a lot.

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 15

expected wood & unexpected safes and vice versa!

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 15

such as this paper be one way of examining task-irrelevant rewards? suppose participants rate which object is the most useful/valuable for lighting a fire or anchoring a boat and then complete a task where the goal shifts from lighting a fire > boat anchoring > etc. trials could also have

How usefulness shapes neural representations during goal-directed behavior

The activity of the human prefrontal cortex automatically encodes the usefulness of an item according to the current goal.

www.science.org

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 15

altogether without examining how RewP varies within paradigms that were the impetus of conceptualizing RPE. that's not to say Pavlovian is the only answer, just that Pav can bring much needed clarification to the current discussion.

btw regarding q's from section 4.1: could a similar task

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 15

i get that. i do think alot of RL work dominating EEG involves instrumental conditioning, action selection, S-R association-like tasks, etc. it's a little curious bc RPE came from rescorla-wagner, which developed initially as a model of Pavlovian conditioning. IMO it's difficult to rule out RL

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 14

reflects a cog expectation of the reward, so the CR of ♦️might manifest differently than resp to 🍇.

Also surely a response toward S-Rs (e.g., ♦️-> press 👈 -> 🍇==😀) would differ from a response toward S-Os (♦️ 👀 -> 🍇==😀 ) since the representations underlying each assoc structure are different? 😉

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 14

that since you're referring to the Baker 2009 and Holroyd 2011 papers, you're saying ♦️ -> 100% 🍇 thus ♦️ = 🍇 despite ♦️ presented for 50% of the entire expt, correct? Then is it a q of what extent the RewP reflects a conditioned response (♦️) vs unconditioned response (🍇)? I assume a Pavlovian CR

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 14

ooo, see I had something else in mind! When I saw "cue has its own value", it made me wonder if you were alluding to sign-tracking vs goal-tracking of cues since sign-tracking shows how cues develop value independent of the outcome it predicts (which I'm not sure has been done w/RewP?). But I see

Reposted by Lindsay S. Shaffer

Jim Cavanagh @jimfcav.bsky.social · May 13

Big news. After 48 drafts, Clay Holroyd and I are excited to present a narrative review and new theoretical summary on our favorite sensitive & specific EEG marker of reward receipt - the Reward Positivity: tinyurl.com/yzy98rur

3 7 18

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 14

No surprise I read this excellent write-up immediately. Q: when saying the cue itself becomes the new goal, are you suggesting the possibility that the cue obtains value independent of the outcome it predicts? Or something else?

Lindsay S. Shaffer @lindsayshaffer.bsky.social · May 13

I didn’t know you had a kid, congrats!!! 😊😊

1 1