The law of maturity is the belief that less-observed events are becoming mature and, therefore, more likely to occur in the future. Previous studies have shown that the assumption of infinite exchangeability contradicts the law of maturity. In particular, it has been shown that infinite exchangeability contradicts probabilistic descriptions of the law of maturity such as the gambler’s belief and the belief in maturity. We show that the weaker assumption of finite exchangeability is compatible with both the gambler’s belief and (...) belief in maturity. We provide sufficient conditions under which these beliefs hold under finite exchangeability. These conditions are illustrated with commonly used parametric models. (shrink)

We recently demonstrated, by means of short latency afferent inhibition (SAI), that before an imagined movement, during the reaction time (RT), SAI decreases only in the movement-related muscle (sensorimotor modulation) and that a correlation exists between sensorimotor modulation and motor imagery (MI) ability. Excitatory anodal transcranial direct current stimulation (a-tDCS) on M1 could enhance the MI outcome; however, mechanisms of action are not completely known. Here, we assessed if a-tDCS on M1 prior to an MI task could affect sensorimotor modulation. (...) Participants imagined abducting the index or little finger in response to an acoustic signal. SAI was evaluated from the first dorsal interosseus after the “go” signal, before the expected electromyographic (EMG) activity. Participants received 20-min 1.5 mA a-tDCS or sham-tDCS on M1 on two different days, in random order. Results showed that a-tDCS on M1 increases the sensorimotor modulation consisting of a weakening of SAI after the Go signal with respect to sham-tDCS, in the movement-related muscle right before the beginning of MI. These results suggest that a-tDCS on M1 further potentiate those circuits responsible for sensorimotor modulation in the RT phase of MI. Increased sensorimotor modulation during MI may be one of the mechanisms involved in MI improvement after a-tDCS over M1. (shrink)

BackgroundThere are two types of voluntary interruption of pregnancy: elective and therapeutic abortion. These forms are different for many reasons, and it is reasonable to assume that they can have negative consequences that can last until a subsequent gestation. However, no study has analyzed the psychological experience of gestation after a previous abortion, distinguishing the two forms of voluntary interruption of pregnancy.ObjectiveThis study aims to explore the level of prenatal attachment and centrality of pregnancy in nulliparous low-risk pregnant women with (...) a recently previous elective or therapeutic abortion.MethodsA total of 34 nulliparous pregnant women with a history of abortion, aged from 27 to 48 years, were recruited in the maternity ward of a public hospital of the metropolitan area of Tuscany and Lombardy during the third trimester of gestation. The participants filled out a battery of questionnaires aimed at assessing prenatal attachment and centrality of pregnancy.ResultsAnalyses of variance showed that women with a history of elective abortion reported a higher centrality of pregnancy than women with a past therapeutic abortion. On the contrary, women with a past therapeutic abortion reported higher prenatal attachment.ConclusionElective and therapeutic abortions are different experiences that impact the way women experience a subsequent pregnancy. Future research should further investigate the psychological experience of gestation after abortion. (shrink)