Sensation seeking and augmenting-reducing: Evoked potentials and/or kinesthetic figural aftereffects?

Are psychophysiological/psychophysical scores good candidates for diagnosing temperament/personality traits and for a demonstration of the construct validity of psychometrically measured traits?

The aim of this paper is to examine the use of psychophysiological and/or psychophysical measures employed as (a) tools aimed at diagnosing personality/temperament traits and (b) criteria for estimating the construct validity of personality/temperament inventories. The exploration is based on three diferent sources: (1) data collected mainly within the neo‐Pavlovian approach on CNS properties; (2) selected examples of studies in the domain of sensation‐seeking, neuroticism, and extraversion; and (3) theoretical considerations regarding the specificity of phenomena being measured by means of psychometric and psychophysiological/psychophysical scores. It is concluded that psychophysiological and psychophysical measures may be used for the assessment of personality/temperament traits or for estimating the construct validity of psychometric tools applied in personality (temperament) research under very strict requirements and limited circumstances only. In most of the studies conducted up to now, these circumstances and requirements have not been fulfilled.

ERP augmenting/reducing and sensation seeking: a critical review

Event-related potentials (ERPs) are generally considered capable of throwing light on the biological basis of personality traits. In particular, the ERP augmenting/reducing (A/R) phenomenon has been consistently associated with personality dimensions such as sensation seeking or impulsivity. However, doubts have been expressed regarding the validity of published evidence that individuals scoring high as sensation seekers are ERP augmenters. Reports of A/R-sensation seeking correlation in the opposite direction (in keeping with Petrie's hypotheses) threaten the construct validity of A/R, and lack of intermodal consistency throws serious doubts upon the existence of the central input-regulating mechanism once thought to be associated with sensation seeking. With the aim of clarification this article reviews the literature on the relationship between ERP A/R and sensation seeking, discusses the chief problems confronted by research in this area, and makes suggestions for future studies. It is concluded that experimental conditions of stimulus intensity and inter-stimulus interval may have played a part in the inconsistencies. The need to use a variety of measures of sensation seeking is stressed, and a number of other recommendations for research in this field are made.

The psychophysiology of sensation seeking

This article summarizes studies relating the trait of sensation seeking to electrodermal and heart-rate responses and cortical evoked potential arousal. Stimulus factors of novelty, intensity, and stimulus significance are important. High sensation seekers tend to give stronger physiological orienting responses than lows to novel stimuli of moderate intensity, particularly when such stimuli are of specific interest. Lows tend to show defensive responses as defined by heart-rate acceleration. The cortical reaction of the highs tends to be augmented by intense visual or auditory stimuli, while that of the lows tends to be reduced or unresponsive to variations in stimulus intensity. Differences between psychophysiological responses of high and low sensation seekers are interpreted as reflective of different evolved biological strategies for processing novel or intense stimulation.