Clouds, shadows, or twilight? Mayfly nymphs recognise the difference

1. We examined the relative changes in light intensity that initiate night-time locomotor activity changes in nymphs of the mayfly, Stenonema modestum (Heptageniidae). Tests were carried out in a laboratory stream to examine the hypothesis that nymphs increase their locomotion in response to the large and sustained reductions in relative light intensity that take place during twilight but not to short-term daytime light fluctuations or a minimum light intensity threshold. Ambient light intensity was reduced over a range of values representative of evening twilight. Light was reduced over the same range of intensities either continuously or in discrete intervals while at the same time nymph activity on unglazed tile substrata was video recorded. 2. Nymphs increased their locomotor activity during darkness in response to large, sustained relative light decreases, but not in response to short-term, interrupted periods of light decrease. Nymphs did not recognise darkness unless an adequate light stimulus, such as large and sustained relative decrease in light intensity, had taken place. 3. We show that nymphs perceive light change over time and respond only after a lengthy period of accumulation of light stimulus. The response is much lengthier than reported for other aquatic organisms and is highly adaptive to heterogeneous stream environments

Featuring Gregory M. Nixon’s Work with Commentaries & Responses. HOLLOWS OF MEMORY. From Individual Consciousness to Panexperientialism and Beyond

Table of Contents Article Preface/Introduction Gregory M. Nixon 213-215 From Panexperientialism to Conscious Experience: The Continuum of Experience Gregory M. Nixon 216-233 Hollows of Experience Gregory M. Nixon 234-288 Myth and Mind: The Origin of Human Consciousness in the Discovery of the Sacred Gregory M. Nixon 289-337 ………………………………………………………………………………………………….. Commentary Brief Comment on Gregory Nixon’s Hollows of Experience: Derrida Frederick D. Abraham 338-341 Playing With Your Food: Review of “Hollows of Experience” by Greg Nixon William A. Adams 342-345 Brief Commentary on Nixon's Three Papers Roger Cook 346-347 Commentary on Nixon's From Panexperientialism to Individual Self Consciousness Stephen Deiss 348-349 Nixon on Conscious and Non-conscious Experience Gordon Globus 350-351 Commentary on Nixon's From Panexperientialism to Individual Self Consciousness Syamala Hari 352-353 The Predictive Mind and Mortal Knowledge Marc Hersch 354-368 Consciousness as Shared and Categorized Result of Experience Tim Jarvilehto 369-371 Brief Comment on Gregory Nixon’s Myth and Mind Joseph McCard 372-372 Commentary on Nixon's Three Papers Marty Monteiro 373-376 Brief Commentary on Nixon's “From Panexperientialism to Conscious Experience” Richard W Moodey 377-378 Hollows of a Science of Consciousness? Alfredo Pereira Jr. 379-380 Comment on Gregory Nixon’s “From Panexperientialism to Individual Self Consciousness” Steven M. Rosen 381-382 Consciousness, Non-conscious Experiences and Functions, Proto-experiences and Protofunctions, and Subjective Experiences Ram L. P. Vimal 383-389 ………………………………………………………………………………………………….. Response to Commentary Response to the Commentary of Frederick D. Abraham Gregory M. Nixon 390-390 Response to the Commentary of William A. Adams Gregory M. Nixon 391-392 Response to the Commentary of Syamala Hari Gregory M. Nixon 393-394 Response to the Commentary of Marc Hersch Gregory M. Nixon 395-398 Response to the Commentary of Joseph McCard Gregory M. Nixon 399-399 Response to the Commentary of Steven M. Rosen Gregory M. Nixon 400-40

Featuring Gregory M. Nixon’s Work with Commentaries & Responses. HOLLOWS OF MEMORY. From Individual Consciousness to Panexperientialism and Beyond

Table of Contents Article Preface/Introduction Gregory M. Nixon 213-215 From Panexperientialism to Conscious Experience: The Continuum of Experience Gregory M. Nixon 216-233 Hollows of Experience Gregory M. Nixon 234-288 Myth and Mind: The Origin of Human Consciousness in the Discovery of the Sacred Gregory M. Nixon 289-337 ………………………………………………………………………………………………….. Commentary Brief Comment on Gregory Nixon’s Hollows of Experience: Derrida Frederick D. Abraham 338-341 Playing With Your Food: Review of “Hollows of Experience” by Greg Nixon William A. Adams 342-345 Brief Commentary on Nixon's Three Papers Roger Cook 346-347 Commentary on Nixon's From Panexperientialism to Individual Self Consciousness Stephen Deiss 348-349 Nixon on Conscious and Non-conscious Experience Gordon Globus 350-351 Commentary on Nixon's From Panexperientialism to Individual Self Consciousness Syamala Hari 352-353 The Predictive Mind and Mortal Knowledge Marc Hersch 354-368 Consciousness as Shared and Categorized Result of Experience Tim Jarvilehto 369-371 Brief Comment on Gregory Nixon’s Myth and Mind Joseph McCard 372-372 Commentary on Nixon's Three Papers Marty Monteiro 373-376 Brief Commentary on Nixon's “From Panexperientialism to Conscious Experience” Richard W Moodey 377-378 Hollows of a Science of Consciousness? Alfredo Pereira Jr. 379-380 Comment on Gregory Nixon’s “From Panexperientialism to Individual Self Consciousness” Steven M. Rosen 381-382 Consciousness, Non-conscious Experiences and Functions, Proto-experiences and Protofunctions, and Subjective Experiences Ram L. P. Vimal 383-389 ………………………………………………………………………………………………….. Response to Commentary Response to the Commentary of Frederick D. Abraham Gregory M. Nixon 390-390 Response to the Commentary of William A. Adams Gregory M. Nixon 391-392 Response to the Commentary of Syamala Hari Gregory M. Nixon 393-394 Response to the Commentary of Marc Hersch Gregory M. Nixon 395-398 Response to the Commentary of Joseph McCard Gregory M. Nixon 399-399 Response to the Commentary of Steven M. Rosen Gregory M. Nixon 400-40