A study on the resistance of observation systems of observers' expectancies

Different sets of expectations were induced in groups of observers before asking them to observe a film. Four aspects of Hall's notation system for the observation of proxemic behavior (1963) were adopted for the purposes of this study and another observation aspect was added. All Ss observed the same scenes of the film. They only differed in the kind of information on experimenters' beliefs and the hypotheses of the observation study. Results indicate that induced expectancies influenced the recordings of the observers. Implications of these outcomes are discussed.     

A perceptual phenomenon and its neurophysiological correlate.

A square-wave grating from which the fundamental harmonic has been subtracted (missing fundamental grating) when viewed from a suitable distance appears similar to another grating of periodicity three times higher. The neurons of the visual cortex of the cat, in a given range of spatial frequencies characteristic of each cell, give similar responses to the two gratings.