Abstract
Planet Earth’s motion yields a 50 % day–50 % night yearly balance in every latitude or longitude, so survival must be guaranteed in very different light conditions in many species, including human. Cone- and rod-dominant vision, respectively specialized in light and darkness, present several processing differences, which are—at least partially—reflected in event-related potentials (ERPs). The present experiment aimed at characterizing exogenous attention to threatening (spiders) and neutral (wheels) distractors in two environmental light conditions, low mesopic (L, 0.03 lx) and high mesopic (H, 6.5 lx), yielding a differential photoreceptor activity balance: rod > cone and rod < cone, respectively. These distractors were presented in the lower visual hemifield while the 40 participants were involved in a digit categorization task. Stimuli, both targets (digits) and distractors, were exactly the same in L and H. Both ERPs and behavioral performance in the task were recorded. Enhanced attentional capture by salient distractors was observed regardless of ambient light level. However, ERPs showed a differential pattern as a function of ambient light. Thus, significantly enhanced amplitude to salient distractors was observed in posterior P1 and early anterior P2 (P2a) only during the H context, in late P2a during the L context, and in occipital P3 during both H and L contexts. In other words, while exogenous attention to threat was equally efficient in light and darkness, cone-dominant exogenous attention was faster than rod-dominant, in line with previous data indicating slower processing times for rod- than for cone-dominant vision.
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Notes
The conspicuous N2 at occipital sites was also analyzed despite the lack of an effect of Distractor in grand averages (and hence falling outside the scope of this study). Effects were non-significant: F(1,39) < 1 and p > 0.4 in all relevant contrasts: Light, Distractor, LightxDistractor, Electrodes(O1, Oz, O2)xLightxDistractor.
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This research was supported by the Grants PSI2014-54853-P and PSI2012-37090 from the Ministerio de Economía y Competitividad of Spain (MINECO).
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Carretié, L., Ruiz-Padial, E. Ambient Light Modulation of Exogenous Attention to Threat. Brain Topogr 29, 847–855 (2016). https://doi.org/10.1007/s10548-016-0510-6
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DOI: https://doi.org/10.1007/s10548-016-0510-6