Nicole Rust

@NicoleCRust@neuromatch.social
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Professor (UPenn). Brain researcher. Science advocate. Book: Elusive Cures (Spring 2025). https://press.princeton.edu/books/hardcover/9780691243054/elusive-cures
https://nicolecrust.com/

Check out these 5 Big Ideas (audio and text) from my new book, Elusive Cures. All centered around the question: What will it take to treat & cure the most formidable brain disorders?

Thank you @nextbigideaclub for selecting Elusive Cures to profile.

https://nextbigideaclub.com/magazine/neuroscientists-bold-proposal-solving-brain-disorders-bookbite/56151/

The book (Chapter 1 available free for preview):
https://press.princeton.edu/books/hardcover/9780691243054/elusive-cures

A Neuroscientist’s Bold Proposal for Solving Brain Disorders

Author Nicole Rust shares 5 key insights from her new book, Elusive Cures: Why Neuroscience Hasn’t Solved Brain Disorders―and How We Can Change That.

Next Big Idea Club

Check out these 5 Big Ideas (audio and text) from my new book, Elusive Cures. All centered around the question: What will it take to treat & cure the most formidable brain disorders?

Thank you @nextbigideaclub for selecting Elusive Cures to profile.

https://nextbigideaclub.com/magazine/neuroscientists-bold-proposal-solving-brain-disorders-bookbite/56151/

The book (Chapter 1 available free for preview):
https://press.princeton.edu/books/hardcover/9780691243054/elusive-cures

A Neuroscientist’s Bold Proposal for Solving Brain Disorders

Author Nicole Rust shares 5 key insights from her new book, Elusive Cures: Why Neuroscience Hasn’t Solved Brain Disorders―and How We Can Change That.

Next Big Idea Club

The Human Affectome (2024). Over 170 authors!

It took me awhile to wrap my head around the what this paper is about - it's about organizing the "phenomena of interest" in emotion research. I've spoken to some of the authors but if anyone is game to share more of the backstory, I'd love to hear it.

To unpack that a bit: One age-old issue is that some scientific arguments boil down to scientists trying to explain different things (like what emotions are versus why they exist). Here, the authors argue for a distinction between "affective concerns" (like safety) and "affective features" (like emotions are valenced to either positive or negative).

Loosely, the first is a "Why do emotions exist?" question & the second is "What are emotions?" question (but I'm not certain where that mapping breaks down).

https://www.sciencedirect.com/science/article/pii/S0149763423004190?via%3Dihub

@jessetm @adredish
Great points. And thanks for this reference - I did not know it!
@jessetm @jonny
I agree - it's very do able!

@jonny @jessetm @adredish
I agree with a lot of what you've said here (no suprise). But at the end of the day, we do have to use words to communicate (and it's helpful if there's a lot of overlap in language) .... Personally, I'm a much bigger fan of "lumping" (like the field of memory does) and distinguishing flavors with modifiers (recognition memory, recollection memory ...) than holding a high bar for the familiar term (like "emotion") and relegating everything else to "less than".

As for the Science paper - I see value in it. For a long while, researchers have been trying to "measure emotions" in the brain, and we've fallen short of being able to measure them with precision. This is among a genre of research that illustrates how to go about it, and circumvents the thorny problem that many don't consider it an emotion if there isn't a subjective a report. Showing the cross-species consistency opens up a lot of opportunities for illustrating the neural circuits that convert experience to memory. But I also appreciate your points.

@jessetm
Good Q. The big debate centers around whether we could call anything studied in animals an emotion (given that we can’t ask them if/how they feel). Proposals include calling it things like “affective state” instead. But that’s a diff approach than, say, memory, where behavior is often used as evidence to support the label (not just verbal reports).
@adredish
These are terrific points - thank you for them!

@NicoleCRust

I look forward to reading your write up. Some thoughts.

1. I think that a large axis is how emotions are categorized within themselves. This especially arises when you start to differentiate immediate and future events. (For example, do all cultures separate anxiety and fear? I know that rage (immediate) and anger (seething) are sometimes differentiated and sometimes not.) There's some really nice work from Jackson and Lindquist on this.

