Mad Cow And Alzheimer’s Have Surprising Link : NPR

Mad Cow And Alzheimer’s Have Surprising Link : NPR. If this research showing a link between prion proteins and the deleterious effects of beta-amyloid plaques in rat brains holds true in humans, it has huge implications for finding a cure for Alzheimer’s disease. That would be as big as the polio vaccine or eradicating small pox. This is some research that is worth watching closely.

Aphasia Syndromes

Aphasia is an acquired disorder of language. It can manifest in various ways, including difficulty speaking or difficulty understanding speech or language. Stroke is the most common cause of aphasia with up to 40% of stroke patients experiencing some sort of aphasia. Depending on the nature of the injury (e.g., stroke, tumor, trauma), aphaisa can be temporary or permanent. Even in cases of severe stroke, some types and aspects of aphasia are treatable, with language improving over time. While language does not usually return to pre-morbid functional levels, many people with aphasia benefit greatly from speech therapy.

The following videos demonstrate two different types of aphasia – Broca’s aphasia (or non-fluent) and Wernicke’s aphasia (or fluent). Notice the differences between the aphasias.

Here is a patient with Broca’s aphasia.

Here is a patient with Wernicke’s aphasia.

At INS

I’m at INS (the annual conference of the International Neuropsychological Society) in Atlanta so I won’t be updating the blog until next week.

PBS Frontline Explores Parkinson’s Disease

Here is the video PBS recently made about Parkinson’s disease called My Father, My Brother, and Me. From what I’ve watched so far, it’s done a good job putting a face to Parkinson’s disease while also focusing on the research and clinical aspects of it.

Hypothesis Testing in Psychology Research

Hypothesis testing first starts with theory. Theories are particular assumptions about the way things are. After a theory is formulated, a conceptual hypothesis is created, which is a more specific (than pure theory) prediction about the outcome of something. Next an experimental hypothesis is created. This is where definitions are operationalized so specific matters can be tested. For example, you could operationalize affection as number of hugs and kisses and other related actions. Then you statistically hypothesize in order to measure and test one of two hypotheses: the null, or H0, which represents non-effect (i.e. no difference between samples or populations, or whatever was tested), and an alternate hypothesis, H1.

The alternate hypothesis is that there is a difference, or an effect. It can be that one mean is greater than another, or that they are just not equal. So, the purpose of statistical testing is to test the truth of a theory or part of a theory. In other words, it is a way to look at predictions to see if they are accurate. To do this, researchers test the null hypothesis. We do not test the alternate hypothesis (which is what we think will happen). We do this because we base our testing on falsification logic (i.e., it only takes one example to prove a theory is wrong but conversely you cannot prove that a theory is right without infinite examples, so we look for examples where we are wrong).

The probability associated with a statistical test is assigned to the possibility of the occurrence of Type I error. This is the probability that you will reject the null hypothesis when in fact the null is true and thus should not have been rejected. It is saying there was an effect or a difference when there really was not.

The process of statistical testing can result in probability statements about the theories under consideration but only under certain conditions. Statistical testing and hypothesizing is representative of theory when it is conceptually (verbally and operationally) connected to theory. This means that there has to be a logical and direct association between the statistical probability statements and the theory in order for those statements to represent the overarching theory. This link is forged by the experimental and conceptual hypotheses.

Psychobiology and Social Psychology

There are at least two big trends in social psychology, or at least ones that may great affect social psychology. Currently, at least according to Berntson and Cacioppo (2000), one of the fastest growing trends in psychology as a whole is psychobiology. This trend is also seen in social psychology. Another movement is that of the internet (McKenna & Bargh, 2000). As the legitimacy of the internet grew, there was more research interest in it and more interest in using it for research purposes. I will first discuss psychobiology and then the internet. I will finish with my prediction of where social psychology is going.

