The purpose of the present investigation was to replicate and extend the International Affective Picture System norms (Ito, Cacioppo, & Lang, 1998; Lang, Bradley, & Cuthbert, 1999). These norms were developed to provide researchers with photographic slides that varied in emotional evocation, especially arousal and valence. In addition to collecting rating data on the dimensions of arousal and valence, we collected data on the dimensions of consequentiality, meaningfulness, familiarity, distinctiveness, and memorability. Furthermore, we collected ratings on the primary emotions of happiness, surprise, sadness, anger, disgust, and fear. A total of 1,302 participants were tested in small groups. The participants in each group rated a subset of 18 slides on 14 dimensions. Ratings were obtained on 703 slides. The means and standard deviations for all of the ratings are provided. We found our valence ratings to be similar to the previous norms. In contrast, our participants were more likely to rate the slides as less arousing than in the previous norms. The mean ratings on the remaining 12 dimensions were all below the midpoint of the 9-point Likert scale. However, sufficient variability in ratings across the slides indicates that selecting slides on the basis of these variables is feasible. Overall, the present ratings should allow investigators to use these norms for research purposes, especially in research dealing with the interrelationships among emotion and cognition. The means and standard deviations for emotions may be downloaded as an Excel spreadsheet from www.psychonomic.org/archive.

The emotion-memory literature has shown that negative emotional arousal enhances memory. S. A. Christianson (1992) proposed that preattentive processing could account for this emotion-memory relationship. Two experiments were conducted to test Christianson's theory. In Experiment 1, participants were exposed to neutral and negative arousing slides. In Experiment 2, participants were exposed to neutral, negative arousing, and positive arousing slides. In both experiments, the aforementioned variable was factorially combined with a divided-attention or non-divided-attention condition. The authors predicted that, in contrast to the nondivided condition, dividing attention would adversely impact neutral and positive stimuli more than negative stimuli. The hypothesis was supported; participants recalled more high negative-arousal slides than positive or neutral slides when their attention was divided rather than nondivided.

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Sympathetic neural responses to mental stress are well documented but controversial, whereas sympathetic neural responses to emotional stress are unknown. The purpose of this study was to investigate neural and cardiovascular responses to emotional stress evoked by negative pictures and reexamine the relationship between muscle sympathetic nerve activity (MSNA) and perceived stress. Mean arterial pressure (MAP), heart rate (HR), MSNA, and perceived stress levels were recorded in 18 men during three randomized trials: 1) neutral pictures, 2) negative pictures, and 3) mental stress. MAP and HR increased during mental stress (Delta14 +/- 2 mmHg and Delta15 +/- 2 beats/min, P < 0.001) but did not change during viewing of negative or neutral pictures. MSNA did not change during viewing of neutral (Delta1 +/- 1 burst/min, n = 16) or negative (Delta0 +/- 1 burst/min, n = 16) pictures or during mental stress (Delta1 +/- 2 burst/min, n = 13). Perceived stress levels were higher during mental stress (3 +/- 0 arbitrary units) than during viewing negative pictures (2 +/- 0 arbitrary units, P < 0.001). Perceived stress levels were not correlated to changes in MSNA during negative pictures (r = 0.10, P = 0.84) or mental stress (r = 0.36, P = 0.23). In conclusion, our results demonstrate robust increases in MAP and HR during mental stress, but not during emotional stress evoked by negative pictures. Although the influence of mental stress on MSNA remains unresolved, our findings challenge the concept that perceived stress levels modulate MSNA during mental stress.

Flashbulb memories are vivid memories of the details surrounding the discovery of an emotional event. We investigated whether the nuclear accident that occurred in Japan in 1999 produced flashbulb memories among people who lived near the accident site. A questionnaire was distributed twice (approximately 3 weeks after the accident and 1 year later) to (1) the residents of the communities surrounding the accident site, (2) the students at a university near the accident site, and (3) the students at two universities far away from the accident site. Flashbulb memory holders were defined as those individuals who showed consistent memories between test and retest. The results indicated that only a small percentage of participants formed flashbulb memories. Further, no age-related decline was found. Flashbulb memories were distinguished by perfect or near perfect scores on four attributes: source, place, activity, and people. The results also indicated that the ratings on emotional reactions, personal consequentiality, and surprise did not differentiate between the flashbulb and non-flashbulb memory holders. In contrast, the flashbulb memory holders reported rehearsing more than the non-flashbulb memory holders. These results supported the notion that flashbulb memories are formed through rehearsal rather than at encoding. However, it is also possible that rehearsal was a result of the flashbulb memory.

The purpose of the investigation was to examine the influence of the victim's provocation and hopefulness on the sentencing of a husband convicted of domestic violence. It was hypothesized that mock jurors would assign less-severe sentencing if the victim was provoking and hopeful. Mock jurors read one of four factorial court case combinations of provocation and hopefulness and rendered an individual predeliberation sentence and a group postdeliberation sentence. Analyses revealed a significant effect of provocation, indicating that participants reduced the sentencing for the defendant when the wife was provoking relative to when she was not provoking. The analyses also revealed an effect of gender on predeliberation sentencing, with women delivering more-severe sentences than men. The effect of gender was not present in the postdeliberation sentencing, indicating that deliberation produced a sentencing compromise between women and men. The implications of these findings are discussed.

The relationship between negatively arousing pictorial stimuli and memory was investigated using a repeated testing paradigm. Based on the previous literature, it was assumed that the superior memory for negatively arousing material was due to elaboration. Therefore, we hypothesised that negatively arousing material would produce more hypermnesia than neutral material because of the increased elaboration associated with negatively arousing stimuli. A total of 160 participants viewed negatively arousing or neutral slides for either 1 second or 5 seconds and completed three free recall tests. During the inter-test intervals, participants worked on a filler task or sat quietly. The results showed superior memory for negatively arousing slides over neutral slides, and an increase in memory across tests for the arousal condition but not for the neutral condition. The results did not provide strong support for the elaboration hypothesis.The purpose of this study is to examine the effect of negative arousal and elaboration on memory, using a repeated testing paradigm. Memory for negative emotional events is of interest to those who try to evaluate the accuracy of eyewitness testimony. The testimony in question usually is related to some type of traumatic, or otherwise emotional, event. Witnesses are asked to recall information related to the emotional event, and they are asked to do this repeatedly (Cassel & Bjorklund, 1995). These situations call into question the accuracy of recall for emotional events in addition to the accuracy of recall under the condition of repeated testing. Using emotional and neutral materials, with a repeated testing paradigm, it is possible to address the question of accuracy for emotional stimuli in repeated testing.

In this study lateral differences in tympanic membrane temperature (TMT) were explored as an index of cerebral lateralization. TMT posttask differences were examined for sustained attention to response tasks (SARTs) following the presentation of negative and neutral emotional picture stimuli. Right TMT changed significantly more from baseline TMT than did left TMT after participants performed SARTs, a finding consistent with previous research indicating right cerebral dominance for sustained attention and response inhibition. Moreover, there was a trend (p = .09) for a picture stimuli by hemisphere interaction, with right-left differences in TMT being greater after the presentation of negative pictures than after neutral pictures. This result is consistent with previous findings indicating right cerebral dominance of negative emotional processing. Overall, these results support TMT as a useful and very cost effective index of cerebral lateralization.