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Magnus Karlsson-Good

@mkgood

Clinical psychologist and doctoral student working to improve internet-based CBT. Interested in stats and open science. #ClinPsych #cbtworks https://www.oru.se/english/employee/magnus_karlsson-good

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Latest posts by Magnus Karlsson-Good @mkgood

I too remember the earlier, woke wars. tons of spent microaggression munitions strewn about everywhere, friends crying out for God as they were slowly cancelled...look, if you weren't there, you'll never understand

06.03.2026 12:43 πŸ‘ 2916 πŸ” 430 πŸ’¬ 112 πŸ“Œ 44

Anyone who has lived in Sweden knows how incredibly important seasonal baked goods are.

05.03.2026 19:03 πŸ‘ 6 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0

VΓ€ldigt coolt/viktigt/intressant!! πŸ‘πŸ‘ ser fram emot att lΓ€sa igenom mer noggrant

05.03.2026 19:04 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Not just spontaneous remission: Time-dependent and independent effects in pre-intervention symptom reduction Psychological symptoms tend to change over time, even in the absence of clinical intervention. For example, self-ratings are often higher at screening…

πŸŽ‰ I just published my second paper! Woo!
In psychotherapy trials we often see that symptoms reduce between screening and start of treatment. A plausible idea about that is that patients self-refer when their fluctuating symptoms are extra bad. We checked! (we tried to check) //

05.03.2026 09:11 πŸ‘ 18 πŸ” 7 πŸ’¬ 2 πŸ“Œ 2

Believe in your work. Stop ending papers with β€œMore research is needed” and start concluding with β€œNo more research on this topic is needed.”

04.03.2026 14:37 πŸ‘ 179 πŸ” 32 πŸ’¬ 11 πŸ“Œ 7
The sunk-cost fallacy can start a vicious circle sometimes referred to as an escalation
situation. Once a project – whether an R&D effort, a marriage, a financial investment,
or whatever – is beginning to go downhill, the sunk-cost fallacy encourages
people irrationally to make additional investments in the project. Once the additional
investment has been made, unless it turns the project around, people find
themselves with an even greater sunk cost, which is even harder to ignore, thereby
encouraging even greater investments. The sunk-cost fallacy and escalation behavior
are often invoked when explaining why the US spent so many years fighting
a losing war in Vietnam. According to this analysis, once soldiers were committed
and started dying, it became impossible to withdraw for fear that the dead would
have β€œdied in vain”; thus, more soldiers were committed, more soldiers died, and it
became even harder to withdraw. Interestingly, the scenario was outlined as early as
1965 by George Ball, then Undersecretary of State. In a memo to President Johnson,
Ball wrote:
The decision you face now is crucial. Once large numbers of US troops are committed to
direct combat, theywill begin to take heavy casualties in awar they are ill-equipped to fight
in a noncooperative if not downright hostile countryside. Once we suffer large casualties,
we will have started a well-nigh irreversible process. Our involvement will be so great that
we cannot – without national humiliation – stop short of achieving our complete objectives.
Of the two possibilities I think humiliation will be more likely than the achievement of our
objectives – even after we have paid terrible costs.

The sunk-cost fallacy can start a vicious circle sometimes referred to as an escalation situation. Once a project – whether an R&D effort, a marriage, a financial investment, or whatever – is beginning to go downhill, the sunk-cost fallacy encourages people irrationally to make additional investments in the project. Once the additional investment has been made, unless it turns the project around, people find themselves with an even greater sunk cost, which is even harder to ignore, thereby encouraging even greater investments. The sunk-cost fallacy and escalation behavior are often invoked when explaining why the US spent so many years fighting a losing war in Vietnam. According to this analysis, once soldiers were committed and started dying, it became impossible to withdraw for fear that the dead would have β€œdied in vain”; thus, more soldiers were committed, more soldiers died, and it became even harder to withdraw. Interestingly, the scenario was outlined as early as 1965 by George Ball, then Undersecretary of State. In a memo to President Johnson, Ball wrote: The decision you face now is crucial. Once large numbers of US troops are committed to direct combat, theywill begin to take heavy casualties in awar they are ill-equipped to fight in a noncooperative if not downright hostile countryside. Once we suffer large casualties, we will have started a well-nigh irreversible process. Our involvement will be so great that we cannot – without national humiliation – stop short of achieving our complete objectives. Of the two possibilities I think humiliation will be more likely than the achievement of our objectives – even after we have paid terrible costs.

WOTD: "escalation situation" – a cycle in which some effort fails to have the intended effect, which leads to increased efforts, which also fail to have the intended effect, which leads to even more efforts, etc. (From A Course in Behavioral Economics, p. 36) www.bloomsbury.com/us/course-in...

01.03.2026 14:33 πŸ‘ 7 πŸ” 6 πŸ’¬ 1 πŸ“Œ 0
Black and white illustration featuring a forest setting with central hippo like creature, hedgehog in the foreground and birds flying overhead

Black and white illustration featuring a forest setting with central hippo like creature, hedgehog in the foreground and birds flying overhead

Illustration from Tove Jansson's book 'The Moomins and the Great Flood'Β (1945) #Womensart

01.03.2026 07:10 πŸ‘ 868 πŸ” 142 πŸ’¬ 4 πŸ“Œ 5
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Call for Volunteers: ISRII 14th Scientific Meeting

ISRII is preparing for its 14th Scientific Meeting this October in Newcastle, Australia and we’d love your help shaping the program.

πŸ‘‰ Interested in reviewing abstracts and/or moderating sessions? Apply by March 15, 2026. isrii.org/call-for-vol...

