Block-design

[Jessica Peter]

Hi,

Is it possible to create a version of the MST in a block-design way (e.g. comparing lures vs. old or lures vs. fixation)? What is your opinion about that?

Did you ever try to use a block-design?

Thanks and best,

Jessica

[Jessica Peter]

Hi again,

I would like to ask this question again: Is anybody aware of a way to implement the MST in a block-design?. We would like to use this task for a neurofeedback study.

Would it be possible to compare lures against old pictures or lures vs. fixation?

Any help would be highly appreciated.

Best,

Jessica

[Craig E.L. Stark]

Back in the day we used to have to run blocked all the time.  One trick we used routinely was to have a slight mix.  We might to blocks of 10 but use 8 Targets + 2 foils and then 2 Targets + 8 Foils.  Participants never caught on in part b/c to them, targets were only targets 80% of the time.  So, you could have a mostly-lure block, a mostly-target block, etc. this way and still keep people honest / in the dark.

Craig

[Shauna Stark]

I will add here that there is an effect of the number of intervening items between the target and the lure, so you should keep that in mind when designing your task. See the effect of lag in Figure 2d from Stark et al (2015; Behavioral Neuroscience).

[Jessica Peter]

Thanks a lot;this is really helpful.

I just had a look into the paper (thanks for pointing me to that!). From the Figure it appears that a short lag is best for a high LDI (both in younger and older adults), is that correct?

Best,

Jessica

[Brock Kirwan]

Yes. We see LDI go down as a function of delay between study and test. See, for example, the effects of a 12-hr delay (both with and without sleep) in Figure 2C here: https://doi.org/10.1002/hipo.22814