This study investigated whether personal relevance influences the affective appraisal
of a desktop virtual environment (VE) in simulated darkness. In the real world,
darkness often evokes thoughts of vulnerability, threat, and danger, and may
automatically precipitate emotional responses consonant with those thoughts (fear of
darkness). This influences the affective appraisal of a given environment after dark
and the way humans behave in that environment in conditions of low lighting. Desktop
VEs are increasingly deployed to study the effects of environmental qualities and
(architectural or lighting) interventions on human behaviour and feelings of safety.
Their (ecological) validity for these purposes depends critically on their ability to
correctly address the user’s cognitive and affective experience. Previous studies
with desktop (i.e., non-immersive) VEs found that simulated darkness only slightly
affects the user’s behavioral and emotional responses to the represented environment,
in contrast to the responses observed for immersive VEs. We hypothesize that the
desktop VE scenarios used in previous studies less effectively induced emotional and
behavioral responses because they lacked personal relevance. In addition, factors
like signs of social presence and relatively high levels of ambient lighting may also
have limited these responses. In this study, young female volunteers explored either
a daytime or a night-time (low ambient light level) version of a desktop VE
representing a deserted (no social presence) prototypical Dutch polder landscape. To
enhance the personal relevance of the simulation, a fraction of the participants were
led to believe that the virtual exploration tour would prepare them for a follow-up
tour through the real world counterpart of the VE. The affective appraisal of the VE
and the emotional response of the participants were measured through self-report. The
results show that the VE was appraised as slightly less pleasant and more arousing in
simulated darkness (compared to a daylight) condition, as expected. However, the
fictitious follow-up assignment had no emotional effects and did not influence the
affective appraisal of the VE. Further research is required to establish the
qualities that may enhance the validity of desktop VEs for both etiological (e.g.,
the effects of signs of darkness on navigation behaviour and fear of crime) and
intervention (e.g., effects of street lighting on feelings of safety) research.