- Quantity of parenthood: an idea which influences the number of children one has. Children respond particularly receptively to the ideas of their parents, and thus ideas which directly or indirectly encourage a higher birthrate will replicate themselves at a higher rate than those that discourage higher birthrates.
- Efficiency of parenthood: an idea which increases the proportion of children who will adopt ideas of their parents. Cultural separatism exemplifies one practice in which one can expect a higher rate of meme-replication — because the meme for separation creates a barrier from exposure to competing ideas.
- Proselytic: ideas generally passed to others beyond one’s own children. Ideas that encourage the proselytism of a meme, as seen in many religious or political movements, can replicate memes horizontally through a given generation, spreading more rapidly than parent-to-child meme-transmissions do.
- Preservational: ideas which influence those that hold them to continue to hold them for a long time. Ideas which encourage longevity in their hosts, or leave their hosts particularly resistant to abandoning or replacing these ideas, enhance the preservability of memes and afford protection from the competition or proselytism of other memes.
- Adversative: ideas which influence those that hold them to attack or sabotage competing ideas and/or those that hold them. Adversative replication can give an advantage in meme transmission when the meme itself encourages aggression against other memes.
- Cognitive: ideas perceived as cogent by most in the population who encounter them. Cognitively transmitted memes depend heavily on a cluster of other ideas and cognitive traits already widely held in the population, and thus usually spread more passively than other forms of meme transmission. Memes spread in cognitive transmission do not count as self-replicating.
- Motivational: ideas that people adopt because they perceive some self-interest in adopting them. Strictly speaking, motivationally transmitted memes do not self-propagate, but this mode of transmission often occurs in association with memes self-replicated in the efficiency parental, proselytic and preservational modes.