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May 09, 2012

Is Psychology an Empirical Science? ~ DAVID KRONEMYER

  
The answer is “yes,” although it is different from physics and chemistry, and historically there has been considerable confusion surrounding this issue.  In 1948 Carl Hempel and Paul Oppenheim formulated what they called the “deductive nomological model” of scientific explanation (Hempel & Oppenheim, 1948).  A deductive nomological model is one in which a single event is subsumed under a general law.  It is fully accounted for by applying the general law to a set of initial premises or conditions, which then logically result in an observed phenomenon.  The premises must be empirically true, the conclusion logically derivable from the premises, and the general law must be a necessary component of the explanation.  Physics is the paradigm case of a science where laws of nature can be devised and applied deterministically.  Thus (simplifying), Newton apocryphally saw an apple starting to fall from a tree (the initial conditions); it descended to the ground, in some versions of the story, hitting him on the head (the observation); whereupon he devised the inverse square law (the general law) (Newton, 1687/1999).  The general law is necessary to explain what happened to the apple, and the future resting place of the apple (on the ground) is logically derivable from the general law as applied to the initial conditions (the apple falling off the tree).  Newtonian mechanics proved useful not only in clarifying what happens when subsequent apples altered their position in space and time, but also in devising hypotheses to predict specific instances where the same general law applies, for example, the trajectory of cannonballs or launching rockets to the moon.  These hypotheses can be tested experimentally.

 

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Read more @

http://phenomenologicalpsychology.com/2011/10/is-psychology-an-empirical-science/ 


Photo: Swan Lake Ballerina ~ National Geographic