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Philip K. Dick was a seminal science fiction author with much interest in theological and philosophical questions. This essay is interested in what Dick’s novel Counter-Clock World expresses about two themes: “time and eternity” along with “omniscience”. The purpose is to come closer to an understanding of the theology expressed in the novel, in relation to the theology of Augustine and Eriugene, who are two of the theologians mentioned in the novel. In the analysis a hybrid text-centered method of hermeneutics is used with some regards to the authors point of view, a method inspired by professor of literature Torsten Pettersson.  The result of the analysis shows that the resurrection described in the novel is central in the matter of time perception. Augustine’s presentism is clear. The characters have been part of eternity and God while being dead, which is related to Eriugene’s thought about the close relationship between the created and the uncreated. The contemplative knowledge of God is recurrent. The resurrected have received a part of God’s secret and by extension his omniscience. The head character, the anarch Thomas Peak, is a clear example of this. Moreover, Augustine’s thought of the divine gaze is recurrent.  The essay argues that academic scholars can find inspiration from fiction. Fiction authors have the possibility to explore theological questions in a way that scholars may have a hard time doing. This because there are neither requirements for coherence in fiction nor a need for responsibility in terms of the consequences of the concepts being explored. This is a creativity that can give fuel to a stagnated theology.

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This work examines the effect of participants' gender and handedness on the perception of short intervals of time. The time estimation task consisted of an empty production procedure with forty trials at each of four intervals of one, three, seven, and twenty seconds. The four target intervals represent a natural logarithmic progression and a series that bracket important temporal thresholds. The order of presentation of those intervals was randomized across participants but yoked across the sexes in each of the respective dominant hand groups. The two between-subject factors, with two levels each, were sex and handedness. Participants produced forty estimates at each of the required intervals, which was the first within-subject factor, estimated interval being the other. T-tests were conducted on the dependent measures, the time estimates in terms of their variability and their central tendency with respect to the target duration. If handedness plays a significant role in timing, this may indicate differences between hemispheric functioning as a possible causal mechanism. If there is cerebral asymmetry in time perception, namely if one hemisphere is more competent regarding time perception, accuracy in judging duration should be higher for the contralateral hand. The results of the present study indicated that there are no significant differences in performance between right-handed and left-handed participants, or between male and female participants, in the estimation of short intervals of time.

Research suggests a relationship between time distortion and mental health disorders, and the present study sought to examine this proposition. Prior research suggests that negative emotions are associated with the slowing down of time. Because mental health disorder symptomology is associated with more negative emotions, it was predicted that negative emotions would mediate the relationship between mental health disorder symptomology and time distortion. A survey was administered to university students that contained measures of anxiety, depression, emotional experiences, and time perception. Mental health disorder symptomology was found to be related to negative emotions. However, negative emotions and mental health disorder symptomology were not related to time distortion. Thus, the proposed mediation model was not supported. The primary reason for these results likely lies in the challenges of measuring time distortion. Despite the lack of effects found in the present study, investigating this topic is crucial for understanding the perceptual experiences of those with mental health disorders.

The experiments described in this thesis use psychophysical techniques and human observers to investigate temporal processing in the millisecond range. The thesis contains five main sections. Introductory chapters provide a brief overview of the visual and auditory systems, before detailing our current understanding of duration processing. During the course of this review, several important questions are highlighted. The experiments detailed in Chapters 8-11 seek to address these questions using the psychophysical techniques outlined in Chapter 7. The results of these experiments increase our understanding of duration perception in several areas. Firstly, Experiments 1 and 2 (Chapter 8) highlight the role of low level stimulus features: even when equated for visibility stimuli of differing spatial frequency have different perceived durations. Secondly, a psychophysical hypothesis arising from the ¿duration channels¿ or ¿labelled lines¿ model of duration perception is given strong support by the adaptation experiments detailed in Chapter 9 and 10. Specifically, adaptation to durations of a fixed temporal extent induces repulsive duration aftereffects that are sensory specific and bandwidth limited around the adapted duration. Finally Chapter 11 describes the results of experiments designed to probe the processing hierarchy within duration perception by measuring the interdependency of illusions generated via duration adaptation and via multisensory cue combination. The results of these experiments demonstrate that duration adaptation is a relatively early component of temporal processing and is likely to be sub served by duration selective neurons situated in early sections of the visual and auditory systems.

