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The current study explored positive relational qualities — love, need satisfaction, sexual satisfaction— to better understand what might be alluring to on-again/off-again (cyclical) partners given that they typically report lower relational quality and functioning than non-cyclical partners (i.e., those who have not broken up and renewed). A sample of 558 young adults in current romantic relationships (27.6% in cyclical relationships) reported on Sternberg's (1997) three love components (intimacy, passion, and commitment), relationship need satisfaction (e.g., companionship, emotional involvement), and their sexual satisfaction. Results supported the bulk of research showing cyclical partners report lower relational quality — cyclical partners reported less love, need satisfaction, and sexual satisfaction. A pattern of findings regarding passion and need satisfaction regarding sexual and physical intimacy, however, suggests that cyclical partners might value the physical component of relationships more, and further, that passion might be more strongly related to global satisfaction as compared to non-cyclical partners. Overall, the value of this study is not in what differences were found but in ruling out certain explanations of what perpetuates cycling in young adult relationships. The current findings suggest the reasons individuals return to less satisfying relationships is complex and might require novel theoretical models.
The compatibility of unsynchronized interleaved uniform sampling with Sigma-Delta
analog-to-digital conversion is investigated. Let f be a bandlimited
signal that is sampled on a collection of N interleaved grids
{kT + Tn} k ∈ Z
with offsets \hbox{$\{T_n\}_{n=1}^N\subset [0,T]$}
. If the offsets Tn are
chosen independently and uniformly at random from [0,T] and if the
sample values of f are quantized with a first order Sigma-Delta
algorithm, then with high probability the quantization error \hbox{$|f(t) - \widetilde{f}(t)|$}
is at most of order
N-1log N.
People who use cannabis have an increased risk of psychosis an effect attributed to the active ingredient δ9-tetrahydrocannabinol (Δ9-THC). There has recently been concern over an increase in the concentration of Δ9-THC in the cannabis available in many countries.
To investigate whether people with a first episode of psychosis were particularly likely to use high-potency cannabis.
We collected information on cannabis use from 280 cases presenting with a first episode of psychosis to the South London & Maudsley National Health Service (NHS) Foundation Trust, and from 174 healthy controls recruited from the local population.
There was no significant difference between cases and controls in whether they had ever taken cannabis, or age at first use. However, those in the cases group were more likely to be current daily users (OR = 6.4) and to have smoked cannabis for more than 5 years (OR = 2.1). Among those who used cannabis, 78% of the cases group used high-potency cannabis (sinsemilla, ‘skunk’) compared with 37% of the control group (OR 6.8).
The finding that people with a first episode of psychosis had smoked higher-potency cannabis, for longer and with greater frequency, than a healthy control group is consistent with the hypothesis that Δ9-THC is the active ingredient increasing risk of psychosis. This has important public health implications, given the increased availability and use of high-potency cannabis.
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