I think psychobiology is a growing area in part because of the many technological advances that are being applied to psychology (namely, brain imaging and computer modeling). Psychology is becoming a technology-driven science. I think that social psychology will all move this way because of the new ways to study the concepts of social psychology. In part, it provides new ways to research “old” topics, not that anything in social psychology is that old.

Researchers can now look at biological foundations of social behavior and perception. For example, maybe there is a certain area of the brain that is activated when people name racial stereotypes. Also, there could be a different area activated when people are asked what stereotypes they believe, if any. Maybe people who say they do not believe the stereotypes still have the same area of the brain activated as those who do believe them, but in addition they could have additional brain activity associated with suppressing those stereotypes. Knowing this would help us understand that stereotypes really are prevalent, but some people are just really good at suppressing them and don’t even know that they are doing it. I know this was a slightly vague hypothesis, but my point is that psychobiology has a lot to add the social psychology.

Continue reading “Psychobiology and Social Psychology”

Contributions of Social Psychology Research

The Crowd Looking at the Clock by Ms. Abitibi
The Crowd Looking at the Clock by Ms. Abitibi

Social psychology is the study of individuals within groups, or as they are affected by others. So, while groups are important and often studied, it is really the individual who ultimately receives the focus. It is different from other subdisciplines in that interpersonal relationships are taken into account. In other words, people’s behaviors, thoughts, and emotions are affected by their relationships to and with others. This differs from cognitive psychology, for example, because cognitive theorists typically are just looking at mental processes and trying to understand the basic nature of thought, without [much] regard to the influence that others have on cognition. I say “much” because social and cognitive psychology have had a long relationship so there is some overlap between the two.

Social psychology is different from behaviorism in that social psychologists look at underlying cognitive processes and behaviorists do not. Although, they are similar in that both look at external influences on behavior (after all, behaviorism is that all behavior is learned from others). So, really the biggest difference between social psychology and all other subdisciplines of experimental psychology is the focus on self and other influences on affect, behavior, and cognition.

These three main components of social psychology—affect, behavior, and cognition—are all areas of psychology where social psychology has provided key and keen insights. One aspect of the uniqueness of social psychological research is how often researchers get surprising results from their studies. First, I’ll address the insights we’ve gained from social psychology about affect (i.e., emotion), behavior, and cognition. Continue reading “Contributions of Social Psychology Research”

Oldest Human Brain Remains Found

Archeologists discovered what may be the oldest human brain. The brain matter is within a skull and is fossilized, or in a similar state. Researchers estimate that the brain dates to around 300 BC. Here’s the link to the BBC story.

Patient HM’s Passing

On Tuesday, December 2, 2008, Henry M., the most famous patient in modern neuroscience research and literature, passed away. He was 82. In 1953, H.M. had an experimental brain operation to try to stop his frequent seizures; his medial temporal lobes were resected bilaterally, with significant portions of his amygdalas and hippocampi in both cerebral hemispheres removed (parts of the brain are still resected in intractable epilepsy cases, however neurosurgeons do not perform that exact surgery any more because of the negative effects). His seizures stopped but immediately after the operation he had a severe anterograde amnesia. This means that from when he received the operation at age 27, he was unable to establish new memories for world events and for general information.

His amnesia became the focus of much scientific study from after his operation until the present. No one patient has been studied more in the 20th and 21st centuries than H.M. His memory impairment was also interesting because his overall intellectual abilities were still intact as was his personality. Neuropsychologists and neuroscientists will forever be grateful for the things they learned from H.M.

The New York Times has a very nice article about H.M.

Revisiting Clive

Yesterday I posted a video clip about Clive Wearing. Here is the first part of a different documentary about Clive. This video goes more in-depth about his condition. Clive is sometimes referred to as the man with the shortest memory. Not only were his two hippocampi destroyed, but also surrounding areas of the his temporal lobes as well as portions of his left frontal lobe. He also remembers very little from before his illness, which is quite rare; this condition is called retrograde amnesia. Clive lives in an ever-present now, without connection to past or future. Other parts to this video can be found on YouTube.