Measurement of two-and three-nucleon shortrange correlation probabilities in nuclei KS The ratios of inclusive electron scattering cross sections of 4 He, 12 C, and 56 Fe to 3 He have been measured at 1 < x B < 3. At Q 2 > 1:4 GeV 2 , the ratios exhibit two separate plateaus, at 1:5 < x B < 2 and at x B > 2:25. This pattern is predicted by models that include 2-and 3-nucleon short-range correlations (SRC). Relative to A 3, the per-nucleon probabilities of 3-nucleon SRC are 2.3, 3.1, and 4.4 times larger for A 4, 12, and 56. This is the first measurement of 3-nucleon SRC probabilities in nuclei.

Within the dynamical model of Refs. [Phys. Rev. C 54, 2660 (1996); 63, 055201 (2001)], we perform an analysis of recent data of pion electroproduction reactions at energies near the (1232) resonance. We discuss possible interpretations of the extracted bare and dressed γ N → form factors in terms of relativistic constituent quark models and lattice quantum chromodynamics calculations. Possible future developments are discussed.

Using two approaches-dispersion relations and the isobar model-we have analyzed recent high precision CLAS data on cross sections of π 0 , π + , and η electroproduction on protons, and the longitudinally polarized electron beam asymmetry for p( e, e p)π 0 and p( e, e n)π + . The contributions of the resonances P 33 (1232), P 11 (1440), D 13 (1520), and S 11 (1535) to π electroproduction and of S 11 (1535) to η electroproduction are found. The results obtained using the two approaches are in good agreement. There is also good agreement between amplitudes of the γ * N → S 11 (1535) transition found in π and η electroproduction. For the first time accurate results are obtained for the longitudinal amplitudes of the P 11 (1440), D 13 (1520), and S 11 (1535) electroexcitations on protons. A strong longitudinal response is found for the Roper resonance, which rules out presentation of this resonance as a hybrid state.

Experiments 1 and 2 examined the effects of semantic satiation on category membership decision latency. Subjects overtly repeated the name of a category either 3 or 30 times, and then decided whether or not a target exemplar was a member of the repeated category. Experiment 1 obtained some evidence that member decisions are slower and nonmember decisions are faster following 30 repetitions, but only the interaction was reliable. Experiment 2 confirmed only that member decisions are slower following satiation of the category name. The results support the hypothesis that prolonged repetition of a word reduces the availability of semantic information related to that word. Experiment 3 showed that the magnitude of priming in the lexical decision task is unaffected by satiation of the prime. Several general approaches to understanding semantic satiation are discussed. The most parsimonious account assumes that satiation affects the links or pathways connecting concepts in the satiated category. The net effect is to decrease the rate of search and associative spread of activation in conceptual structures.Semantic satiation refers to the apparent loss or attenuation of the meaning of a word as a result of massed overt repetition. The reader may quickly experience this phenomenon by repeating (probably) any word for about 20-30 sec. After the first paper on semantic satiation appeared (Severance & Washburn, 1907), a substantial literature developed in the effort to demonstrate the semantic character of the effect of satiation. At the time of Esposito and Pelton's (1971) comprehensive review of the semantic satiation literature, the measurement of the effect of satiation included subjective report, the commonality and number of associates generated to the satiated word, and synonym judgment and associate retrieval time. According to Esposito and Pelton, this literature provides inconsistent support for the semantic satiation hypothesis and results that are open to alternative explanation.More recently, Neely (l977a) reported an experiment that applied the semantic priming paradigm to the semantic satiation phenomenon. The finding that lexical (wordnonword) decisions are faster when a target word is preceded by a semantically related prime word than when it is preceded by a neutral or semantically unrelated prime (Antos, 1979;Neely, 1977b) suggests that this task may provide a good demonstration of semantic satiation. Specifically, Neely argued that the semantic satiation hypothThis research was supported by a NSERC Canada grant held by Raymond Klein. Thanks are extended to Raymond Klein for support and extensive comments on earlier versions of this paper. Thanks are also extended to James Neely and David Balota for their valuable comments, and to