Low Power & Effect Sizes

Yesterday I posted the following tweet which has since turned out to be my most popular tweet EVER with hundreds of retweets and "likes" in 24 hours: https://twitter.com/JimGrange/status/838436187144605696 My motivation for the tweet was quite straightforward. I have recently been emailing academics in my department every week with different topics in an attempt to raise … Continue reading Low Power & Effect Sizes


Statistics Tables: Where do the Numbers Come From?

This is a blog for undergraduates grappling with stats! Last week I was having a chat with an undegraduate student who was due to analyse some data. She was double-checking how to determine the statistical significance of her analysis. I mentioned that she could either use SPSS (which would provide the value directly), or obtain … Continue reading Statistics Tables: Where do the Numbers Come From?

flankr: Modelling Eriksen Flanker Task Performance

Do you do research using the Eriksen flanker task? Want to engage in some computational modelling of your data? I've recently had a paper published in Behavior Research Methods reporting an R package that allows users to fit two recent computational models of performance in the Eriksen flanker task: the Dual-Stage Two-Phase (DSTP) model of … Continue reading flankr: Modelling Eriksen Flanker Task Performance

(Don’t) Lose Your Inhibitions

[Cognitive inhibition can be defined as]...the stopping or overriding of a mental process, in whole or in part, with or without intention —MacLeod (2007) The concept of cognitive inhibition is rather controversial in cognitive science. When performing a task or an action in the face of competing tasks/actions, is it sufficient to activate a representation … Continue reading (Don’t) Lose Your Inhibitions

Response Time Modelling – How Many Trials?

Over the past year I have become increasingly interested in using models of simple decision making processes, as measured by two-choice response time tasks. A simple 2-choice task might ask participants to judge whether a presented number is odd or even, for example. One popular model of 2-choice RT is the Ratcliff Diffusion Model. A … Continue reading Response Time Modelling – How Many Trials?