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Germination of plants is one of the most important stages during their growth which is often influenced by environmental stresses, especially drought and salinity. This study was conducted to investigate the effects of salinity and drought on seed germination and growth of Lathyrus sativa. The experiment was laid out in a completely randomized design with factorial arrangement in 4 replications. Salinity treatments were 0, 2, and 4 dS/m and drought treatments included 0, 0.4, 0.8, 1.2 MPa. Salinity and drought treatments were prepared by using sodium chloride and polyethylene glycol 6000, respectively. The results showed that salinity and drought stresses decreased germination percentage, root and radicle length.

Today the world faces some of the most unprecedented environmental challenges ever seen. Many of these challenges are driven by human behaviour. Subsequently, solutions involving human behavioural change are essential to mitigate the environmental threats faced. Although many people express concern about environmental issues and report intentions to engage in pro-environmental activities, often these two factors do not align with behaviour. One possibility for this discrepancy is that environmental goals are not always salient during decision-making contexts. Based on theories which propose that goals can be automatically activated, this thesis aims to investigate whether environmental goals can be automatically activated to produce pro-environmental goal consistent behaviour. It also aims to explore some of the psychological mechanisms involved in the pursuit of environmental goals. These aims are explored across five quantitative experiments which form the three empirical chapters of this thesis. The first empirical chapter comprises three experiments which examine whether environmental goal priming influences environmental behaviour and whether goal pursuit is driven by changes in the automatic evaluation of goal relevant objects. The second empirical chapter investigates whether environmental goal priming enhances attention to environmental product labelling. Lastly, the third empirical chapter explores the efficacy of behavioural feedback as a tool to enhance environmental behaviour. The findings from this thesis reveal that environmental goals can be automatically activated and that this can lead to behaviour consisted with the primed goal. Environmental goals also exhibit features typical of goal pursuit, such as persistence over time. This thesis also provides evidence that environmental labelling is partly goal-dependent, as participants who report stronger motivation to protect the environment devote greater eye gaze towards environmental labelling. Finally, this thesis provides evidence that negative feedback is an effective tool in promoting compensatory environmental behaviour. A key conclusion of this research is that while environmental goals are important, to be effective in promoting pro-environmental behaviour they must be salient during decision-making. Techniques which focus on activating environmental goals may therefore be an important tool to facilitate more sustainable consumer behaviour.

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Individualist and collectivist cultural approaches describe the relationship between an individual and his or her social surroundings. the current study had a two-fold purpose. the first was to investigate whether Brazilians, like other collective peoples, displayed more group self-representations, categorized items more relationally and paid more attention to context than Americans. the second purpose of this study was to investigate if counter-cultural primes played a role in activating either collective or individual selves. Both American (n = 100) and Brazilian (n = 101) participants were assigned either to a no-prime condition or a counter-cultural prime condition and then were asked to rate emotion cartoons, categorize items, complete the Twenty Statement Test (TST), and choose a representative object. As expected, unprimed Brazilian participants displayed more collectivist patterns on emotional (F[1,196] = 10.1, p = .001, ?²= .049; F[1,196] = 7.9, p = .006, ?²= .038; F[1,196] = 9.0, p = .005, ?²= .044) and cognitive (F[1, 196] = 6.0, p < .01, ?² = .03) tasks than Americans. However, Brazilians offered more individualist self-representations (F[1, 195] = 24.0, p < .001, ?² = .11) than American participants. Priming only had a marginal effect on item categorization (F[1,194] = 3.9, p = .051, ?² = .02). Understanding such cultural differences is necessary in the development of clinicians’ multicultural competence. Therefore, these findings, along with the strengths and limitations of this study and suggestions for future research, are discussed.

<div>Background: Structural priming – a tendency to reuse previously encountered sentence structures – has been shown to facilitate production of sentences in persons with aphasia (PWA). However, the task-specific and person-specific factors that modulate the strength of priming effects in PWA remain largely unknown. This study examined (a) if PWA and healthy older adults (HOA) demonstrate improved production of passive sentences following comprehension of passive (as opposed to active) prime sentences, (b) whether repeated use of a verb between a prime and target sentence boosts priming effects, and (c) whether individual participants’ deficits in syntactic processing modulate degrees of priming effects.</div><div><br></div><div>Method: The participants (16 HOA and 13 PWA) completed a comprehension-to-production structural priming task. For prime sentences, they completed a sentence-to-picture matching comprehension task. Then, they described a target action picture, which could be described in an active or passive sentence structure. For half of the prime-target pairs, the verb was repeated to compare the priming effects in the same vs. different verb prime conditions (i.e., lexical boost). To analyze individual variability, we examined if PWA’s scores on clinical measures of syntactic comprehension and production were associated with a positive priming effect.</div><div><br></div><div>Results: Both HOA and PWA showed increased production of passive sentences following comprehension of passive primes, although the priming effect was reduced for PWA. A significant lexical boost was found in HOA, but not for PWA. Within PWA, individuals with higher scores on clinical measures of syntactic production, but not syntactic comprehension, showed a significant priming effect.</div><div><br></div><div>Conclusion: The findings suggest that implicit comprehension-to-production structural priming is preserved in aphasia and that lexically-mediated structural priming may not be critical to effectiveness of structural priming in aphasia. Preliminary results indicate that individuals’ syntactic skills in the domain of production may need to be considered when comprehension-to-production priming is used to improve sentence production.</div>

