Senstation and Perception is something that really caught my eye. Optical Illusions have always been something that blew my mind and it was nice to be able to learn about why. Sensation and perception are the underlying processes operating in visual illusions (124). The way to describe what happens when looking at illusions the book explains it as a perceptual process called filling in. Most often times filling in is adaptive, as it helps us make sense of our often confusing and chaotic perceptual worlds. But sometimes it can fool us, as in the case of visual illusions.
This picture is a great example of how we can be easily fooled- 
This picture shows a saxophone player. Right when you looked at it that's what you saw right away correct? But what if I said "look at this picture of this woman"... This is due to top down processing which is a concept of processing that is influenced by certain beliefs and expectancies. You had initially expected to see a saxophone player right away, and that is what your mind saw due to a certain expectancy and belief that you had in your mind.
Overall though, what we learnt about ovulation was very interesting to me. As odd of a topic this was it is something that stuck with me. Women are more attractive during ovulation. This is something that I never had heard of. The video clip we watched in our discussion section was incredibly interesting! When ovulating, a female's features are more profound. Such as her lips may be more full, have more pigment in their cheeks and their face, their faces may be more round and overall just a more appealing look. Ovulation may even make someone less tired and give them a "glow".
Another interesting fact I found was about attractiveness and what draws a male more into you...pupils. As stated in the book on page 137, research demonstrates that men tend to find the faces of women with larger pupils more attractive than those with smaller pupils, even when they're unaware of their reason for their preference.
Overall, chapter 4, sensation and perception, is something that I will take with me from Psychology 1001 and most likely remember in 5 years. Although we were asked to write about one thing we will take with us 5 years from now I couldn't choose just one!!! All the topics that I mentioned are so interesting, and effect people like us! I would have never thought that a females face can look more attractive when ovulating, or that men were more attracted to women with larger pupils! I learned so much more that I didn't even mention about illusions that I will always remember and still be drawn to. It is truly amazing how the mind works!!
Glad that you learned so much!