Psychology, neuroscience, and neurology
I’m now back in the country after my long and very eventful trip. The brain imaging conference was fabulous. Anyway, I just wanted to add a few more of my development lecture slides in PDF format. They are fairly brief and again, just outlines of the material but I tried to fill in a little more info.
I’ll post some more neuroscience material soon – I just have to get caught up on a week’s worth of missed school and related work.
Biological Influences on Development
I’m sorry for the bereft of posts recently. I’ve been talking vacation since summer classes ended. Classes start up again in about a week. Once again, I’m sorry for not updating.
I used to teach a lifespan development class. I’ve posted the slides from the first couple of lectures. I briefly cover the topics of development in general as well as a number of the theories of development. As these were lecture slides, they are merely outlines and not packed full of information but the info they provide should be sufficient to obtain a basic knowledge of the concepts. At the very least it can serve as a springboard in the the vast pool of developmental psychology.
The lectures are in PDF format.
Overview of Developmental Psychology
I’m continuing my recent trend of basic cognitive psychology posts. The following post is about the Modal Model of memory, which has been highly influential for a number of decades but it is slowly being modified over time. I won’t get into the more modern modifications of the modal model, rather, in my post I present the very traditional view of memory, even if it is somewhat controversial today. For example, a number of psychologists do not believe that short term memory really exists (working memory fills in the gap). In any case, my post serves as a brief introduction to a classic view of memory and of the primacy and recency effects.
The modal model of memory has three main components. They are: sensory register, short-term memory (STM), and long-term memory (LTM). This Atkinson and Shiffrin model of memory assumes that the processes of moving information from the sensory store to short-term and then long-term memory takes place in discrete stages. At any of these stages information can be lost through interference or decay. Another assumption of this model is that information processing has to start in the sensory register and be attended to, then move to STM, and then to LTM with rehearsal.
The serial position effect (split into the primacy and recency effects) is that the first few and last few items in a word list, for example, are the easiest to remember. A graph of this effect would be roughly parabolic (i.e., U-shaped). The primacy effect occurs because people have time to rehearse the first few items until the STM capacity is reached. The recency effect occurs because the last items are still in STM and have not decayed yet so they are easy to remember. The items in the middle of lists are easy to forget because STM capacity is too full for much rehearsal by then and as more items are presented, older items in STM are “pushed out.”
There are ways to hinder the primacy or recency effects though. If items are presented rapidly then there is not time to rehearse the items and the primacy effect fades away. If there is a distracting task given at the end of the main task (similar to Peterson and Peterson’s 1959 study testing the decay rate of STM), then the recency effect disappears due to STM capacity being taken up by the distracters, which leads to decay of the information in STM. These findings indicate that the systems governing primacy and recency effects are separate. The findings also gave support to the modal model because researchers identified the primacy effect with the transfer of STM into LTM. The recency effect is just an example of information being in STM.
I’ve posted some PDF slides that briefly cover the topic of the interaction between nature (biology/genes) and nurture (environment). Researchers used to fight over whether human behavior was attributable to nature or nurture. Now we just accept that it is a mixture of both, but researchers still discuss whether nature or nurture is more influential on a particular behavior.
I’ve posted links to slide providing a basic overview of brain anatomy and function. There are a number of copyrighted images in the slides so please do not use for non-personal information without permission. The information is in slide format so if anything is unclear please contact me for more information. Each PDF is about 1 MB so it could take a while to download with a slow connection.