Several studies have suggested that both affective valence and arousal affect the perception of time. However, in previous experiments, the two affective dimensions have not been systematically controlled. In this study, standardized photographic slides rated for emotional valence and arousal were projected to two groups of subjects for 2, 4, and 6 sec. One group of subjects estimated the projection duration on an analog scale, whereas the second group of subjects reproduced the intervals by pushing a button. Heart rate and skin conductance responses were also recorded during stimulus presentation as indices of attention and arousal. Time estimation results showed neither a main effect of valence nor a main effect of arousal. A highly significant valence X arousal interaction affected duration judgments. For low-arousal stimuli, the duration of negative slides was judged relatively shorter than the duration of positive slides. For high-arousal stimuli, the duration of negative slides was judged longer than the duration of positive slides. The same interaction pattern was observed across judgment modalities. These results are interpreted in terms of a model of action tendency, in which the level of arousal controls two different motivational mechanisms, one emotional and the other attentional.In everyday life, human beings are continually engaged in emotionally driven behaviors. Such behaviors are so highly pervasive that the recent psychological literature has pointed out the centrality ofemotional factors in cognitive processes such as learning a second language (Schumann, 1990(Schumann, , 1994. Damasio (1994) has recently documented a remarkable body of neuropsychological evidence supporting the assumption that emotions are involved in most, if not all, cognitive processes.Although an increasing number of studies have investigated the role of emotions in cognitive activity, only a limited number of studies have analyzed the relationship between emotional states and estimation of time durations. Furthermore, these studies have typically yielded inconclusive results regarding the precise nature of the relationship between emotions and time perception. These inconsistent findings may originate from the use of nonstandardized emotional manipulations that make the quantification and replication of the results rather problematic.A leading theoretical approach in the current literature involves the dimensional analysis of emotions. Dimensional theories of emotion differ from basic emotions theories (Argyle, 1975;Chance, 1980;Plutchik, 1962) in that they do not classify emotions on the basis ofthe presence or absence of independent and specific emotional states (e.g., fear, anger, or joy). Instead, they assume that emotions can be represented in a multidimensional space We wish to thank G. B. Vicario, P. 1. Lang, L. Stegagno, D. Palomba, P. Bressan, R. Mucha, and L. Krueger (associate editor), and the referees for their helpful suggestions and comments. Correspondence should be addressed to Alessandro Angrilli, Antone...

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A reading time and an ERP experiment conducted in Italian investigated the parser's responses to a syntactic violation (subject-verb number agreement) and to a semantic violation (subject-verb selectional restriction), examining the time course of comprehension processes until sentence end. The reading-time data showed that the syntactic violation was detected earlier than the semantic one and that the two violations differed in the time-course. The ERP data fully supported the reading time data: Syntactic anomalies elicited a left anterior negativity (LAN) and a P600. Semantic anomalies elicited a N400 centred on the parietal sites which started 90 ms later (latency 430 ms) than the LAN. Furthermore, the N400 evoked by the words that followed the target word continued and increased until sentence end. The results are discussed with respect to the hypotheses that the parser constructs distinct syntactic and semantic analyses of a sentence and that this characteristic holds cross-linguistically. The appropriateness of different methodologies to the study of sentence processing is also evaluated.

In the present study, startle responses during resting states as well as during the presentation of a set of emotive slides were recorded from a 32-year-old male patient with a rare localized lesion of the right amygdala. The startle reflex is a response modulated by affective states: it has been reliably used in the literature to measure the aversiveness of emotive stimuli. The animal literature has shown that the circuit of this reflex is directly influenced by amygdala projections. The startle responses of the patient were compared with those of eight age-matched normal subjects. The patient's startle amplitudes showed an overall impaired response and an inhibited reflex contralateral to the lesion. In addition, he failed to show the typical startle potentiation induced by an aversive emotive background. The data confirm, in the human, previous results from the literature in other species on amygdala involvement in startle and emotional responses. Furthermore, the observation of the importance of the right amygdala in the modulation of emotion is consistent with the hypothesis of right hemisphere specialization for aversive emotions. The results are discussed in the context of the literature on human amygdala lesions.

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