It has been suggested that an increase firing rate of noradrenergic neurons of the locus ceruleus is responsible for the opiate withdrawal syndrome. However, lesion studies have indicated that the noradrenergic neurons of the locus ceruleus are not essential for either the expression or suppression by clonidine of opiate withdrawal. The present study was designed to determine the effect of the ...

The opponent-process theory of motivation postulates that motivational stimuli activate a rewarding process that is followed by an opposed aversive process in a homeostatic control mechanism. Thus, an acute injection of morphine in nondependent animals should evoke an acute rewarding response, followed by a later aversive response. Indeed, the tegmental pedunculopontine nucleus (TPP) mediates t...

Risk aversion has been shown to have adverse effects on agents’ bidding. In private value auctions, risk aversion induces more aggressive bidding, whenever the number of participants remain unchanged. Risk aversion may also prevent agents from entering the auction, in the first place, if a certain outcome is available, which lessens competition and, eventually the agent’s bids. Moreover, if bid...

Human decision making under risk and uncertainty may depend on individual involvement in the outcome-generating process. Expected utility theory is silent on this issue. Prospect theory in its current form offers little, if any, prediction of how or why involvement in a process should matter, although it may offer ex post interpretations of empirical findings. Well-known findings in psychology ...

The parabrachial nucleus (PBN) has been proposed as the associative site for conditioned taste aversion. Previous evidence has shown that functional blockade of the PBN by tetrodotoxin (TTX) produces retrograde disruption of lithium-induced taste aversions in rats. However, given the PBN role in processing visceral cues and the long duration of the lithium-induced aversive effects, an interpret...

Entrepreneurs face significant non-diversifiable idiosyncratic business risks. In a dynamic incomplete-markets model of entrepreneurial finance, we show that such risks have important implications for their interdependent consumption/saving, portfolio choice, financing, investment, and endogenous default/cash-out decisions. Even though more risk-averse entrepreneurs default earlier for given de...

This paper shows that existing estimates of labor supply elasticities place a tight upper bound on risk aversion in an expected utility model. I derive a formula that relates the coefficient of relative risk aversion (γ) to the ratio of the income elasticity of labor supply to the wage elasticity, holding fixed the degree of complementarity between consumption and leisure. The degree of complem...

Identification and analysis of farmers’ vulnerability associated with their risk aversion degree is one of the necessary requirements for planning and reducing impacts of drought in Iran. So, this study was investigated three risk vulnerability parameters (economic, social and technical) among wheat farmers categorized in accordance with their risk aversion degree in the Mashhad County (Iran) b...

This note shows that for two inequality averse social welfare functions, if one is more inequality averse than the other, the household preference induced by optimally allocating aggregate bundles according to this social welfare function is more risk averse than the other. We present examples showing that this comparative static can be reversed if inequality aversion is dropped. We show that t...

Downward phase of dose-response morphine converted U shape curve was chosen as a base for investigating the effects of different doses of naloxone (0.05-0.4 mg/Kg) on morphine reward/aversion properties using place preference method. First, male Wistar rats (200-220 g) were received morphine (1-7.5 mg/Kg) for place conditioning and marginal dose of morphine (5 mg/Kg) calculated by GraphPad soft...