Nicotine vs. Ethanol Discrimination: Extinction and Spontaneous Recovery of Responding

Studies regarding extinction and spontaneous recovery of the discriminative stimulus effects of drugs are limited. Eight rats were initially trained to discriminate nicotine (0.4 mg/kg) vs. ethanol (800 mg/kg). For four rats, itraperitaneal (IP) administrations of nicotine fifteen minutes prior to fifteen-minute training sessions served as a discriminative stimulus (SD) for predicting food-reinforced lever pressing (VI-1 min). On other sessions ethanol functioned in predicting nonreinforcement (SA). The stimulus roles of the drugs were counterbalanced for the remaining four rats. SA and SD sessions alternated quasi-randomly with two daily sessions at 1000 and 1400 hours. Discriminative control was not disrupted following ten extinction sessions under a non-drug/saline condition, but was disrupted following extinction sessions under the original training drugs. Instances of spontaneous recovery (SR) occurred throughout extinction under the drug condtions. There was no evidence for SR two weeks following extinction, but partial recovery four weeks following the final extinction phase. Contextual status (context renewal) had neither a restorative or disruptive impact on extinguished or discriminated responding, respectively. These results support and extend the limited number of other studies by demonstrating extinction and spontaneous recovery of responding discriminated by two distinct drugs. Some theoretical interpretations regarding history effects and training in the context of drug discrimination are entertained.     

Willingness of Mentally Ill Individuals to Sign Up for a Novel Proposal to Prevent Firearm Suicide

The study goal was to determine whether a significant number of high suicide risk individuals would confidentially put their own names onto a list to prevent future gun purchases. An anonymous written survey was administered in an inpatient psychiatric unit and two outpatient psychiatric clinics at an academic medical center. Two hundred forty individuals were approached to fill out the survey, of whom 200 (83.3%) did so. Forty‐six percent of participants stated that they would put their own name onto the list. This novel suicide prevention proposal, a Do‐Not‐Sell List, would appeal to many people at high risk for suicide.     

Displacement activities as a behavioral measure of stress in nonhuman primates and human subjects

Traditionally, research on human stress has relied mostly on physiological and psychological measures with a relatively minor emphasis on the behavioral aspects of the phenomenon. Such an approach makes it difficult to develop valid animal models of the human stress syndrome. A promising approach to the study of the behavioral correlates of stress is to analyze those behavior patterns that ethologists have named displacement activities and that, in primates, consist mostly of self-directed behaviors. In both nonhuman primates and human subjects, displacement behavior appears in situations characterized by social tension and is likely to reflect increased autonomic arousal. Pharmacological studies of nonhuman primates have shown that the frequency of occurrence of displacement behavior is increased by anxiogenic compounds and decreased by anxiolytic drugs. Ethological studies of healthy persons and psychiatric patients during interviews have found that increased displacement behavior not only correlates with a subjective feeling state of anxiety and negative affect but also gives more veridical information about the subject's emotional state than verbal statements and facial expression. The measurement of displacement activities may be a useful complement to the physiological and psychological studies aimed at analyzing the correlates and consequences of stress.     

Desirable but not smart: preference for smarter romantic partners impairs women's STEM outcomes

Although women today excel in many areas of society, they are often underrepresented in the traditionally male‐dominated fields of Science, Technology, Engineering, and Math (STEM). The present research examined whether traditional romantic partner preferences—specifically, a desire to date partners who are smarter than oneself—affects women's tendency to minimize their intelligence in STEM fields when pursuing romantic goals. Women (but not men) who preferred smarter romantic partners showed worse math performance (Studies 1–2), less identification with math (Study 2), and less interest in STEM careers (Study 3) when the goal to be romantically desirable was activated. A meta‐analysis across studies supported results. This research thus demonstrates that partner preferences influence women's STEM outcomes in response to romantic goal pursuit.     

Relationship with the mother modulates the response of yearling Japanese macaques (Macaca fuscata) to the birth of a sibling

The authors investigated the changes induced by the birth of a sibling in the relationship of 1-year-old Japanese macaques (Macaca fuscata) with their mothers and group companions. After the birth of a sibling, mother-yearling contact, proximity, and grooming decreased dramatically. Yearlings responded to such a reduction in maternal care in either of 2 radically different ways. Yearlings either sought attention from group companions and showed no sign of depression or did not compensate for the mother's reduced availability and became depressed. The modality of response was predicted by the quality of the relationship with the mother before the sibling birth. Yearlings that had spent a larger amount of time in contact with their mothers were less likely to become depressed. Security of the attachment relationship with the mother may be the factor mediating the link between the time in contact and the yearling's response to the birth of a sibling.