High temperature limits on developmental canalization in the ascidian Ciona intestinalis.

The normal embryogenesis of marine animals is typically confined to a species-specific range of temperatures. Within that temperature range development results in a consistent, or canalized, phenotype, whereas above and below the range abnormal phenotypes are produced. This study reveals a high temperature threshold, occurring over a 1-2 °C range, for normal embryonic development in C.

Contextual and auditory fear conditioning continue to emerge during the periweaning period in rats.

Anxiety disorders often emerge during childhood. Rodent models using classical fear conditioning have shown that different types of fear depend upon different neural structures and may emerge at different stages of development. For example, some work has suggested that contextual fear conditioning generally emerges later in development (postnatal day 23-24) than explicitly cued fear conditioning (postnatal day 15-17) in rats.