Perceptual impulsions and unfamiliar solids: Evidence from a drawing task

Previous work (Dziurawiec & Derȩgowski, 1992) has shown that children's distorted drawings of animal models may be explained by the child's tendency to depict typical contours, the outlines of the surfaces which undergo pronounced change. The present paper investigates whether the typical contours notion can be extended to purely geometric solids. Results from a drawing task by children aged nine and eleven years, using unfamiliar models of varying complexity, indicate that the tendency to draw in perspective increases with the increase in figure complexity for both age groups, but younger children show a greater reliance on typical contours than older children. Recasting the data from previous drawing experiments (Bartel, 1928/1958; Cox, 1986) further confirms the utility of the typical contours approach. Finally, the advantages of such an approach over that of canonicity (cf. Palmer, Rosch & Chase, 1981) for the representation of solids are elaborated.     

Relationships among Facial,Prosodic, and Lexical Channels of Emotional Perceptual Processing

This study was designed to address the issue of whether there is a general processor for the perception of emotion or whether there are separate processors. We examined the relationships among three channels of emotional communication in 100 healthy right-handed adult males and females. The channels were facial, prosodic/intonational, and lexical/verbal; both identification and discrimination tasks of emotional perception were utilised. Statistical analyses controlled for nonemotional perceptual factors and subject characteristics (i.e. demographic and general cognitive). For identification, multiple significant correlations were found among the channels. For discrimination, fewer correlations were significant. Overall, these results provide support for the notion of a general processor for emotional perceptual identification in normal adult subjects.     

Perceptual grouping and distance estimates in typical and atypical development: comparing performance across perception, drawing and construction tasks

Perceptual grouping is a pre-attentive process which serves to group local elements into global wholes, based on shared properties. One effect of perceptual grouping is to distort the ability to estimate the distance between two elements. In this study, biases in distance estimates, caused by four types of perceptual grouping, were measured across three tasks, a perception, a drawing and a construction task in both typical development (TD: Experiment 1) and in individuals with Williams syndrome (WS: Experiment 2). In Experiment 1, perceptual grouping distorted distance estimates across all three tasks. Interestingly, the effect of grouping by luminance was in the opposite direction to the effects of the remaining grouping types. We relate this to differences in the ability to inhibit perceptual grouping effects on distance estimates. Additive distorting influences were also observed in the drawing and the construction task, which are explained in terms of the points of reference employed in each task. Experiment 2 demonstrated that the above distortion effects are also observed in WS. Given the known deficit in the ability to use perceptual grouping in WS, this suggests a dissociation between the pre-attentive influence of and the attentive deployment of perceptual grouping in WS. The typical distortion in relation to drawing and construction points towards the presence of some typical location coding strategies in WS. The performance of the WS group differed from the TD participants on two counts. First, the pattern of overall distance estimates (averaged across interior and exterior distances) across the four perceptual grouping types, differed between groups. Second, the distorting influence of perceptual grouping was strongest for grouping by shape similarity in WS, which contrasts to a strength in grouping by proximity observed in the TD participants.     

Vahid,Burge, and Perceptual Entitlement

Hamid Vahid criticizes Tyler Burge's account of perceptual entitlement. Vahid argues that Burge's account fails to satisfy a criterion of adequacy that any correct account of perceptual warrant must satisfy. According to Vahid, a correct account of perceptual warrant must allow for perceptual beliefs which are produced by a properly functioning perceptual system yet which lack warrant. The present article argues that Vahid's critique of Burge fails. It presents numerous examples of such beliefs that are consistent with Burge's account of perceptual entitlement.     

Experiences,Seemings, and Perceptual Justification

Several philosophers have distinguished between three distinct mental states that play a role in visual recognition: experiences, propositional seemings, and beliefs. I clarify and offer some reasons for drawing this three-fold distinction, and I consider its epistemological implications. Some philosophers have held that propositional seemings always confer prima facie justification, regardless of a particular seeming's relation to experience. I add to criticisms of this view in the literature by arguing that it fails to solve a version of the ‘problem of the speckled hen’. A more promising view holds that propositional seemings confer justification only when appropriately related to experiences. I offer advice for developing such an account.     

