Rationalizing the perceptual effects of spectral stimuli has been a major challenge in vision science for at least the last 200 years. Here we review evidence that this otherwise puzzling body of phenomenology is generated by an empirical strategy of perception in which the color an observer sees is entirely determined by the probability distribution of the possible sources of the stimulus. The rationale for this strategy in color vision, as in other visual perceptual domains, is the inherent ambiguity of (...) the real-world origins of any spectral stimulus. (shrink)

The present study was aimed at investigating whether and how the explicit representation of the decision outcome, framed in terms of lives saved or lost, could affect decision choices, emotional experience, and decision times in the course of a moral dilemma task. Decision outcomes were framed in a between-group design by means of smiling or injured faces depicting, respectively, the lives saved or lost with each choice. A control condition with no frame and no outcome was included. Results showed that (...) behavioral choices were highly resistant to the framing manipulation in both dilemma types. However, an overall reduction in the number of utilitarian choices and in the decision times, associated with an increase in unpleasantness during decision-making, was found, suggesting a progressive increase in aversive emotional activation favoring the rejection of utilitarian resolutions. Interestingly, at the beginning of the task, the POS group showed a delay in decision times as compared with the NOF group, specifically for footbridge-type dilemmas. This result might be interpreted as an interference effect temporarily slowing decision-making during the resolution of dilemmas in which the internal representation is spontaneously focused on the personal cost of causing intentional harm to others. (shrink)

This paper investigates relationships between procedural-memory, declarative-memory, and working-memory skills and adult native English speakers’ novel sound-category learning. Participants completed a sound-categorization task that required integrating two dimensions: one native (vowel quality), one non-native (pitch). Similar information-integration category structures in the visual and auditory domains have been shown to be best learned implicitly (e.g., Maddox, Ing, & Lauritzen, 2006). Thus, we predicted that individuals with greater procedural-memory capacity would better learn sound categories, because procedural memory appears to support implicit learning (...) of new information and integration of dimensions. Seventy undergraduates were tested across two experiments. Procedural memory was assessed using a linguistic adaptation of the serial-reaction-time task (Misyak, Christiansen, & Tomblin, 2010a, 2010b). Declarative memory was assessed using the logical-memory subtest of the Wechsler Memory Scale-4th edition (WMS-IV; Wechsler, 2009). Working memory was assessed using an auditory version of the reading-span task (Kane et al., 2004). Experiment 1 revealed contributions of only declarative memory to dimensional integration, which might indicate not enough time or motivation to shift over to a procedural/integrative strategy. Experiment 2 gave twice the speech-sound training, distributed over two days, and also attempted to train at the category boundary. As predicted, effects of declarative memory were removed and effects of procedural memory emerged, but, unexpectedly, new effects of working memory surfaced. The results may be compatible with a multiple-systems account in which declarative and working memory facilitate transfer of control to the procedural system. (shrink)