منابع مشابه
Opposite momenta lead to opposite directions
When a particle decays into two fragments, the wavefunctions of the latter are spherical shells with expanding radii. In spite of this spherical symmetry, the two particles can be detected only in opposite directions. When particles at rest decay into two fragments, the latter have opposite momenta, p1 + p2 = 0. (1) Yet, the statistical distribution of each fragment is isotropic. The same holds...
متن کاملExocentric pointing to opposite targets.
We use an exocentric pointing task to study exocentric visual directions to targets that are opposite to a pointer relative to the observer. (The apparent distance between the target and the pointer always exceeded 90 degrees of visual angle.) All pointing takes place in the horizontal plane at eye height. Observers could not see both target and pointer at a single glance. They had to look back...
متن کاملPlacebo and nocebo effects are defined by opposite opioid and dopaminergic responses.
CONTEXT Placebo and nocebo effects, the therapeutic and adverse effects, respectively, of inert substances or sham procedures, represent serious confounds in the evaluation of therapeutic interventions. They are also an example of cognitive processes, particularly expectations, capable of influencing physiology. OBJECTIVE To examine the contribution of 2 different neurotransmitters, the endog...
متن کاملPlacebo improves pleasure and pain through opposite modulation of sensory processing.
Placebo analgesia is often conceptualized as a reward mechanism. However, by targeting only negative experiences, such as pain, placebo research may tell only half the story. We compared placebo improvement of painful touch (analgesia) with placebo improvement of pleasant touch (hyperhedonia) using functional MRI and a crossover design. Somatosensory processing was decreased during placebo anal...
متن کاملOpposite-sex siblings decrease attraction, but not prosocial attributions, to self-resembling opposite-sex faces.
Contextual cues of genetic relatedness to familiar individuals, such as cosocialization and maternal-perinatal association, modulate prosocial and inbreeding-avoidance behaviors toward specific potential siblings. These findings have been interpreted as evidence that contextual cues of kinship indirectly influence social behavior by affecting the perceived probability of genetic relatedness to ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1984
ISSN: 0028-0836,1476-4687
DOI: 10.1038/308490c0