PSY 244 Lecture Notes - Lecture 2: Fetal Alcohol Spectrum Disorder, Inner Cell Mass, Circadian Rhythm
Document Summary
Miniature, preformed humans lodged inside mother"s egg or father"s sperm: epigenesis. Proposed emergence of new structures and functions during development. Humans originate from union of two gametes (sperm from father; egg from mother) Gametes are produced through meiosis and contain 23 chromosomes; when united. Almost all eggs are formed prenatally; sperm production continues throughout life. Phylogenetic continuity: humans share many characters and developmental processes with other species, animal models can enhance understanding of human development. Day 4: inner cell mass arranged into hollow sphere. End of week 1: implantation in uterine lining. After implantation: neural tube created: brain, spinal cord. During week 2: inner cell mass differentiates into three layers. Vestibular (sense of balance) experience function before birth: taste. Flavors in amniotic uid, taste sensitivity, and fetal preferences present (desnoo research: smell. Amniotic uid odorants provide olfactory experiences: hearing. Transitory heart-rate deceleration occurs with auditory stimulation. Emerge at 10 weeks and become stable by second half of pregnancy: circadian rhythms.