This thesis documents a series of experiments designed to investigate the mechanisms subserving sub-second duration processing in humans. Firstly, duration aftereffects were generated by adapting to consistent duration information. If duration aftereffects represent encoding by neurons selective for both stimulus duration and non-temporal stimulus features, adapt-test changes in these features should prevent duration aftereffect generation. Stimulus characteristics were chosen which selectively target differing stages of the visual processing hierarchy. The duration aftereffect showed robust interocular transfer and could be generated using a stimulus whose duration was defined by stimuli invisible to monocular mechanisms, ruling out a pre-cortical locus. The aftereffects transferred across luminance-defined visual orientation and facial identity. Conversely, the duration encoding mechanism was selective for changes in the contrast-defined envelope size of a Gabor and showed broad spatial selectivity which scaled proportionally with adapting stimulus size. These findings are consistent with a second stage visual spatial mechanism that pools input across proportionally smaller, spatially abutting filters. A final series of experiments investigated the pattern of interaction between concurrently presented cross-modal durations. When duration discrepancies were small, multisensory judgements were biased towards the modality with higher precision. However, when duration discrepancies were large, perceived duration was compressed by both longer and shorter durations from the opposite modality, irrespective of unimodal temporal reliability. Taken together, these experiments provide support for a duration encoding mechanism that is tied to mid-level visual spatial processing. Following this localised encoding, supramodal mechanisms then dictate the combination of duration information across the senses.

Many experiences in our daily lives are temporally structured, enabling prediction of events that will occur in the future. We can anticipate upcoming subway stops during our daily commute, or plan multiple steps ahead when cooking a meal we have made many times. Although sequences of events in daily life can be multiple steps long, like the stations along a subway line, it is unknown how extended temporal structure enables predictions over multiple timescales. The three studies reported in this dissertation investigate how extended temporal structure is flexibly represented in memory and in the brain to guide multistep prediction. Chapter 1 demonstrates that memory for temporal structure is enhanced with memory consolidation, enabling more efficient judgements about predictable future events over time. Chapter 2 shows that temporal structure is represented bidirectionally and hierarchically across the hippocampus and across visual regions during multistep anticipation. Finally, Chapter 3 addresses how internal models are updated when regularities in our environment change: the hippocampus rapidly reconfigures memories of temporal structure in response to learning new information, which supports the planning of novel trajectories. Together, the studies presented in this dissertation shed light on how we represent internal models of the world that span multiple timescales to guide adaptive behavior.

This thesis presents a series of human psychophysical experiments designed to examine the interaction between the reliability of spatial form information and the neural mechanisms responsible for the processing of sub-second durations. Duration discrimination sensitivity was found to be lower when event durations were defined by stimulus characteristics that caused reductions in spatial form sensitivity. This form-duration sensitivity coupling persisted across stimuli defined both by crossed and uncrossed retinal disparity and within monocularly visible texture-defined stimuli. The interaction was also observed when spatial form was degraded by physical instability within shape borders, and when physically stable borders became perceptually unstable. These effects could not be attributed to artefacts of stimulus visibility, temporal coherence or stimulus size. Adaptation experiments generated aftereffects of perceived duration within stimuli whose durations were defined solely by retinal disparity, providing the first demonstration of duration selectivity within exclusively cortical duration encoding mechanisms. The selectivity of these aftereffects was then investigated using adapting and testing durations defined by matching or opposing retinal disparities. Duration aftereffects were maximal when adapt and test disparities were matched. However, there was partial transfer of duration aftereffects across large changes in retinal disparity, implicating contributions from higher-level extra-striate mechanisms. Collectively, these experiments provide support for duration processing mechanisms that are inextricably linked to the mechanisms underpinning spatial processing across multiple levels of the visuo-spatial hierarchy.

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