The characteristics feature of neurotoxicity is a definable lesion which can account for observed deficits, corresponding to loss of nuclei or axonal fibers normally comprising a specific pathway or tract. However, with ontogenetic lesions, the operative definition fails. In rats lesioned as neonates with 6-hydroxydopamine (6-OHDA), near-total destruction of dopamine-(DA-) containing nerves is produced, and this itself is definable. However, the most prominent feature of rats so-lesioned is the DA receptor supersensitivity (DARSS) that develops and then persists throughtout the lifespan. DA D1 receptors show overt supersensitivity to agonists producing vacuous chewing movements (VCMs), while D1 receptors associated with locomotor activity have a latent supersensitivity that must be unmasked by repeated D1 or D2 agonist treatments - a 'priming' phenomenon. This D1 DARSS is not usually associated in either a change in D1 receptor number (Bmax) or affinity (Kd). In contrast to D1 DARSS, D2 receptors are not so predictably supersensitized by a lession of DA neurons. In reality, the permanently exaggerated response to an agonist by supersensitized receptors is per se a manifestation of neurotoxicity. Despite dramatic behavioral responses mediated by supersensitized receptors, DARSS has not been easy to correlate with enhanced production of second messengers or early response genes. Altered signaling (i.e., neuronal cross-talk) in defined pathways may represent the mechanism that produces so-called receptor supersensitization. Longlived agonist-induced behavioral abnormality, with or without anatomic evidence of a neuronal lesion, is one of the products of DA D1 receptor supersensitization - it self an index of neurotoxicity.

Repeated treatment in ontogeny with the dopamine (DA) D2/D3 receptor agonist quinpirole is associated with enhanced quinpirole-induced yawning and other behaviors such as vacuous chewing, vertical jumping, and antinociception. To determine if the reputedly DA D3 agonist (±)-2-(dipropylamino)-7-hydroxy-1,2,3,4-tetrahydronaphthalene (7-OH-DPAT) would prime for yawning in a manner analogous to that for quinpirole, rats were treated for the first 11 days after birth with an equimolar dose of either quinpirole or 7-OH-DPAT (195.4 nmol/kg/day) and tested for agonist-induced yawning in adulthood. While enhanced quinpirole-induced and 7-OH-DPAT-induced yawning was observed in quinpirole-primed rats, acute treatments with quinpirole and 7-OH-DPAT did not produce an enhanced yawing response in 7-OH-DPAT-'primed' rats. Our findings indicate that 7-OH-DPAT, unlike quinpirole, does not prime for quinpirole- or 7-OH-DPAT-induced yawning in rats.

The purpose of the present study was to investigate whether manipulated and biographical parent disengagement were associated with sexually risky attitudes and intentions. College women (N = 140) completed an online experiment in which they were asked to recall a time when one of their parents (father or mother) was either engaged or disengaged, write about it, and then complete a series of inventories measuring their sexual attitudes, sexual intentions, and biographical information. Experimental data were analyzed using a 2 (Parent Prime: father or mother) × 2 (Engagement Prime: engaged or disengaged) ANCOVA, with the Mini-K (Figueredo et al., Developmental Review 26:243–275, 2006) as the covariate. Experimental results showed a significant main effect for the engagement prime on sexually risky attitudes and intentions, F(1, 98) = 4.34, p =.04, ηpartial2 =.04. Women who recalled a time when a parent was disengaged (M = 24.25, SD = 6.84), endorsed more sexually risky attitudes and intentions than those who recalled a time when a parent was engaged (M = 21.83, SD = 7.31). Consistent with these results, correlational analyses also revealed that childhood and current biographical parent disengagement were significantly associated with sexually risky attitudes and intentions. Results are discussed from an evolutionary perspective using Life History Theory.

Visual information can be processed by humans both consciously and unconsciously. Under conscious conditions the humans are aware of the input, and thus can process it according to their goals. However in unconscious conditions participants remain unaware of the input, as evident from their chance accuracy when judging about the input. It has been shown that although participants may not consciously perceive subliminal input, the input can be processed automatically. Masked priming is an experimental paradigm to investigate unconscious visual processing. In this paradigm the input is presented for a very brief duration, often temporally sandwiched between a pre- and a post-mask. In this thesis, I and we mostly applied the masked-priming paradigm to study human unconscious visual processing using words and face images as input. We conducted five studies to understand unconscious visual processing and compare it with conscious processing. Our first study is about the accurate measurement of the visibility of subliminally presented visual input. In the second study, we provide a test-case for the embodied cognition theory using subliminal words. The third study is concerned with conflict control under aware and unaware conditions. In our fourth study, we tried to understand the role of subcortical structures in subliminal face processing. The fifth study is concerned with relations between space and valence priming effects. Together our findings further the understanding of unconscious and conscious visual processing.