Documentaries,Docudramas, and Perceptual Beliefs

The main accounts of the documentary in contemporary analytic aesthetics have difficulties in dealing with the distinction between documentaries and docudramas. On the one hand, the assertion-based accounts proposed by Noël Carroll, Trevor Ponech, and Carl Plantinga cannot properly differentiate documentaries from docudramas. On the other hand, Gregory Currie's account can do so by relying on the notion of trace, but this involves an undesirable side effect, namely, the exclusion, from the documentary, of those documentaries that do not include traces of their subjects, as, for instance, documentaries that resort to reenactment. Is there a way to exclude docudramas from the documentary without also excluding other films that we usually treat as documentaries? This article affirmatively answers by relying on the notion of perceptual belief, that is, a belief that one can form by endorsing the demonstrative content of one's perception. While documentaries primarily involve the formation of perceptual beliefs, docudramas invite us to form nonperceptual beliefs by primarily involving the formation of perceptual imaginings. That is why docudramas are not documentaries. By contrast, a documentary that resorts to reenactment primarily involves the formation of perceptual beliefs, namely, perceptual beliefs about the reenactment itself.     

Perceptual Error,Conjunctivism, and Husserl

Claude Romano (2012) and Andrea Staiti (2015) have recently discussed Husserl’s account of perception in relation to debates in current analytic philosophy between so-called “conjunctivists” and “disjunctivists”. Romano and Staiti offer strikingly different accounts of the nature of illusion and hallucination, and opposing readings of Husserl. Romano thinks hallucinations and illusions are fleeting, fragile phenomena, while Staiti claims they are inherently retrospective phenomena. Romano reads Husserl as being committed to a form of conjunctivism that Romano rejects in favour of a version of disjunctivism. Staiti, by contrast, claims that, from a Husserlian viewpoint, conjunctivism and disjunctivism are equally untenable. I suggest that both Romano and Staiti offer implausible accounts of illusions and hallucinations, and deliver premature verdicts on Husserl in relation to the analytic debates on perception.     

The influence of handedness on profile and line drawing directionality in children,young, and older normal adults

One hundred twenty-two normal subjects--children, young and older adults (77 right-handers and 45 left-handers)--performed two drawing tasks in order to study their directionality trends. The first task consisted of drawing the profile of a face and in the second task subjects had to link two points in order to draw a line. The analysis of the drawing directionality revealed a significant effect of the age when right-handers drew profiles whereas this effect reached significance in left-handed subjects only when drawing lines. Left- and right-handers' performances across the two tasks were found to significantly differ. Results are discussed in terms of hemispheric and environmental factors.     

Perceptual differences in gender ideals among heterosexual and homosexual males and females

The relationship between sexual oreintation (heterosexuality vs. homosexuality) and perceptions of self, ideal male, and ideal female was investigated. Using the Androgyny scale of the Bex Sex Role Inventory [S. L. Bem, “The Measurement of Psychological Androgyny,” Journal of Consulting and Clinical Psychology, 1974, 42(2), 155–162] data were analyzed for 144 male and female subjects. The results indicated that homosexual, compared to heterosexual, subjects were least likely to stereotype their three perceptions, yet showed a significant difference between their perceived self and their same-sex ideals. Moreover, homosexual females were the only group to show a significant difference between their perceptions of the ideal male and ideal female, and to categorize all their perceptions within an androgynous range. Furthermore, they were least likely to utilize traditional sex roles in organizing their perceptions. Finally, the homosexual males, although not as extreme as heterosexual males, still maintain a slight tendency to stereotype their perception of an ideal male.     

Perceptual asymmetries in normal children and children with attention deficit/hyperactivity disorder

Perceptual asymmetries in normal right-handed children (7-12 years of age) and children with attention deficit/hyperactivity disorder (ADHD), combined type, were investigated using various chimeric stimuli in free-viewing conditions. In the face-matching task, participants indicated which of two symmetrical face chimeras more closely resembled the original; in the chimeric faces task, participants indicated which of a pair of faces appeared happier; and in the grey scales task participants indicated which of two shaded rectangles appeared to be darker overall. Leftward biases were found for normal children with no effects of age. Contrary to expectations, normal leftward biases were also found for ADHD children in the face-matching and the chimeric faces tasks; however, a significant leftward bias was not observed in the grey scales task. The absence of anomalous perceptual bias in ADHD children on these purely perceptual tasks, suggests that anomalous perceptual asymmetries observed in other tasks (line bisection and cancellation tasks) may have been confounded by the motor response, and/or the explicit spatial components of those tasks.