New Paper in PNAS by Ngo et al. enti­tled “Shap­ing overnight con­sol­i­da­tion via slow-oscil­la­tion closed-loop tar­get­ed mem­o­ry reactivation”

Sleep is cen­tral for our abil­i­ty to trans­form new­ly acquired infor­ma­tion into sta­ble mem­o­ry traces. A process hypoth­e­sized to be medi­at­ed by unique brain oscil­la­tions found sole­ly dur­ing sleep, first in fore­most the <1 Hz slow oscil­la­tion, which ini­ti­ate a reac­ti­va­tion of the infor­ma­tion to be con­sol­i­dat­ed. But what is the tem­po­ral rela­tion between sleep slow oscil­la­tions and mem­o­ry reactivation?

Togeth­er with Bern­hard Staresina from the Uni­ver­si­ty of Oxford, Hong-Viet V. Ngo recent­ly pub­lished a study uti­liz­ing tar­get­ed mem­o­ry reac­ti­va­tion (TMR): a tech­nique to exter­nal­ly dri­ve reac­ti­va­tion by expos­ing sleep­ing sub­jects to audi­to­ry reminder cues. Using this approach, they com­pared the impact of slow oscil­la­tion phase on the TMR out­come, i.e. they con­trast­ed a cue­ing phase-locked to slow oscil­la­tion peaks (up-states) vs. cues pre­sent­ing dur­ing slow oscil­la­tion troughs (or down-states). Their results show that up-state cue­ing led to a sig­nif­i­cant­ly low­er for­get­ting than down-state cue­ing. More­over, elec­tro­phys­i­o­log­i­cal brain pat­terns reflect­ing reac­ti­vat­ed infor­ma­tion were more pro­nounced after up-state cue­ing. Alto­geth­er these results pro­vide impor­tant insight for the endeav­or to exper­i­men­tal­ly mod­u­late mem­o­ries dur­ing sleep.

You can find the full arti­cle here.