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craigspeelman.bsky.social @craigspeelman.bsky.social · 03/06/2026

Many people have identified many problems with the use of inferential statistics in psychology. A new approach involves examining the prevalence of target effects in a sample. That is, how many people in the group exhibited the effect of interest?

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craigspeelman.bsky.social @craigspeelman.bsky.social · 27/05/2026

A person and a group are different scales of phenomena, and the non-ergodic nature of human beings means that there is no simple way to treat them as the same kinds of things. As we discuss extensively in our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

taylorfrancis.com

The Great Psychology Delusion | Missteps, Pitfalls and How to Make a M

The Great Psychology Delusion takes an unflinching look at some of the foundational assumptions of psychological science. Exploring long-standing unanswered

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craigspeelman.bsky.social @craigspeelman.bsky.social · 20/05/2026

The lack of ergodicity in psychology is fatal for replication. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 13/05/2026

Have you ever wondered how any human could undertake science in an unbiased way, and still be human? They can’t. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 06/05/2026

Psychology in professional practice attempts to apply questionable findings, derived from aggregated group data, to individuals. The folly of this would be revealed by scientific collection and analysis of practice data. See The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 29/04/2026

Psychology assumes, with no evidence, that the mind operates according to simple principles that are similar in each mind. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 22/04/2026

A statistically significant effect derived from aggregated group data cannot be used to predict the behaviour of individuals. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 15/04/2026

Why does psychology behave as if inferences about population parameters generalise to individual members of the population? See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 08/04/2026

Unless we check how the individuals in a group behaved, we cannot assume that an aggregated statistic, such as the mean, can represent the behaviour of those individuals. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 01/04/2026

A correlation between two variables is based on only 2 bits of information from each person in a data set. This is not sufficient to tell us anything about how those variables might operate within a person. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 25/03/2026

The value of randomised control trials is lost if we can’t be sure that control group participants are an accurate indicator for how experimental group participants would behave without the intervention. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 18/03/2026

If we can’t assume that each person in a group shares similar psychological processes, we can’t assume they will be affected by control conditions in a similar way. Therefore the purpose of control is lost. See our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 11/03/2026

Have you ever wondered why psychology focuses so much on average behaviour? Unless the processes underlying behaviour are the same in each person, we might as well be looking at the average of apples, oranges and bananas.

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craigspeelman.bsky.social @craigspeelman.bsky.social · 04/03/2026

The Great Psychology Delusion, plus the underlying delusions, is discussed in our new book The Great Psychology Delusion www.taylorfrancis.com/books/mono/1...

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craigspeelman.bsky.social @craigspeelman.bsky.social · 26/09/2025

Very proud to see the publication of our book today. We dismantle many of the assumptions underlying Psychology’s research methods and highlight the shaky foundations of the discipline. Hang on tight! We do, also, propose a way forward.

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