VOLUME 16 An International Journal of Current Research NUMBER 4 DECEMBER 1993 and Theory with Open Peer Commentary

Appearing in this issue, with Commentary . . . Species and individual differences in communication based On private States David Lubinski & Travis Thompson Coevoiution of neocorticai size, group size and language in humans R. I. M. Dunbar Multiple book review of Origins of the Modern Mind Merlin Donald

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© 1993 Cambridge University Press

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Lubinski, D. & Thompson, T. Species and individual differences in communication based on private states 627

Open Peer Commentary Leiber, J. What's biological about the continuity? 654 Baer, D. M. Perhaps Sisyphus is the relevant model Mitchell, R. W. Pigeons as communicators and thinkers: for animal-language researchers 642 Mon oncle d'Amerique deux? 655 Bamberg, M. Communication and internal states: Moore, C. The role of convention in the communication What is their relationship? 643 of private events 656 Baum, W. M. The status of private events in behavior Moore, J. Behaviorism, introspection and the mind's I 657 analysis 644 Mortensen, C. Private states and animal communication 658 Branch, M. N. The outside route to the inside story 644 Pepperberg, I. M. Communicative acts and drug- Bringsjord, S. & Bringsjord, E. Animal communication induced feelings 659 of private states does not illuminate the human case 645 Pious, S. Animal models of human communication 660 Capaldi, E. J. & Proctor, R. W. Plausible Salzinger, K. How do we know when private events reconstruction? No! 646 control behavior? 660 Davis, L. H. No report; no feeling 647 Stolerman, I. P. Cross-fertilization between research Garrett, R. A human model for animal behavior 648 on interpersonal communication and drug Hardcastle, V. G. Communication versus discrimination 661 discrimination 649 Thompson, N. S. Are some mental states public Hineline, P. N. A promissory note is paid, but has this events? 662 bought into an illusion? 650 Zentall, T. R. The assessment of intentionality Hocutt, M. Difference without discontinuity 651 in animals 663 Humphreys, L. G. Behaviorism is alive and well 651 Zuriff, G. E. What's the stimulus? 664 Laakso, A. Pigeons and the problem of other minds 652 LaFollette, H. & Shanks, N. Animal modeling in psychopharmacological contexts 653 Authors' Response Laird, J. D. We can reliably report psychological Lubinski, D. & Thompson, T. Animal models: Nature states because they are neither internal nor private 654 made us, but was the mold broken? 664

Dunbar, R. I. M. Coevolution of neocortical size, group size and language in humans 681 Open Peer Commentary Holloway, R. L. Another primate brain fiction: Brain Andrew, R. J. Behavioural constraints on social (cortex) weight and homogeneity 707 communication are not likely to prevent the Hyland, M. E. Size of human groups during the evolution of large social groups in nonhuman Paleolithic and the evolutionary significance of primates 694 increased group size 709 Barton, R. A. Independent contrasts analysis of Jacobs, B. & Raleigh, M. J. Sizing up social groups 710 neocortical size and socioecology in primates 694 Janson, C. H. Primate group size, brains and Brace, C. L. Brain expansion: Thoughts on hunting communication: A New World perspective 711 or reckoning kinship-or both? 695 Jarvenpa, R. Hunter-gatherer sociospatial organization Byrne, R. W. Do larger brains mean greater and group size 712 intelligence? 696 Jerison, H. J. Number our days: Quantifying social Corballis, M. C. A gesture in the right direction? 697 evolution 712 Cords, M. Grooming and language as cohesion Kincaid, H. Group size, language and evolutionary mechanisms: Choosing the right data 697 mechanisms 713 Deacon, T. W. Confounded correlations, again 698 Martins, E. P. Comparative studies, phylogenies and Dean, D. Vocal grooming: Man the schmoozer 699 predictions of coevolutionary relationships 714 Donald, M. Do grooming and speech really serve McCune, L. A developmental look at grooming, homologous functions? 700 grunting and group cohesion 716 Dugatkin, L. A. & Wilson, D. S. Language and levels Seyfarth, R. M. & Cheney, D. L. Grooming is not the of selection 701 only regulator of primate social interactions 717 Falk, D. & Dudek, B. Mosaic evolution of the Snowdon, C. T. The rest of the story: Grooming, neocortex 701 group size and vocal exchanges in neotropical Foley, R. A. Ecological and social variance and the primates 718 evolution of increased neocortical size 702 Whiten, A. Social complexity: The roles of primates' Freeman, L. C. Group structure and group size grooming and people's talking 719 among humans and other primates 703 Wind, J. Did primates need more than social Glezer, I. I. & Kinzey, W. G. Do gossip and lack of grooming and increased group size for acquiring grooming make us human? 704 language? 720 Graber, R. B. Anthropological criticisms of Dunbar's theory of the origin of language 705 Harcourt, A. H. Brains, grouping and language 706 Hauser, M., Gardner, L., Goldberg, T. & Treves, A. Author's Response The functions of grooming and language: The Dunbar, R. I. M. On the origins of language: A history present need not reflect the past 706 of constraints and windows of opportunity 721

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