24.02.2026 14:18 πŸ‘ 4 πŸ” 3 πŸ’¬ 0 πŸ“Œ 1
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New newspaper headline for your Intro to Causal Inference lecture just dropped

27.02.2026 12:57 πŸ‘ 164 πŸ” 33 πŸ’¬ 4 πŸ“Œ 7

This recent RCT of an "AI stethoscope" claims the technology "shows promise" for diagnosing cardiovascular conditions.

It does not.

It is a textbook example of the risks of conducting unprincipled 'per protocol analyses'. Once again, peer review at a major medical journal has failed.

🧡 1/

25.02.2026 16:44 πŸ‘ 417 πŸ” 184 πŸ’¬ 8 πŸ“Œ 31
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Despite all the chatter, social media bans for teens lack evidence! New paper out in Nature Health.

(1) Harms from social media are real & serious.

(2) We need regulatory action but bans are not nuanced, do not empower youth, & are not supported by evidence.

www.nature.com/articles/s44...

25.02.2026 12:17 πŸ‘ 81 πŸ” 40 πŸ’¬ 2 πŸ“Œ 8
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Easily one of the top charts of all time

24.02.2026 23:06 πŸ‘ 702 πŸ” 175 πŸ’¬ 26 πŸ“Œ 48

I think they are even worse than that. They showed that sex is a prognostic factor. But they don't understand that prognostic factors essentially have no place in precision psychiatry. Precision psychiatry is about treatment*covariate interactions, i.e. about effect modifiers or HTE.

25.02.2026 09:24 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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πŸ–€

24.02.2026 07:21 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Today, in honour of WEB DuBois's birthday in 1868, the @publicdomainrev.bsky.social features the hand-drawn infographics DuBois made with his students to depict the conditions of African-American life in 1900.

Arts-based pedagogy all those years ago!
buff.ly/3kdWqRD

23.02.2026 13:53 πŸ‘ 177 πŸ” 76 πŸ’¬ 2 πŸ“Œ 7

The server complimented me on how prepared I was when ordering my food and coffee. It’s possible to win at ordering and this is a normal thing to want

22.02.2026 20:18 πŸ‘ 2780 πŸ” 207 πŸ’¬ 54 πŸ“Œ 34
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Fascinating research by @dorsaamir.bsky.social et al finds marked variation in 4 cooperative behavioursβ€”fairness, trustworthiness, forgiveness, and honestyβ€”among children aged 5-13 in five societies, which converges toward the societal norms in middle childhood:

www.science.org/doi/10.1126/...

22.02.2026 09:29 πŸ‘ 12 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0

Correct

21.02.2026 19:54 πŸ‘ 11 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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The strongest version of this illusion I’ve seen! Absolute head-wrecker!

21.02.2026 16:36 πŸ‘ 385 πŸ” 123 πŸ’¬ 24 πŸ“Œ 29

N = 3800 for stable interaction estimates... yikes

20.02.2026 12:50 πŸ‘ 9 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Exclusive: US plans online portal to bypass content bans in Europe and elsewhere The portal could potentially put Washington in the unfamiliar position of appearing to encourage citizens to flout local laws.

Trump will launch a government-run website (Freedom dot gov) to host extremist and Nazi content that is banned in Europe.
www.reuters.com/world/us-pla...

19.02.2026 06:23 πŸ‘ 22 πŸ” 17 πŸ’¬ 1 πŸ“Œ 6
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Tailored digital self-help for anxiety and depression: a randomized feasibility trial with or without guidance Therapist-guided internet-based cognitive behavioural therapy (iCBT) has improved access to treatment for depression and anxiety, but scalability is limited by reliance on trained therapists. This ...

🧡 New feasibility trial published! We evaluated a tailored digital self-help intervention for adults with depressive and anxiety symptoms, delivered with or without clinician guidance. A thread:

18.02.2026 17:48 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

Taken together, the results support the feasibility of both delivery formats and motivate a fully powered RCT comparing self-help and clinician-guided iCBT for depression and anxiety.

18.02.2026 17:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

From a scalability perspective, the difference in clinician time is striking. Self-help participants required on average 36 minutes of clinician contact over the entire 8-week program, compared to 66 minutes in the guided condition – less than half the time.

18.02.2026 17:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

One notable difference emerged in satisfaction: participants who received clinician guidance reported higher satisfaction with the intervention than those in the self-help condition. A finding worth examining more closely in future trials.

18.02.2026 17:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Feasibility looked promising across both conditions. Most participants used the program on a weekly basis, and two thirds completed at least three of five modules. The intervention was rated as credible, and no serious adverse events were observed.

18.02.2026 17:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

We randomized 124 participants in Sweden to an 8-week internet-based CBT program – either with clinician guidance (n=63) or as pure self-help (n=61). The primary aim was to assess feasibility of both delivery formats.

18.02.2026 17:48 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Tailored digital self-help for anxiety and depression: a randomized feasibility trial with or without guidance Therapist-guided internet-based cognitive behavioural therapy (iCBT) has improved access to treatment for depression and anxiety, but scalability is limited by reliance on trained therapists. This ...

🧡 New feasibility trial published! We evaluated a tailored digital self-help intervention for adults with depressive and anxiety symptoms, delivered with or without clinician guidance. A thread:

18.02.2026 17:48 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
The Burden of Demonstrating Statistical Validity of Clusters – Statistical Thinking Patient clustering, often described as the finding of new phenotypes, is being used with increasing frequency in the medical literature. Most of the applications of clustering of observations are not ...

#Statistics thought of the day: If you think you can find new disease subtypes by empirically clustering patients, think again: www.fharrell.com/post/cluster... #StatsSky

18.02.2026 12:40 πŸ‘ 43 πŸ” 15 πŸ’¬ 2 πŸ“Œ 5