Subject(s)
Association Learning , Blinking , Conditioning, Classical , Learning , Mastication , Animals , Avoidance Learning , Conditioning, Operant , Female , Male , RabbitsSubject(s)
Conditioning, Classical , Fear , Neurotic Disorders/psychology , Psychological Theory , Animals , Humans , MuridaeABSTRACT
Battery operated laryngoscopes have two types of switching, one of which could cause an external spark. Laryngoscopes normally supply 2.8 volts and 0.67 amps, which theoretically gives ample energy for ignition of a cyclopropane/oxygen mixture. Attempts were unsuccessful to ignite a stoichiometric mixture of 17% cyclopropane in oxygen by breaking resistive circuits having up to 5.8 volts and 9.2 amps. It appears extremely unlikely that the common battery-powered laryngoscope can ignite a flammable mixture by sparking when being switched off.
Subject(s)
Anesthetics , Electric Power Supplies/adverse effects , Explosions , Laryngoscopes , Cyclopropanes , Electrodes , OxygenABSTRACT
Assimilation theory was employed to generate quantitative predictions relating the ingoing Müller--Lyer illusion to both angle of fin and gap between shaft and fin. Gap sizes were varied from zero to 18 mm in steps of 2 mm, and angles of fins were varied from 30 degrees to 180 degrees in steps of 30 degrees. Five subjects adjusted the length of a comparison line to match the apparent length of the shaft at each combination of gap size and angle of fin. It was predicted that the gap necessary for a reversed illusion to occur, and the gap at which the maximal reversed effect occurred, would be inversely related to angle of fins. Empirical functions verified the predictions.
Subject(s)
Illusions , Optical Illusions , Size Perception , Humans , Male , Orientation , Space PerceptionABSTRACT
An account was given of the development within the Russian literature of a uniprocess formulation of classical and instrumental conditioning, known as the bidirectional conditioning hypothesis. The hypothesis purports to offer a single set of Pavlovian principles to account for both paradigms, based upon a neural model which assumes that bidirectional (forward and backward) connections are formed in both calssical and instrumental conditioning situations. In instrumental conditioning, the bidirectional connections are hypothesized to be simply more complex than those in classical conditioning, and any differences in empirical functions are presumed to lie not in difference in mechanism, but in the strength of the forward and backward connections. Although bidirectional connections are assumed to develop in instrumental conditioning, the experimental investigation of the bidirectional conditioning hypothesis has been essentially restricted to the classical conditioning operations of pairing two CSs (sensory preconditioning training), a US followed by a CS (backward conditioning training) and two USs. However, the paradigm involving the pairing of two USs, because of theoretical and analytical considerations, is the one most commonly employed by Russian investigators. The results of an initial experiment involving the pairing of two USs, and reference to the results of a more extensive investigation, leads us to tentatively question the validity of the bidirectional conditioning account of instrumental conditioning.
