Review of week 4

This week included much new information. We learnt about the most familiar of our senses: taste, smell and visual. The new thing we learned was the structure of the eye and the arrangement of the nerves in the eye. We were not familiar with the inside-out structure of the retina as well as the way neurons process the visual information that comes to the retina via horizontal cells and amacrine cells already before the signal goes to the brain. The polarization of bipolar cell does not depend only on the photoreceptor it is attached to but also surrounding photoreceptors via horizontal cells. An example of the surprising complexity of functions of retina is the event of depolarization and hyperpolarization of bipolar cells. If the surrounding receptors are exposed to the light and they are hyperpolarized but the center photoreceptor is not, then the bipolar cell in the middle is hyperpolarized. On the other hand, if the situation is vice versa, the hyperpolarization of the center photoreceptor causes depolarization of the bipolar cell.

In chapter 8, we came upon an interesting subject called “Memories of a very bad meal”. It stated that if we eat some food and we become nauseated and vomited, we will remember this for a long time and we will avoid eating that food again. When we read this, a question arose that do we also remember the very good meals in a similar way?

When we reviewed our memories about meals, we realized that we have some robust memory of some bad meals, but could not find any good memory of a very good meal. So, what do you think? Do you have a robust memory of a very good meal among your meal-related memories?


Maria, Väinö and Ruhoollah

Posted by Maria Haukka

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