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11

As the Wikipedia article on Masturbation summarizes, the current consensus among scientists is that masturbation has no negative effects whatsoever, and that all known positive effects are physiological (e.g. reduction of the probability to have prostrate cancer in men over 50) or on the level of general well-being (e.g. it relieves depression and leads to ...


6

Pornography laws are a relic of the Victorian era, and not based on any science. Research that can conclusively determine the effect of pornography on children is hard to come by due to the resultant ethical environment. Most research depends on self-reports: Surveys ask adolescents how much pornography they have been exposed to, and attempt to correlate ...


6

A conscious basis for gender identification? There is currently no evidence to suggest that conscious experiences are a factor in leading a transgender person to identify with the opposite sex. Additionally, there is mounting evidence that transgender children are statistically indistinguishable from children of the gender with which they identify, meaning ...


6

Eye contact is one of the principal cues humans use to evaluate where other people direct their attention. A special issue on the use of eye tracking in the Infancy journal and other studies reported that infants' eyes are useful measures of attention over a range of task domains including object perception (Johnson, Slemmer, & Amso, 2004), faces (Hunnis ...


5

I don't have a complete answer, but I'll add on to Christian's comment. I'm not really familiar with an evolutionary account of facial expressions, but folks like Adam K. Anderson have implied that the original use of facial features for sensory sampling have been co-opted for social use (e.g., to indicate attention, which Christian pointed out, or affect, ...


5

A great overview of this topic is available in Chapter 6 of the book The Invisible Gorilla by Chabris & Simons. My answer is based, in large part, on their summary of the topic. The "Mozart Effect" was originally reported by Rauscher, Shaw, & Ky (1993). In the experiment, college students completed a set of typical IQ tests. Before taking the tests, ...


5

Like all models and modeling frameworks, the utility of the approach is often tied to how much it increases our understanding of the phenomena of interest. As summarized nicely by Smith & Thelen (2003), there are developmental questions that are better conceptualized through the framework of DST than through alternative modeling frameworks due to the ...


4

The article you link to is fairly comprehensive, and probably already answers your questions. Dissociative Identity Disorder is no longer referred to as multiple personality disorder. This is a highly misunderstood disorder, and involves many possible symptoms besides the appearance of "alters". "The diagnosis itself remains controversial among mental ...


3

I think the confusion arises because the hierarchy of "activity" as described in that figure exist in the context of an ontology that is closer to dynamical perception-action cycles than to the evolutionary information processing ontology typically used in cognitivist approaches. The world is structured; it comprises discrete objectively existing ...


3

S-shaped learning curves As per A Umar Mukthar's comment, the phenomenon is known as an S-shaped learning curve. They have been a known phenomenon in psychology for many decades, and were originally attributed to trial-and-error learning sets (Harlow, 1949). Harlow defined a learning set in the following manner: The monkeys learn how to learn individual ...


3

This question is quite broad, firstly, because these tests measure different (though interrelated) cognitive faculties and at different developmental stages and secondly because there is a lot to say for each sensory impairment. However, it touches on quite interesting topics for which there have been many studies and I think a summary of the findings can be ...


2

This is probably a bit old but there is a free iOS app called the PIEL Survey. It is in the App store. There is a web site which explains how to set up Experience Sampling surveys.


2

Having one or more fetishes is very widespread, and thus rather normal. The prevalence of fetishism is not known with certainty.[21] The majority of fetishists are male.[21] In a 2011 study, 30% of men reported fetishistic fantasies, and 24.5% had engaged in fetishistic acts. Of those reporting fantasies, 45% said the fetish was intensely ...


2

Biondi et al. (1998) compared MR images of monozygotic twins and found that while the brains of monozygotic twins are not identical, they are similar. Relevant for understanding the concordance rate of schizophrenia in monozygotic twins, Suddath et al. (1990) examined MR images of monozygotic twins who where discordant for schizophrenia. They found that the ...


2

I'm not sure how constructive it is to think of it in terms of "components", because there are so many that contribute to selfishness: for example, you only feel your body's pain. Food and sex only feel good to you when you're the one experiencing them. Instead, it might be more constructive to look for components of selflessness and altruism, them being ...


1

Do you arbitrarily decide on what to define the activity, and what to define as the underlying actions? As Christian stated in his answer, there seem to be no concrete (unambiguous) steps to follow. This most likely has to do with Activity Theory being a 'framework for analysis' rather than a theory in the traditional scientific sense. It thus highly ...



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