Cuttlefish (Sepia officinalis: Cephalopoda) hunting behavior and associative learning

Because most learning studies in cephalopods have been performed on octopods, it remains unclear whether such abilities are specific to octopus, or whether they correlate with having a larger and more centrally organized brain. To investigate associative learning in a different cephalopod, six sexually mature cuttlefish (Sepia officinalis) participated in a counterbalanced, within-subjects, appetitive, classical conditioning procedure. Two plastic spheres (conditioned stimuli, CSs), differing in brightness, were presented sequentially. Presentation of the CS+ was followed 5 s later by a live feeder fish (unconditioned stimulus, US). Cuttlefish began to attack the CS+ with the same type of food-acquisition seizures used to capture the feeder fish. After seven blocks of training (42 presentations of each CS) the difference in seizure probability between CS+ and CS– trials more than doubled; and was found to be significantly higher in late versus early blocks. These results indicate that cuttlefish exhibit autoshaping under some conditions. The possible ecological significance of this type of learning is briefly discussed.Electronic Supplementary Material Supplementary material is available for this article at     

Temporal integration differences between crossed and uncrossed stereoscopic mechanisms

In this study, we investigated temporal integration of disparity information for crossed and uncrossed stereopsis. Across three experiments, exposure duration thresholds were measured for stereoscopic stimuli created from dynamic random-dot stereograms. In Experiment 1, an investigation of disparity detection showed that detection thresholds were equal for the crossed and uncrossed directions. In Experiment 2, an examination of duration limits for depth perception showed that critical durations were lower, and depth more veridical, for crossed depth than for uncrossed depth. In Experiment 3, an investigation of depth discrimination revealed that discrimination thresholds were lower for crossed depth than for uncrossed depth. These results suggest that crossed and uncrossed mechanisms differ in terms of their temporal integration properties at processing levels involving the computation and discrimination of depth.     

A CROSS-CULTURAL INVESTIGATION OF INFORMATION PROCESSING1

Recherche interculturell sur le traitement de l'information. — Cette expérience fait partie d'une série d'études sur les processus cognitifs des membres de la tribu des Kpelles du Liberia : elle porte plus particulièrement sur Pestimation des quantités. A 240 sujets (120 Kpelles et 120 Américains) on a présenté, à l'aide d'un tachistoscope, des plages de points avec des durées variées d'exposition. Les plages diffèrent par le nombre (de 3 à 10) et la disposition, structurée ou aléatoire, des points. La performance des sujets américains est en général supérieure à celle des Kpelles. l'analyse montre que l'avantage global des américains est dû à : — 1) leur plus grande exactitude pour les plages qui comportent plus de points; — 2) leur plus grande exactitude relative pour des durées brèves de présentation; — 3) l'utilisation plus grande de la redondance inhérente aux plages structurées. Les AA, pensent pouvoir mettre ces résultats en relation avec les apprentissages différentiels dont chaque groupe culturel a pu faire l'expérience dans son milieu propre. Ils proposent une stratégic générale pour mener des recherches expérimentales interculturelles.     

The homophile movement: Its impact and implications

Conclusion We do not conclude that homosexuality must be accepted by society. We do hope that society's attitudes towards homosexuals can be more intelligent, less confused. Perhaps our society will reject homosexuality on a basis of manifestly conscious prejudice of the majority who simply find it distasteful; but at least this will be more honest than many current rationalizations. Perhaps it will be possible and desirable because of changing conditions to accept homosexuality in our culture at some future time. Any sincere effort to confront the issues raised by homosexuality in our culture will be rewarded with a deeper understanding of many other aspects of human life.Presented to One Inc., Los Angeles, May 7, 1967.     

Moral possibility

The Journal of Value Inquiry -     

Repetition and confirmation of messages received by ear and by eye

A rating method was used to obtain operating characteristics for 60 heterogeneous words. A single message was heard in noise, or seen briefly in a tachistoscope. It was repeated until it had been assigned to the highest accuracy category (“confirmed”) or sent a maximum of six trials. The comparisons showed that it matters little whether reception is by eye or by ear. Whether within a trial or over successive repetitions, accuracy of reception is a direct function of the confidence rating and is relatively independent of the intelligibility level. Neither do the accuracy of reception or the distributions of rating categories change markedly over trials. Although no direct test was made, it appears that accuracy of reception is not lessened by the task of rating. Both visual and auditory data are fitted reasonably well by predictions made from a simple stochastic model based on the assumptions that (1) intelligibility, (2) probability of a correct acceptance, and (3) probability of an incorrect acceptance remain constant over successive repetitions. The model fits the visual better than the auditory data, as might be expected, since conditions of reception are more homogeneous over trials for vision than for audition.     

"Do I know you?" The role of significant others in general social perception

This research used an idiographic method to examine the proposition that significant others are mentally represented as well-organized person categories that can influence social perception even more than representations of nonsignificant others, stereotypes, or traits. Together, Studies 1 and 2 showed that significant-other representations are richer, more distinctive, and more cognitively accessible than the other categories. Study 3 replicated the accessibility data and gauged inferential power by indirectly activating each category in a learning trial about a fictional person and then testing recognition memory. The results showed that participants made more category-consistent false-positive errors about targets who activated significant others vs. any other category. This constitutes the first experimental demonstration of transference and has implications both for social categorization and for basic personality processes.     

Statutory definitions of death and the management of terminally ill patients who may become organ donors after death

The law stipulates that death is irreversible. Patients treated in accord with the Pittsburgh protocol have death pronounced when their condition might well be reversed by intervention that is intentionally withheld. Nevertheless, the protocol is in accord with the medical "Guidelines for the Determination of Death." However, the Guidelines fail to capture the intent of the law, which turns out to be a good thing, for the law embodies a faulty definition of death. The inclusion of "irreversible" in the legal definition makes that definition excessively demanding and out of step with the ordinary concept of death. On this basis the protocol is absolved of the moral but not the legal charge that it involves vivisection.