2. I think one should be careful with terms like "cognitive appraisal". What allows us to determine that something is cognitively appraised?

2a. Is it that the event is in the future? (Rats definitely "worry" about future dangerous events from things they can't currently see. We know they respond behaviorally to hidden dangers. We know that they represent that hidden future in neural activity in hippocampus and elsewhere.)

2b. But also, an airpuff to the eye may always be irritating, but all mammals can "push through it". So I don't think immediacy is sufficient to reject cognitive appraisal. All mammals can, under sufficient motivation, push through an immediately negative event (shock, airpuff) to get to something in the future. Is that cognitively appraised?

2c. To get to cognitive appraisal, do we need neural data? What neural data would be sufficient to provide for cognitive appraisal?

Further (3): I think a third axis is the cross-species axis. I think we need to consider how the definitions interact with the data that we can collect from a given species. (Personally, I don't think we have any better evidence for "subjective" experience in humans than in many other mammals. We always over anthropomorphize the humans because we believe them when they talk to us. I always bring up referred pain - a human who says they have a pain in their arm is not correctly assessing the situation. Similarly, a human who says they are doing X because they are anxious about Y is often wrong about their reasons. We should not assume that humans can tell us their subjective experience any more than rats and mice can.)

Truth be told - I think that there is great evidence that mammals at least (including rats, mice, cats, dogs, monkeys, and humans) all have subjective emotional experience through activation in ventral frontal cortices. But I think the debate about "what is an emotion" needs to address the cross-species complexity.

In line with that, I just got back from a conference where several human-oriented researchers argued that humans have better visceral feedback than non-human animals and that this was a big key to "subjective experience", but when pressed they basically said that the non-human data hadn't been collected yet.

I'm writing up a few things on the big debate around "What is an emotion?" and I'm crowd sourcing wisdom. I see two big axes. Am I missing any?

1) Arguments that we should reserve "emotion" words for cases in which we have evidence for subjective experience (ie humans). ala Joe LeDoux. https://pubmed.ncbi.nlm.nih.gov/35079126/

2) Arguments about the criteria that differentiate emotions from other feelings (like hunger and tiredness). These relate to the Q: Does an airpuff to the eye evoke an emotion? (and all the discussion around this): https://www.science.org/doi/10.1126/science.adt3971
One argument that it does not: "emotion" should be reserved for situations that trigger cognitive appraisal. Emotions are not just triggered by stimuli, but also depend on context. An air puff to the eye will always be irritating.

In sum, in these debates, there's the 1) "evidence for subjective experience" dim. and (even when that evidence exists) the 2) "criteria to be an emotion" dim., which includes criteria like those in the science paper (valence, persistence, generalization) and cog appraisal.

Have I missed anything?

That is to say: I don't believe there are debates about the reality of the phenomena, just when to call them "emotion" versus some other type of "feeling" (or "affective state"). Often, defining the "phenomena of interest" is diff. from theories about it (eg the thermometer versus thermodynamics). These are a bit more intertwined in emotion research. In my description, does anything jump out at you as missing from debates about the phenomena (not the theories)?

Thanks!

Putting the "mental" back in "mental disorders": a perspective from research on fear and anxiety - PubMed

Mental health problems often involve clusters of symptoms that include subjective (conscious) experiences as well as behavioral and/or physiological responses. Because the bodily responses are readily measured objectively, these have come to be emphasized when developing treatments and assessing the …

PubMed
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My new piece in Nature Human Behavior: "We need to fight for the next generation of US researchers"

All trainees need 3 things to thrive. In the US, those things have been ripped away. Let's brainstorm and fight to get them back.

(share link): https://www.nature.com/articles/s41562-025-02246-x.epdf?sharing_token=hcXev4a-31TU_a-OJK6ZMtRgN0jAjWel9jnR3ZoTv0MYALIXurixdPyNhiHwMhlzGSYzTbCgk8k-LvtRgSz04GX7xmjDu30cxJslQ-hufZZA8Li3FllJdSC3Le0yVRFBhJDn4VkC9QTpwrJeB0iXHDc0lY-LY-dngmlCZxfZYjE%3D