In Study 1, loneliness appeared less harmful to happiness when individuals were in relatively favorable environments. Study 2 aimed to experimentally manipulate perceptions of environmental safety to establish its causal role. In this study, we particularly focused on resource availability (scarcity vs. abundance), which was identified as the top-ranked environmental threat perceived in Study 1. Recognized as one of the most fundamental challenges faced by humans [
50], scarcity significantly influences people’s heightened value placed on social belongingness [
51,
52]. Based on this, we posited that primed resource abundance would mitigate the negative association between loneliness and SWB.
3.2. Materials and Procedure
After consent, participants reported their demographic characteristics (gender, age, and relationship status). Next, embedded within several filler questions (e.g., “Where do you prefer to spend your vacation, beach or mountain?”), loneliness was measured using a 10-item version of the revised UCLA loneliness scale (e.g., “I lack companionship,” “I feel left out”) on a 7-point scale (1 =
never, 7 =
often) [
54]. 10 items (ɑ = .83) were averaged to create a single index of loneliness.
Participants were then randomly assigned to either the scarcity (
n = 43) or the abundance (
n = 41) condition. Participants were shown a series of 10 resource-related photos, presented in a randomized order within conditions. In the scarcity condition, participants viewed photos depicting scarcity (e.g., fields devastated by drought and famine), while participants in the abundance condition viewed photos depicting abundance (e.g., fields full of crops and fresh fruits). To ensure that the priming procedure successfully induced differences in the perceptions of resource availability, participants were asked to rate their perceived scarcity of resources (“How scarce do you perceive the resources at this moment?”; adapted from [
55]) on a 7-point scale ranging from 1 (
not at all) to 7 (
very much).
They then completed the 12-item Scale of Positive and Negative Experience (SPANE) as a measure of their affective well-being (Positive affect: ɑ = .83, Negative affect: ɑ = .82) [
56]. Although this scale was developed to measure affect at the trait level, we adapted it to measure state-level affect, asking participants to report their current emotions (see [
57]; 1 =
not at all, 7 =
extremely). To assess life satisfaction, we employed the Satisfaction With Life Scale (SWLS
) [
58], comprised of five items asking respondents to rate their overall life satisfaction using a 7-point scale (1 =
strongly disagree, 7 =
strongly agree, α = .87). The SWB score was computed by combining positive affect, negative affect, and life satisfaction.
3.3. Results
Manipulation check. As expected, participants reported higher levels of perceived resource scarcity in the scarcity (M = 4.48, SD = 0.98) than in the abundance condition (M = 3.52, SD = 0.91), t(82) = 4.63, p < .001, d = 1.02. There were no significant differences between the conditions in overall positive affect (p = 0.56) or negative affect (p = 0.20).
Main analysis. We examined whether the loneliness-SWB relationship varies by the primed environmental safety (scarcity vs. abundance). The moderating effect was analyzed using the PROCESS macro (Model 1, 10,000 bootstrapped samples) [
49]. The results indicated a significant main effect of loneliness on SWB,
b = -3.04,
SE = 0.79,
p < .001, CI
95 [-4.62, -1.47], while the main effect of primed environmental safety was not significant,
b = -0.11,
SE = 0.45,
p = .81, CI
95 [-1.00, 0.78]. More importantly, we found that the primed environmental safety moderated the relationship between loneliness and SWB,
b = 1.02,
SE = 0.49,
p < .05, CI
95 [0.04, 2.00]. As shown in
Figure 2, loneliness negatively predicted SWB for participants in both the scarcity and the abundance conditions, but the association was stronger in the scarcity condition (abundance condition:
b = -1.00,
SE = 0.34,
p < .01, CI
95 [-1.68, -0.32], scarcity condition:
b = -2.02,
SE = 0.36,
p < .001, CI
95 [-2.73, -1.31]).
We further examined the moderation effect for each sub-factor of SWB. As for the positive affect (PA), we found that the main effect of loneliness was statistically significant, b = -1.43, SE = 0.35, p < .001, CI95 [-2.13, -0.73], confirming a negative relationship between loneliness and PA. The main effect of primed environmental safety was not significant, b = 0.29, SE = 0.20, p = .15, CI95 [-0.11, 0.69]. The moderation effect of primed environmental safety on the loneliness-PA link was statistically significant, b = 0.68, SE = 0.22, p < .01, CI95 [0.24, 1.11]. Although loneliness was negatively related to PA in the scarcity condition, b = -0.76, SE = 0.16, p < .001, CI95 [-1.07, -0.44], this relationship disappeared in the abundance condition, b = -0.08, SE = 0.15, p = .60, CI95 [-0.38, 0.22]. As for the negative affect (NA), we found a significant main effect of loneliness, b = 0.67, SE = 0.32, p < .05, CI95 [0.03, 1.32], whereas the main effect of primed environmental safety was not significant, b = 0.22, SE = 0.18, p = .23, CI95 [-0.14, 0.58]. The moderation effect of primed environmental safety on the loneliness-NA link was not significant, b = -0.05, SE = 0.20, p = .81, CI95 [-0.45, 0.35]. As for life satisfaction, the main effect of loneliness was statistically significant, b = -0.94, SE = 0.37, p < .05, CI95 [-1.68, -0.19], whereas the main effect of primed environmental safety was not significant, b =- 0.18, SE = 0.21, p = .40, CI95 [-0.60, 0.24]. The moderation effect of primed environmental safety on the relationship between loneliness and life satisfaction was not significant, b = 0.30, SE = 0.23, p = .21, CI95 [-0.17, 0.76]. Overall, our findings suggests that experimentally primed environmental safety primarily mitigated the negative association between loneliness and PA, within the broader context of SWB.