Thesearetwodifferentphysicalactions:thebreakingdownofneuropeptidechemicalsasopposedtothebreakingapartoftheneuropeptidesthemselves.Furthermore,itisnotstatedwhichofthesephysicalactionsisinvolvedwiththelossoflearningabilityandmemory.Itisnotexplicitlystatedthatthebreakingdownofchemicalscausesalossinlearningabilityandmemory,onlythatthishappensaspeoplegrowolder.Itisalsonotexpresslystatedwhetherthebreakingapartoftheneuropeptidesthemselvescausesmemorylossoralessenedlearningability.Withoutshowingadirectlinkbetweentheeffectofkeepingtheneuropeptidesfrombreakingapartandareductioninthelossofmemoryandlearningability,theefficacyofthecompoundsiscalledintoquestion.