Patrick Joseph O’Donnell

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Rationale: Despite animal studies implicating 3,4-methylenedioxymethamphetamine (MDMA or Ecstasy) in serotonergic neurotoxicity, there is little direct evidence of changes in neural function in humans who use MDMA as a recreational drug. Objective: The present study investigated whether there is a correlation between quantitative EEG variables (spectral(More)
Light-Front quark model spin wave functions are employed to calculate the three independent couplings gΣcΛcπ, fΛc1Σcπ and fΛc1Σcπ of S-wave to S-wave and P-wave to S-wave one-pion transitions. It is found that gΣcΛcπ = 6.81 MeV , fΛc1Σcπ = 1.16 and fΛc1Σcπ = 0.96 × 10−4 MeV. We also predict decay rates for specific strong transitions of charmed baryons. In(More)
Size is an important visuo-spatial characteristic of the physical world. In language processing, previous research has demonstrated a processing advantage for words denoting semantically "big" (e.g., jungle) versus "small" (e.g., needle) concrete objects. We investigated whether semantic size plays a role in the recognition of words expressing abstract(More)
The present study examined how word-initial letters influence lexical access during reading. Eye movements were monitored as participants read sentences containing target words. Three factors were independently manipulated. First, target words had either high or low constraining word-initial letter sequences (e.g., dwarf or clown, respectively). Second,(More)
While many studies have investigated the role of message-level valence in persuasive messages (i.e., how positive or negative message content affects attitudes), none of these have examined whether word-level valence can modulate such effects. We investigated whether emotional language used within persuasive messages influenced attitudes and whether the(More)
We review the present status of theoretical attempts to calculate the semileptonic charm and bottom decays and then present a calculation of these decays in the light– front frame at the kinematic point q = 0. This allows us to evaluate the form factors at the same value of q, even though the allowed kinematic ranges for charm and bottom decays are very(More)
The exclusive rare decay B → Kγ takes place in a region of maximum recoil, q = 0, posing a problem for nonrelativistic quark models which are usually thought to be most reliable at zero recoil. The Bauer–Stech–Wirbel (BSW) model, formulated in the infinite–momentum–frame (IMF) formalism, is designed to work at q = 0. We show in this model that the ratio(More)