Subjects habituated to a mild stimulus failed to have GSRs upon the intrusion of a "novel" mild intramodal stimulus. However, an intruding intermodal stimulus of approximately the same intensity caused large GSRs. These results support an explanation based on expectancy or the "neuronal model" of Sokolov, provided suitable allowance is made for changes in specificity of the model as a result of variations in the experimental situation.

A variety of visual frames and of stimulus shapes are examined in a series of three experiments to investigate.the magnitude of the frame's effect on apparent size and apparent shape. Although a slight frame effect is demonstrated under very special conditions, its importance to the perceptual experience is questioned. The predominating effect of the vertical-horizontal phenomena is also explored.

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Twenty different consonant trigrams were presented individually to 38 observers in a standard OR habituation paradigm while the GSRs and BSRs were recorded. The observers were later categorized according to extraversion and neuroticism (anxiety) scores. All observers evidenced habituation in varying degrees to these dissimilar stimuli; however, the stable observers responded to more of the stimuli than did the neurotics. This basic neuroticism effect was modified by the extraversion factor as shown by response magnitudes: stable introverts and neurotic extraverts habituated differently than did the stable extraverts and neurotic introverts. This significant extraversion × neuroticism interaction was also present, in the same form, in the BSR data: stable introverts and neurotic extraverts had declining BSR values, while with stable extraverts and neurotic introverts, the BSRs increased (i.e., they became less attentive).